/* SPDX-License-Identifier: GPL-2.0 */

#define _GNU_SOURCE
#define _LARGEFILE64_SOURCE

/* libc-specific include files
 * The program may be built in 3 ways:
 *   $(CC) -nostdlib -include /path/to/nolibc.h => NOLIBC already defined
 *   $(CC) -nostdlib -I/path/to/nolibc/sysroot  => _NOLIBC_* guards are present
 *   $(CC) with default libc                    => NOLIBC* never defined
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/auxv.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/ptrace.h>
#include <sys/random.h>
#include <sys/reboot.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/sysmacros.h>
#include <sys/time.h>
#include <sys/timerfd.h>
#include <sys/uio.h>
#include <sys/utsname.h>
#include <sys/wait.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <sched.h>
#include <signal.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdint.h>
#include <time.h>
#include <unistd.h>
#include <limits.h>
#include <ctype.h>

#pragma GCC diagnostic ignored "-Wmissing-prototypes"

#include "nolibc-test-linkage.h"

/* for the type of int_fast16_t and int_fast32_t, musl differs from glibc and nolibc */
#define SINT_MAX_OF_TYPE(type) (((type)1 << (sizeof(type) * 8 - 2)) - (type)1 + ((type)1 << (sizeof(type) * 8 - 2)))
#define SINT_MIN_OF_TYPE(type) (-SINT_MAX_OF_TYPE(type) - 1)

/* will be used to test initialization of environ */
static char **test_envp;

/* will be used to test initialization of argv */
static char **test_argv;

/* will be used to test initialization of argc */
static int test_argc;

/* will be used by some test cases as readable file, please don't write it */
static const char *argv0;

/* will be used by constructor tests */
static int constructor_test_value;

static const int is_nolibc =
#ifdef NOLIBC
        1
#else
        0
#endif
;

/* definition of a series of tests */
struct test {
        const char *name;              /* test name */
        int (*func)(int min, int max); /* handler */
};

#ifndef _NOLIBC_STDLIB_H
char *itoa(int i)
{
        static char buf[12];
        int ret;

        ret = snprintf(buf, sizeof(buf), "%d", i);
        return (ret >= 0 && ret < sizeof(buf)) ? buf : "#err";
}
#endif

#define CASE_ERR(err) \
        case err: return #err

/* returns the error name (e.g. "ENOENT") for common errors, "SUCCESS" for 0,
 * or the decimal value for less common ones.
 */
static const char *errorname(int err)
{
        switch (err) {
        case 0: return "SUCCESS";
        CASE_ERR(EPERM);
        CASE_ERR(ENOENT);
        CASE_ERR(ESRCH);
        CASE_ERR(EINTR);
        CASE_ERR(EIO);
        CASE_ERR(ENXIO);
        CASE_ERR(E2BIG);
        CASE_ERR(ENOEXEC);
        CASE_ERR(EBADF);
        CASE_ERR(ECHILD);
        CASE_ERR(EAGAIN);
        CASE_ERR(ENOMEM);
        CASE_ERR(EACCES);
        CASE_ERR(EFAULT);
        CASE_ERR(ENOTBLK);
        CASE_ERR(EBUSY);
        CASE_ERR(EEXIST);
        CASE_ERR(EXDEV);
        CASE_ERR(ENODEV);
        CASE_ERR(ENOTDIR);
        CASE_ERR(EISDIR);
        CASE_ERR(EINVAL);
        CASE_ERR(ENFILE);
        CASE_ERR(EMFILE);
        CASE_ERR(ENOTTY);
        CASE_ERR(ETXTBSY);
        CASE_ERR(EFBIG);
        CASE_ERR(ENOSPC);
        CASE_ERR(ESPIPE);
        CASE_ERR(EROFS);
        CASE_ERR(EMLINK);
        CASE_ERR(EPIPE);
        CASE_ERR(EDOM);
        CASE_ERR(ERANGE);
        CASE_ERR(ENOSYS);
        CASE_ERR(EOVERFLOW);
        default:
                return itoa(err);
        }
}

static void align_result(size_t llen)
{
        const size_t align = 64;
        char buf[align];
        size_t n;

        if (llen >= align)
                return;

        n = align - llen;
        memset(buf, ' ', n);
        buf[n] = '\0';
        fputs(buf, stdout);
}

enum RESULT {
        OK,
        FAIL,
        SKIPPED,
};

static void result(int llen, enum RESULT r)
{
        const char *msg;

        if (r == OK)
                msg = "  [OK]";
        else if (r == SKIPPED)
                msg = "[SKIPPED]";
        else
                msg = " [FAIL]";

        align_result(llen);
        puts(msg);
}

/* The tests below are intended to be used by the macroes, which evaluate
 * expression <expr>, print the status to stdout, and update the "ret"
 * variable to count failures. The functions themselves return the number
 * of failures, thus either 0 or 1.
 */

#define EXPECT_ZR(cond, expr)                           \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_zr(expr, llen); } while (0)

static __attribute__((unused))
int expect_zr(int expr, int llen)
{
        int ret = !(expr == 0);

        llen += printf(" = %d ", expr);
        result(llen, ret ? FAIL : OK);
        return ret;
}


#define EXPECT_NZ(cond, expr)                           \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_nz(expr, llen); } while (0)

static __attribute__((unused))
int expect_nz(int expr, int llen)
{
        int ret = !(expr != 0);

        llen += printf(" = %d ", expr);
        result(llen, ret ? FAIL : OK);
        return ret;
}


#define EXPECT_EQ(cond, expr, val)                              \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_eq(expr, llen, val); } while (0)

static __attribute__((unused))
int expect_eq(uint64_t expr, int llen, uint64_t val)
{
        int ret = !(expr == val);

        llen += printf(" = %lld ", (long long)expr);
        result(llen, ret ? FAIL : OK);
        return ret;
}


#define EXPECT_NE(cond, expr, val)                              \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_ne(expr, llen, val); } while (0)

static __attribute__((unused))
int expect_ne(int expr, int llen, int val)
{
        int ret = !(expr != val);

        llen += printf(" = %d ", expr);
        result(llen, ret ? FAIL : OK);
        return ret;
}


#define EXPECT_GE(cond, expr, val)                              \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_ge(expr, llen, val); } while (0)

static __attribute__((unused))
int expect_ge(int expr, int llen, int val)
{
        int ret = !(expr >= val);

        llen += printf(" = %d ", expr);
        result(llen, ret ? FAIL : OK);
        return ret;
}


#define EXPECT_GT(cond, expr, val)                              \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_gt(expr, llen, val); } while (0)

static __attribute__((unused))
int expect_gt(int expr, int llen, int val)
{
        int ret = !(expr > val);

        llen += printf(" = %d ", expr);
        result(llen, ret ? FAIL : OK);
        return ret;
}


#define EXPECT_LE(cond, expr, val)                              \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_le(expr, llen, val); } while (0)

static __attribute__((unused))
int expect_le(int expr, int llen, int val)
{
        int ret = !(expr <= val);

        llen += printf(" = %d ", expr);
        result(llen, ret ? FAIL : OK);
        return ret;
}


#define EXPECT_LT(cond, expr, val)                              \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_lt(expr, llen, val); } while (0)

static __attribute__((unused))
int expect_lt(int expr, int llen, int val)
{
        int ret = !(expr < val);

        llen += printf(" = %d ", expr);
        result(llen, ret ? FAIL : OK);
        return ret;
}


#define EXPECT_SYSZR(cond, expr)                                \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_syszr(expr, llen); } while (0)

static __attribute__((unused))
int expect_syszr(int expr, int llen)
{
        int ret = 0;

        if (errno == ENOSYS) {
                llen += printf(" = ENOSYS");
                result(llen, SKIPPED);
        } else if (expr) {
                ret = 1;
                llen += printf(" = %d %s ", expr, errorname(errno));
                result(llen, FAIL);
        } else {
                llen += printf(" = %d ", expr);
                result(llen, OK);
        }
        return ret;
}


#define EXPECT_SYSEQ(cond, expr, val)                           \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_syseq(expr, llen, val); } while (0)

static __attribute__((unused))
int expect_syseq(int expr, int llen, int val)
{
        int ret = 0;

        if (expr != val) {
                ret = 1;
                llen += printf(" = %d %s ", expr, errorname(errno));
                result(llen, FAIL);
        } else {
                llen += printf(" = %d ", expr);
                result(llen, OK);
        }
        return ret;
}


#define EXPECT_SYSNE(cond, expr, val)                           \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_sysne(expr, llen, val); } while (0)

static __attribute__((unused))
int expect_sysne(int expr, int llen, int val)
{
        int ret = 0;

        if (errno == ENOSYS) {
                llen += printf(" = ENOSYS");
                result(llen, SKIPPED);
        } else if (expr == val) {
                ret = 1;
                llen += printf(" = %d %s ", expr, errorname(errno));
                result(llen, FAIL);
        } else {
                llen += printf(" = %d ", expr);
                result(llen, OK);
        }
        return ret;
}


#define EXPECT_SYSER2(cond, expr, expret, experr1, experr2)             \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_syserr2(expr, expret, experr1, experr2, llen); } while (0)

#define EXPECT_SYSER(cond, expr, expret, experr)                        \
        EXPECT_SYSER2(cond, expr, expret, experr, 0)

static __attribute__((unused))
int expect_syserr2(int expr, int expret, int experr1, int experr2, int llen)
{
        int ret = 0;
        int _errno = errno;

        llen += printf(" = %d %s ", expr, errorname(_errno));
        if (errno == ENOSYS) {
                result(llen, SKIPPED);
        } else if (expr != expret || (_errno != experr1 && _errno != experr2)) {
                ret = 1;
                if (experr2 == 0)
                        llen += printf(" != (%d %s) ", expret, errorname(experr1));
                else
                        llen += printf(" != (%d %s %s) ", expret, errorname(experr1), errorname(experr2));
                result(llen, FAIL);
        } else {
                result(llen, OK);
        }
        return ret;
}


#define EXPECT_PTRZR(cond, expr)                                \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_ptrzr(expr, llen); } while (0)

static __attribute__((unused))
int expect_ptrzr(const void *expr, int llen)
{
        int ret = 0;

        llen += printf(" = <%p> ", expr);
        if (expr) {
                ret = 1;
                result(llen, FAIL);
        } else {
                result(llen, OK);
        }
        return ret;
}


#define EXPECT_PTRNZ(cond, expr)                                \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_ptrnz(expr, llen); } while (0)

static __attribute__((unused))
int expect_ptrnz(const void *expr, int llen)
{
        int ret = 0;

        llen += printf(" = <%p> ", expr);
        if (!expr) {
                ret = 1;
                result(llen, FAIL);
        } else {
                result(llen, OK);
        }
        return ret;
}

#define EXPECT_PTREQ(cond, expr, cmp)                           \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_ptreq(expr, llen, cmp); } while (0)

static __attribute__((unused))
int expect_ptreq(const void *expr, int llen, const void *cmp)
{
        int ret = 0;

        llen += printf(" = <%p> ", expr);
        if (expr != cmp) {
                ret = 1;
                result(llen, FAIL);
        } else {
                result(llen, OK);
        }
        return ret;
}

#define EXPECT_PTRNE(cond, expr, cmp)                           \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_ptrne(expr, llen, cmp); } while (0)

static __attribute__((unused))
int expect_ptrne(const void *expr, int llen, const void *cmp)
{
        int ret = 0;

        llen += printf(" = <%p> ", expr);
        if (expr == cmp) {
                ret = 1;
                result(llen, FAIL);
        } else {
                result(llen, OK);
        }
        return ret;
}

#define EXPECT_PTRGE(cond, expr, cmp)                           \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_ptrge(expr, llen, cmp); } while (0)

static __attribute__((unused))
int expect_ptrge(const void *expr, int llen, const void *cmp)
{
        int ret = !(expr >= cmp);

        llen += printf(" = <%p> ", expr);
        result(llen, ret ? FAIL : OK);
        return ret;
}

#define EXPECT_PTRGT(cond, expr, cmp)                           \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_ptrgt(expr, llen, cmp); } while (0)

static __attribute__((unused))
int expect_ptrgt(const void *expr, int llen, const void *cmp)
{
        int ret = !(expr > cmp);

        llen += printf(" = <%p> ", expr);
        result(llen, ret ? FAIL : OK);
        return ret;
}


#define EXPECT_PTRLE(cond, expr, cmp)                           \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_ptrle(expr, llen, cmp); } while (0)

static __attribute__((unused))
int expect_ptrle(const void *expr, int llen, const void *cmp)
{
        int ret = !(expr <= cmp);

        llen += printf(" = <%p> ", expr);
        result(llen, ret ? FAIL : OK);
        return ret;
}


#define EXPECT_PTRLT(cond, expr, cmp)                           \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_ptrlt(expr, llen, cmp); } while (0)

static __attribute__((unused))
int expect_ptrlt(const void *expr, int llen, const void *cmp)
{
        int ret = !(expr < cmp);

        llen += printf(" = <%p> ", expr);
        result(llen, ret ? FAIL : OK);
        return ret;
}

#define EXPECT_PTRER2(cond, expr, expret, experr1, experr2)             \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_ptrerr2(expr, expret, experr1, experr2, llen); } while (0)

#define EXPECT_PTRER(cond, expr, expret, experr)                        \
        EXPECT_PTRER2(cond, expr, expret, experr, 0)

static __attribute__((unused))
int expect_ptrerr2(const void *expr, const void *expret, int experr1, int experr2, int llen)
{
        int ret = 0;
        int _errno = errno;

        llen += printf(" = <%p> %s ", expr, errorname(_errno));
        if (expr != expret || (_errno != experr1 && _errno != experr2)) {
                ret = 1;
                if (experr2 == 0)
                        llen += printf(" != (<%p> %s) ", expret, errorname(experr1));
                else
                        llen += printf(" != (<%p> %s %s) ", expret, errorname(experr1), errorname(experr2));
                result(llen, FAIL);
        } else {
                result(llen, OK);
        }
        return ret;
}

#define EXPECT_STRZR(cond, expr)                                \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_strzr(expr, llen); } while (0)

static __attribute__((unused))
int expect_strzr(const char *expr, int llen)
{
        int ret = 0;

        llen += printf(" = <%s> ", expr ? expr : "(null)");
        if (expr) {
                ret = 1;
                result(llen, FAIL);
        } else {
                result(llen, OK);
        }
        return ret;
}


#define EXPECT_STRNZ(cond, expr)                                \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_strnz(expr, llen); } while (0)

static __attribute__((unused))
int expect_strnz(const char *expr, int llen)
{
        int ret = 0;

        llen += printf(" = <%s> ", expr ? expr : "(null)");
        if (!expr) {
                ret = 1;
                result(llen, FAIL);
        } else {
                result(llen, OK);
        }
        return ret;
}


#define EXPECT_STREQ(cond, expr, cmp)                           \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_streq(expr, llen, cmp); } while (0)

static __attribute__((unused))
int expect_streq(const char *expr, int llen, const char *cmp)
{
        int ret = 0;

        llen += printf(" = <%s> ", expr);
        if (strcmp(expr, cmp) != 0) {
                ret = 1;
                result(llen, FAIL);
        } else {
                result(llen, OK);
        }
        return ret;
}


#define EXPECT_STRNE(cond, expr, cmp)                           \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_strne(expr, llen, cmp); } while (0)

static __attribute__((unused))
int expect_strne(const char *expr, int llen, const char *cmp)
{
        int ret = 0;

        llen += printf(" = <%s> ", expr);
        if (strcmp(expr, cmp) == 0) {
                ret = 1;
                result(llen, FAIL);
        } else {
                result(llen, OK);
        }
        return ret;
}

#define EXPECT_STRBUFEQ(cond, expr, buf, val, cmp)                              \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_str_buf_eq(expr, buf, val, llen, cmp); } while (0)

static __attribute__((unused))
int expect_str_buf_eq(size_t expr, const char *buf, size_t val, int llen, const char *cmp)
{
        llen += printf(" = %lu <%s> ", (unsigned long)expr, buf);
        if (strcmp(buf, cmp) != 0) {
                result(llen, FAIL);
                return 1;
        }
        if (expr != val) {
                result(llen, FAIL);
                return 1;
        }

        result(llen, OK);
        return 0;
}

#define EXPECT_STRTOX(cond, func, input, base, expected, chars, expected_errno)                         \
        do { if (!(cond)) result(llen, SKIPPED); else ret += expect_strtox(llen, func, input, base, expected, chars, expected_errno); } while (0)

static __attribute__((unused))
int expect_strtox(int llen, void *func, const char *input, int base, intmax_t expected, int expected_chars, int expected_errno)
{
        char *endptr;
        int actual_errno, actual_chars;
        intmax_t r;

        errno = 0;
        if (func == strtol) {
                r = strtol(input, &endptr, base);
        } else if (func == strtoul) {
                r = strtoul(input, &endptr, base);
        } else {
                result(llen, FAIL);
                return 1;
        }
        actual_errno = errno;
        actual_chars = endptr - input;

        llen += printf(" %lld = %lld", (long long)expected, (long long)r);
        if (r != expected) {
                result(llen, FAIL);
                return 1;
        }
        if (expected_chars == -1) {
                if (*endptr != '\0') {
                        result(llen, FAIL);
                        return 1;
                }
        } else if (expected_chars != actual_chars) {
                result(llen, FAIL);
                return 1;
        }
        if (actual_errno != expected_errno) {
                result(llen, FAIL);
                return 1;
        }

        result(llen, OK);
        return 0;
}

/* declare tests based on line numbers. There must be exactly one test per line. */
#define CASE_TEST(name) \
        case __LINE__: llen += printf("%d %s", test, #name);

__attribute__((constructor))
static void constructor1(void)
{
        constructor_test_value |= 1 << 0;
}

__attribute__((constructor))
static void constructor2(int argc, char **argv, char **envp)
{
        if (argc && argv && envp)
                constructor_test_value |= 1 << 1;
}

int run_startup(int min, int max)
{
        int test;
        int ret = 0;
        /* kernel at least passes HOME and TERM, shell passes more */
        int env_total = 2;
        /* checking NULL for argv/argv0, environ and _auxv is not enough, let's compare with sbrk(0) or &end */
        extern char end;
        char *brk = sbrk(0) != (void *)-1 ? sbrk(0) : &end;
        /* differ from nolibc, both glibc and musl have no global _auxv */
        const unsigned long *test_auxv = (void *)-1;
#ifdef NOLIBC
        test_auxv = _auxv;
#endif

        for (test = min; test >= 0 && test <= max; test++) {
                int llen = 0; /* line length */

                /* avoid leaving empty lines below, this will insert holes into
                 * test numbers.
                 */
                switch (test + __LINE__ + 1) {
                CASE_TEST(argc);             EXPECT_GE(1, test_argc, 1); break;
                CASE_TEST(argv_addr);        EXPECT_PTRGT(1, test_argv, brk); break;
                CASE_TEST(argv_environ);     EXPECT_PTRLT(1, test_argv, environ); break;
                CASE_TEST(argv_total);       EXPECT_EQ(1, environ - test_argv - 1, test_argc ?: 1); break;
                CASE_TEST(argv0_addr);       EXPECT_PTRGT(1, argv0, brk); break;
                CASE_TEST(argv0_str);        EXPECT_STRNZ(1, argv0 > brk ? argv0 : NULL); break;
                CASE_TEST(argv0_len);        EXPECT_GE(1,  argv0 > brk ? strlen(argv0) : 0, 1); break;
                CASE_TEST(environ_addr);     EXPECT_PTRGT(1, environ, brk); break;
                CASE_TEST(environ_envp);     EXPECT_PTREQ(1, environ, test_envp); break;
                CASE_TEST(environ_auxv);     EXPECT_PTRLT(test_auxv != (void *)-1, environ, test_auxv); break;
                CASE_TEST(environ_total);    EXPECT_GE(test_auxv != (void *)-1, (void *)test_auxv - (void *)environ - 1, env_total); break;
                CASE_TEST(environ_HOME);     EXPECT_PTRNZ(1, getenv("HOME")); break;
                CASE_TEST(auxv_addr);        EXPECT_PTRGT(test_auxv != (void *)-1, test_auxv, brk); break;
                CASE_TEST(auxv_AT_UID);      EXPECT_EQ(1, getauxval(AT_UID), getuid()); break;
                CASE_TEST(constructor);      EXPECT_EQ(is_nolibc, constructor_test_value, 0x3); break;
                CASE_TEST(linkage_errno);    EXPECT_PTREQ(1, linkage_test_errno_addr(), &errno); break;
                CASE_TEST(linkage_constr);   EXPECT_EQ(1, linkage_test_constructor_test_value, 0x3); break;
                case __LINE__:
                        return ret; /* must be last */
                /* note: do not set any defaults so as to permit holes above */
                }
        }
        return ret;
}


/* used by some syscall tests below */
int test_getdents64(const char *dir)
{
        char buffer[4096];
        int fd, ret;
        int err;

        ret = fd = open(dir, O_RDONLY | O_DIRECTORY, 0);
        if (ret < 0)
                return ret;

        ret = getdents64(fd, (void *)buffer, sizeof(buffer));
        err = errno;
        close(fd);

        errno = err;
        return ret;
}

static int test_dirent(void)
{
        int comm = 0, cmdline = 0;
        struct dirent dirent, *result;
        DIR *dir;
        int ret;

        dir = opendir("/proc/self");
        if (!dir)
                return 1;

        while (1) {
                errno = 0;
                ret = readdir_r(dir, &dirent, &result);
                if (ret != 0)
                        return 1;
                if (!result)
                        break;

                if (strcmp(dirent.d_name, "comm") == 0)
                        comm++;
                else if (strcmp(dirent.d_name, "cmdline") == 0)
                        cmdline++;
        }

        if (errno)
                return 1;

        ret = closedir(dir);
        if (ret)
                return 1;

        if (comm != 1 || cmdline != 1)
                return 1;

        return 0;
}

int test_getrandom(void)
{
        uint64_t rng = 0;
        ssize_t ret;

        ret = getrandom(&rng, sizeof(rng), GRND_NONBLOCK);
        if (ret == -1 && errno == EAGAIN)
                return 0; /* No entropy available yet */

        if (ret != sizeof(rng))
                return ret;

        if (!rng) {
                errno = EINVAL;
                return -1;
        }

        return 0;
}

int test_getpagesize(void)
{
        int x = getpagesize();
        int c;

        if (x < 0)
                return x;

#if defined(__x86_64__) || defined(__i386__) || defined(__i486__) || defined(__i586__) || defined(__i686__)
        /*
         * x86 family is always 4K page.
         */
        c = (x == 4096);
#elif defined(__aarch64__)
        /*
         * Linux aarch64 supports three values of page size: 4K, 16K, and 64K
         * which are selected at kernel compilation time.
         */
        c = (x == 4096 || x == (16 * 1024) || x == (64 * 1024));
#else
        /*
         * Assuming other architectures must have at least 4K page.
         */
        c = (x >= 4096);
#endif

        return !c;
}

int test_file_stream(void)
{
        FILE *f;
        int r;

        f = fopen("/dev/null", "r");
        if (!f)
                return -1;

        errno = 0;
        r = fwrite("foo", 1, 3, f);
        if (r != 0 || errno != EBADF) {
                fclose(f);
                return -1;
        }

        r = fclose(f);
        if (r == EOF)
                return -1;

        return 0;
}

int test_file_stream_wsr(void)
{
        const char dataout[] = "foo";
        const size_t datasz = sizeof(dataout);
        char datain[datasz];
        int fd, r;
        FILE *f;

        fd = open("/tmp", O_TMPFILE | O_RDWR, 0644);
        if (fd == -1)
                return -1;

        f = fdopen(fd, "w+");
        if (!f)
                return -1;

        errno = 0;
        r = fwrite(dataout, 1, datasz, f);
        if (r != datasz)
                return -1;

        /* Attempt to read from the file without rewinding,
         * we should read 0 items.
         */
        r = fread(datain, 1, datasz, f);
        if (r)
                return -1;

        /* Rewind the file to the start */
        r = fseek(f, 0, SEEK_SET);
        if (r)
                return -1;

        /* Attempt to read back more than was written to
         * make sure we handle short reads properly.
         * fread() should return the number of complete items.
         */
        r = fread(datain, 1, datasz + 1, f);
        if (r != datasz)
                return -1;

        /* Data we read should match the data we just wrote */
        if (memcmp(datain, dataout, datasz) != 0)
                return -1;

        r = fclose(f);
        if (r)
                return -1;

        return 0;
}

enum fork_type {
        FORK_STANDARD,
        FORK_VFORK,
};

int test_fork(enum fork_type type)
{
        int status;
        pid_t pid;

        /* flush the printf buffer to avoid child flush it */
        fflush(stdout);
        fflush(stderr);

        switch (type) {
        case FORK_STANDARD:
                pid = fork();
                break;
        case FORK_VFORK:
                pid = vfork();
                break;
        default:
                return 1;
        }

        switch (pid) {
        case -1:
                return 1;

        case 0:
                _exit(123);

        default:
                pid = waitpid(pid, &status, 0);

                return pid == -1 || !WIFEXITED(status) || WEXITSTATUS(status) != 123;
        }
}

int test_stat_timestamps(void)
{
        struct stat st;

        if (sizeof(st.st_atim.tv_sec) != sizeof(st.st_atime))
                return 1;

        if (stat("/proc/self/", &st) && stat(argv0, &st) && stat("/", &st))
                return 1;

        if (st.st_atim.tv_sec != st.st_atime || st.st_atim.tv_nsec > 1000000000)
                return 1;

        if (st.st_mtim.tv_sec != st.st_mtime || st.st_mtim.tv_nsec > 1000000000)
                return 1;

        if (st.st_ctim.tv_sec != st.st_ctime || st.st_ctim.tv_nsec > 1000000000)
                return 1;

        return 0;
}

int test_timer(void)
{
        struct itimerspec timerspec;
        struct sigevent evp;
        timer_t timer;
        int ret;

        evp.sigev_notify = SIGEV_NONE;

        ret = timer_create(CLOCK_MONOTONIC, &evp, &timer);
        if (ret)
                return ret;

        timerspec = (struct itimerspec) {
                .it_value.tv_sec = 1000000,
        };
        ret = timer_settime(timer, 0, &timerspec, NULL);
        if (ret)
                goto err;

        timerspec = (struct itimerspec) {
                .it_value.tv_sec = -1,
                .it_value.tv_nsec = -1,
                .it_interval.tv_sec = -1,
                .it_interval.tv_nsec = -1,
        };
        ret = timer_gettime(timer, &timerspec);
        if (ret)
                goto err;

        errno = EINVAL;
        ret = -1;

        if (timerspec.it_interval.tv_sec || timerspec.it_interval.tv_nsec)
                goto err;

        if (timerspec.it_value.tv_sec > 1000000)
                goto err;

        ret = timer_delete(timer);
        if (ret)
                return ret;

        return 0;

err:
        timer_delete(timer);
        return ret;
}

int test_timerfd(void)
{
        struct itimerspec timerspec;
        int timer, ret;

        timer = timerfd_create(CLOCK_MONOTONIC, 0);
        if (timer == -1)
                return -1;

        timerspec = (struct itimerspec) {
                .it_value.tv_sec = 1000000,
        };
        ret = timerfd_settime(timer, 0, &timerspec, NULL);
        if (ret)
                goto err;

        timerspec = (struct itimerspec) {
                .it_value.tv_sec = -1,
                .it_value.tv_nsec = -1,
                .it_interval.tv_sec = -1,
                .it_interval.tv_nsec = -1,
        };
        ret = timerfd_gettime(timer, &timerspec);
        if (ret)
                goto err;

        errno = EINVAL;
        ret = -1;

        if (timerspec.it_interval.tv_sec || timerspec.it_interval.tv_nsec)
                goto err;

        if (timerspec.it_value.tv_sec > 1000000)
                goto err;

        ret = close(timer);
        if (ret)
                return ret;

        return 0;

err:
        close(timer);
        return ret;
}

int test_uname(void)
{
        struct utsname buf;
        char osrelease[sizeof(buf.release)];
        ssize_t r;
        int fd;

        memset(&buf.domainname, 'P', sizeof(buf.domainname));

        if (uname(&buf))
                return 1;

        if (strncmp("Linux", buf.sysname, sizeof(buf.sysname)))
                return 1;

        fd = open("/proc/sys/kernel/osrelease", O_RDONLY);
        if (fd == -1)
                return 1;

        r = read(fd, osrelease, sizeof(osrelease));
        if (r == -1)
                return 1;

        close(fd);

        if (osrelease[r - 1] == '\n')
                r--;

        /* Validate one of the later fields to ensure field sizes are correct */
        if (strncmp(osrelease, buf.release, r))
                return 1;

        /* Ensure the field domainname is set, it is missing from struct old_utsname */
        if (strnlen(buf.domainname, sizeof(buf.domainname)) == sizeof(buf.domainname))
                return 1;

        return 0;
}

int test_mmap_munmap(void)
{
        int ret, fd, i, page_size;
        void *mem;
        size_t file_size, length, mem_length;
        off_t offset, pa_offset;
        struct stat stat_buf;
        const char * const files[] = {
                "/dev/zero",
                "/proc/1/exe", "/proc/self/exe",
                argv0,
                NULL
        };

        page_size = getpagesize();
        if (page_size < 0)
                return 1;

        /* find a right file to mmap, existed and accessible */
        for (i = 0; files[i] != NULL; i++) {
                ret = fd = open(files[i], O_RDONLY);
                if (ret == -1)
                        continue;
                else
                        break;
        }
        if (ret == -1)
                return 1;

        ret = stat(files[i], &stat_buf);
        if (ret == -1)
                goto end;

        /* file size of the special /dev/zero is 0, let's assign one manually */
        if (i == 0)
                file_size = 3*page_size;
        else
                file_size = stat_buf.st_size;

        offset = file_size - 1;
        if (offset < 0)
                offset = 0;
        length = file_size - offset;
        pa_offset = offset & ~(page_size - 1);
        mem_length = length + offset - pa_offset;

        mem = mmap(NULL, mem_length, PROT_READ, MAP_SHARED, fd, pa_offset);
        if (mem == MAP_FAILED) {
                ret = 1;
                goto end;
        }

        mem = mremap(mem, mem_length, mem_length * 2, MREMAP_MAYMOVE, 0);
        if (mem == MAP_FAILED) {
                munmap(mem, mem_length);
                ret = 1;
                goto end;
        }

        ret = munmap(mem, mem_length * 2);

end:
        close(fd);
        return !!ret;
}

int test_pipe(void)
{
        const char *const msg = "hello, nolibc";
        int pipefd[2];
        char buf[32];
        size_t len;

        if (pipe(pipefd) == -1)
                return 1;

        write(pipefd[1], msg, strlen(msg));
        close(pipefd[1]);
        len = read(pipefd[0], buf, sizeof(buf));
        close(pipefd[0]);

        if (len != strlen(msg))
                return 1;

        return !!memcmp(buf, msg, len);
}

int test_rlimit(void)
{
        struct rlimit rlim = {
                .rlim_cur = 1 << 20,
                .rlim_max = 1 << 21,
        };
        int ret;

        ret = setrlimit(RLIMIT_CORE, &rlim);
        if (ret)
                return -1;

        rlim.rlim_cur = 0;
        rlim.rlim_max = 0;

        ret = getrlimit(RLIMIT_CORE, &rlim);
        if (ret)
                return -1;

        if (rlim.rlim_cur != 1 << 20)
                return -1;
        if (rlim.rlim_max != 1 << 21)
                return -1;

        return 0;
}

int test_openat(void)
{
        int dev, null;

        dev = openat(AT_FDCWD, "/dev", O_DIRECTORY);
        if (dev < 0)
                return -1;

        null = openat(dev, "null", O_RDONLY);
        close(dev);
        if (null < 0)
                return -1;

        close(null);
        return 0;
}

int test_namespace(void)
{
        int original_ns, new_ns, ret;
        ino_t original_ns_ino;
        struct stat stat_buf;

        original_ns = open("/proc/self/ns/uts", O_RDONLY);
        if (original_ns == -1)
                return -1;

        ret = fstat(original_ns, &stat_buf);
        if (ret)
                goto out;

        original_ns_ino = stat_buf.st_ino;

        ret = unshare(CLONE_NEWUTS);
        if (ret)
                goto out;

        new_ns = open("/proc/self/ns/uts", O_RDONLY);
        if (new_ns == -1) {
                ret = new_ns;
                goto out;
        }

        ret = fstat(new_ns, &stat_buf);
        close(new_ns);
        if (ret)
                goto out;

        if (stat_buf.st_ino == original_ns_ino) {
                errno = EINVAL;
                ret = -1;
                goto out;
        }

        ret = setns(original_ns, CLONE_NEWUTS);
        if (ret)
                goto out;

        new_ns = open("/proc/self/ns/uts", O_RDONLY);
        if (new_ns == -1) {
                ret = new_ns;
                goto out;
        }

        ret = fstat(new_ns, &stat_buf);
        if (ret)
                goto out;

        close(new_ns);

        if (stat_buf.st_ino != original_ns_ino) {
                errno = EINVAL;
                ret = -1;
                goto out;
        }

        ret = 0;

out:
        close(original_ns);
        return ret;
}

/* Run syscall tests between IDs <min> and <max>.
 * Return 0 on success, non-zero on failure.
 */
int run_syscall(int min, int max)
{
        struct timeval tv;
        struct timezone tz;
        struct timespec ts;
        struct stat stat_buf;
        int euid0;
        int proc;
        int test;
        int tmp;
        struct iovec iov_one = {
                .iov_base = &tmp,
                .iov_len = 1,
        };
        int ret = 0;
        void *p1, *p2;
        int has_gettid = 1;
        int has_brk;

        /* <proc> indicates whether or not /proc is mounted */
        proc = stat("/proc", &stat_buf) == 0;

        /* this will be used to skip certain tests that can't be run unprivileged */
        euid0 = geteuid() == 0;

        /* from 2.30, glibc provides gettid() */
#if defined(__GLIBC_MINOR__) && defined(__GLIBC__)
        has_gettid = __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 30);
#endif

        /* on musl setting brk()/sbrk() always fails */
        has_brk = brk(0) == 0;

        for (test = min; test >= 0 && test <= max; test++) {
                int llen = 0; /* line length */

                /* avoid leaving empty lines below, this will insert holes into
                 * test numbers.
                 */
                switch (test + __LINE__ + 1) {
                CASE_TEST(access);            EXPECT_SYSZR(proc, access("/proc/self", R_OK)); break;
                CASE_TEST(access_bad);        EXPECT_SYSER(proc, access("/proc/self", W_OK), -1, EPERM); break;
                CASE_TEST(clock_getres);      EXPECT_SYSZR(1, clock_getres(CLOCK_MONOTONIC, &ts)); break;
                CASE_TEST(clock_gettime);     EXPECT_SYSZR(1, clock_gettime(CLOCK_MONOTONIC, &ts)); break;
                CASE_TEST(clock_settime);     EXPECT_SYSER(1, clock_settime(CLOCK_MONOTONIC, &ts), -1, EINVAL); break;
                CASE_TEST(getpid);            EXPECT_SYSNE(1, getpid(), -1); break;
                CASE_TEST(getppid);           EXPECT_SYSNE(1, getppid(), -1); break;
                CASE_TEST(gettid);            EXPECT_SYSNE(has_gettid, gettid(), -1); break;
                CASE_TEST(getpgid_self);      EXPECT_SYSNE(1, getpgid(0), -1); break;
                CASE_TEST(getpgid_bad);       EXPECT_SYSER(1, getpgid(-1), -1, ESRCH); break;
                CASE_TEST(kill_0);            EXPECT_SYSZR(1, kill(getpid(), 0)); break;
                CASE_TEST(kill_CONT);         EXPECT_SYSZR(1, kill(getpid(), 0)); break;
                CASE_TEST(kill_BADPID);       EXPECT_SYSER(1, kill(INT_MAX, 0), -1, ESRCH); break;
                CASE_TEST(sbrk_0);            EXPECT_PTRNE(has_brk, sbrk(0), (void *)-1); break;
                CASE_TEST(sbrk);              if ((p1 = p2 = sbrk(4096)) != (void *)-1) p2 = sbrk(-4096); EXPECT_SYSZR(has_brk, (p2 == (void *)-1) || p2 == p1); break;
                CASE_TEST(brk);               EXPECT_SYSZR(has_brk, brk(sbrk(0))); break;
                CASE_TEST(chdir_root);        EXPECT_SYSZR(1, chdir("/")); chdir(getenv("PWD")); break;
                CASE_TEST(chdir_dot);         EXPECT_SYSZR(1, chdir(".")); break;
                CASE_TEST(chdir_blah);        EXPECT_SYSER(1, chdir("/blah"), -1, ENOENT); break;
                CASE_TEST(chmod_argv0);       EXPECT_SYSZR(1, chmod(argv0, 0555)); break;
                CASE_TEST(chmod_self);        EXPECT_SYSER(proc, chmod("/proc/self", 0555), -1, EPERM); break;
                CASE_TEST(chown_self);        EXPECT_SYSER(proc, chown("/proc/self", 0, 0), -1, EPERM); break;
                CASE_TEST(chroot_root);       EXPECT_SYSZR(euid0, chroot("/")); break;
                CASE_TEST(chroot_blah);       EXPECT_SYSER(1, chroot("/proc/self/blah"), -1, ENOENT); break;
                CASE_TEST(chroot_exe);        EXPECT_SYSER(1, chroot(argv0), -1, ENOTDIR); break;
                CASE_TEST(clock_nanosleep);   ts.tv_nsec = -1; EXPECT_EQ(1, EINVAL, clock_nanosleep(CLOCK_REALTIME, 0, &ts, NULL)); break;
                CASE_TEST(close_m1);          EXPECT_SYSER(1, close(-1), -1, EBADF); break;
                CASE_TEST(close_dup);         EXPECT_SYSZR(1, close(dup(0))); break;
                CASE_TEST(dup_0);             tmp = dup(0);  EXPECT_SYSNE(1, tmp, -1); close(tmp); break;
                CASE_TEST(dup_m1);            tmp = dup(-1); EXPECT_SYSER(1, tmp, -1, EBADF); if (tmp != -1) close(tmp); break;
                CASE_TEST(dup2_0);            tmp = dup2(0, 100);  EXPECT_SYSNE(1, tmp, -1); close(tmp); break;
                CASE_TEST(dup2_m1);           tmp = dup2(-1, 100); EXPECT_SYSER(1, tmp, -1, EBADF); if (tmp != -1) close(tmp); break;
                CASE_TEST(dup3_0);            tmp = dup3(0, 100, 0);  EXPECT_SYSNE(1, tmp, -1); close(tmp); break;
                CASE_TEST(dup3_m1);           tmp = dup3(-1, 100, 0); EXPECT_SYSER(1, tmp, -1, EBADF); if (tmp != -1) close(tmp); break;
                CASE_TEST(execve_root);       EXPECT_SYSER(1, execve("/", (char*[]){ [0] = "/", [1] = NULL }, NULL), -1, EACCES); break;
                CASE_TEST(fchdir_stdin);      EXPECT_SYSER(1, fchdir(STDIN_FILENO), -1, ENOTDIR); break;
                CASE_TEST(fchdir_badfd);      EXPECT_SYSER(1, fchdir(-1), -1, EBADF); break;
                CASE_TEST(file_stream);       EXPECT_SYSZR(1, test_file_stream()); break;
                CASE_TEST(file_stream_wsr);   EXPECT_SYSZR(1, test_file_stream_wsr()); break;
                CASE_TEST(fork);              EXPECT_SYSZR(1, test_fork(FORK_STANDARD)); break;
                CASE_TEST(getdents64_root);   EXPECT_SYSNE(1, test_getdents64("/"), -1); break;
                CASE_TEST(getdents64_null);   EXPECT_SYSER(1, test_getdents64("/dev/null"), -1, ENOTDIR); break;
                CASE_TEST(directories);       EXPECT_SYSZR(proc, test_dirent()); break;
                CASE_TEST(getrandom);         EXPECT_SYSZR(1, test_getrandom()); break;
                CASE_TEST(gettimeofday_tv);   EXPECT_SYSZR(1, gettimeofday(&tv, NULL)); break;
                CASE_TEST(gettimeofday_tv_tz);EXPECT_SYSZR(1, gettimeofday(&tv, &tz)); break;
                CASE_TEST(getpagesize);       EXPECT_SYSZR(1, test_getpagesize()); break;
                CASE_TEST(ioctl_tiocinq);     EXPECT_SYSZR(1, ioctl(0, TIOCINQ, &tmp)); break;
                CASE_TEST(link_root1);        EXPECT_SYSER(1, link("/", "/"), -1, EEXIST); break;
                CASE_TEST(link_blah);         EXPECT_SYSER(1, link("/proc/self/blah", "/blah"), -1, ENOENT); break;
                CASE_TEST(link_dir);          EXPECT_SYSER(euid0, link("/", "/blah"), -1, EPERM); break;
                CASE_TEST(link_cross);        EXPECT_SYSER(proc, link("/proc/self/cmdline", "/blah"), -1, EXDEV); break;
                CASE_TEST(lseek_m1);          EXPECT_SYSER(1, lseek(-1, 0, SEEK_SET), -1, EBADF); break;
                CASE_TEST(lseek_0);           EXPECT_SYSER(1, lseek(0, 0, SEEK_SET), -1, ESPIPE); break;
                CASE_TEST(mkdir_root);        EXPECT_SYSER(1, mkdir("/", 0755), -1, EEXIST); break;
                CASE_TEST(mmap_bad);          EXPECT_PTRER(1, mmap(NULL, 0, PROT_READ, MAP_PRIVATE, 0, 0), MAP_FAILED, EINVAL); break;
                CASE_TEST(munmap_bad);        EXPECT_SYSER(1, munmap(NULL, 0), -1, EINVAL); break;
                CASE_TEST(mmap_munmap_good);  EXPECT_SYSZR(1, test_mmap_munmap()); break;
                CASE_TEST(nanosleep);         ts.tv_nsec = -1; EXPECT_SYSER(1, nanosleep(&ts, NULL), -1, EINVAL); break;
                CASE_TEST(open_tty);          EXPECT_SYSNE(1, tmp = open("/dev/null", O_RDONLY), -1); if (tmp != -1) close(tmp); break;
                CASE_TEST(open_blah);         EXPECT_SYSER(1, tmp = open("/proc/self/blah", O_RDONLY), -1, ENOENT); if (tmp != -1) close(tmp); break;
                CASE_TEST(openat_dir);        EXPECT_SYSZR(1, test_openat()); break;
                CASE_TEST(pipe);              EXPECT_SYSZR(1, test_pipe()); break;
                CASE_TEST(poll_null);         EXPECT_SYSZR(1, poll(NULL, 0, 0)); break;
                CASE_TEST(poll_stdout);       EXPECT_SYSNE(1, ({ struct pollfd fds = { 1, POLLOUT, 0}; poll(&fds, 1, 0); }), -1); break;
                CASE_TEST(poll_fault);        EXPECT_SYSER(1, poll(NULL, 1, 0), -1, EFAULT); break;
                CASE_TEST(prctl);             EXPECT_SYSER(1, prctl(PR_SET_NAME, (unsigned long)NULL, 0, 0, 0), -1, EFAULT); break;
                CASE_TEST(read_badf);         EXPECT_SYSER(1, read(-1, &tmp, 1), -1, EBADF); break;
                CASE_TEST(rlimit);            EXPECT_SYSZR(1, test_rlimit()); break;
                CASE_TEST(rmdir_blah);        EXPECT_SYSER(1, rmdir("/blah"), -1, ENOENT); break;
                CASE_TEST(sched_yield);       EXPECT_SYSZR(1, sched_yield()); break;
                CASE_TEST(select_null);       EXPECT_SYSZR(1, ({ struct timeval tv = { 0 }; select(0, NULL, NULL, NULL, &tv); })); break;
                CASE_TEST(select_stdout);     EXPECT_SYSNE(1, ({ fd_set fds; FD_ZERO(&fds); FD_SET(1, &fds); select(2, NULL, &fds, NULL, NULL); }), -1); break;
                CASE_TEST(select_fault);      EXPECT_SYSER(1, select(1, (void *)1, NULL, NULL, 0), -1, EFAULT); break;
                CASE_TEST(stat_blah);         EXPECT_SYSER(1, stat("/proc/self/blah", &stat_buf), -1, ENOENT); break;
                CASE_TEST(stat_fault);        EXPECT_SYSER(1, stat(NULL, &stat_buf), -1, EFAULT); break;
                CASE_TEST(stat_timestamps);   EXPECT_SYSZR(1, test_stat_timestamps()); break;
                CASE_TEST(symlink_root);      EXPECT_SYSER(1, symlink("/", "/"), -1, EEXIST); break;
                CASE_TEST(timer);             EXPECT_SYSZR(1, test_timer()); break;
                CASE_TEST(timerfd);           EXPECT_SYSZR(1, test_timerfd()); break;
                CASE_TEST(uname);             EXPECT_SYSZR(proc, test_uname()); break;
                CASE_TEST(uname_fault);       EXPECT_SYSER(1, uname(NULL), -1, EFAULT); break;
                CASE_TEST(unlink_root);       EXPECT_SYSER(1, unlink("/"), -1, EISDIR); break;
                CASE_TEST(unlink_blah);       EXPECT_SYSER(1, unlink("/proc/self/blah"), -1, ENOENT); break;
                CASE_TEST(vfork);             EXPECT_SYSZR(1, test_fork(FORK_VFORK)); break;
                CASE_TEST(wait_child);        EXPECT_SYSER(1, wait(&tmp), -1, ECHILD); break;
                CASE_TEST(waitpid_min);       EXPECT_SYSER(1, waitpid(INT_MIN, &tmp, WNOHANG), -1, ESRCH); break;
                CASE_TEST(waitpid_child);     EXPECT_SYSER(1, waitpid(getpid(), &tmp, WNOHANG), -1, ECHILD); break;
                CASE_TEST(write_badf);        EXPECT_SYSER(1, write(-1, &tmp, 1), -1, EBADF); break;
                CASE_TEST(write_zero);        EXPECT_SYSZR(1, write(1, &tmp, 0)); break;
                CASE_TEST(readv_badf);        EXPECT_SYSER(1, readv(-1, &iov_one, 1), -1, EBADF); break;
                CASE_TEST(readv_zero);        EXPECT_SYSZR(1, readv(0, NULL, 0)); break;
                CASE_TEST(writev_badf);       EXPECT_SYSER(1, writev(-1, &iov_one, 1), -1, EBADF); break;
                CASE_TEST(writev_zero);       EXPECT_SYSZR(1, writev(1, NULL, 0)); break;
                CASE_TEST(ptrace);            EXPECT_SYSER(1, ptrace(PTRACE_CONT, getpid(), NULL, NULL), -1, ESRCH); break;
                CASE_TEST(syscall_noargs);    EXPECT_SYSEQ(1, syscall(__NR_getpid), getpid()); break;
                CASE_TEST(syscall_args);      EXPECT_SYSER(1, syscall(__NR_statx, 0, NULL, 0, 0, NULL), -1, EFAULT); break;
                CASE_TEST(namespace);         EXPECT_SYSZR(euid0 && proc, test_namespace()); break;
                case __LINE__:
                        return ret; /* must be last */
                /* note: do not set any defaults so as to permit holes above */
                }
        }
        return ret;
}

int test_difftime(void)
{
        if (difftime(200., 100.) != 100.)
                return 1;

        if (difftime(100., 200.) != -100.)
                return 1;

        return 0;
}

int test_time_types(void)
{
#ifdef NOLIBC
        struct __kernel_timespec kts;
        struct timespec ts;

        if (!__builtin_types_compatible_p(time_t, __kernel_time64_t))
                return 1;

        if (sizeof(ts) != sizeof(kts))
                return 1;

        if (!__builtin_types_compatible_p(__typeof__(ts.tv_sec), __typeof__(kts.tv_sec)))
                return 1;

        if (!__builtin_types_compatible_p(__typeof__(ts.tv_nsec), __typeof__(kts.tv_nsec)))
                return 1;

        if (offsetof(__typeof__(ts), tv_sec) != offsetof(__typeof__(kts), tv_sec))
                return 1;

        if (offsetof(__typeof__(ts), tv_nsec) != offsetof(__typeof__(kts), tv_nsec))
                return 1;
#endif /* NOLIBC */

        return 0;
}

int run_stdlib(int min, int max)
{
        int test;
        int ret = 0;

        for (test = min; test >= 0 && test <= max; test++) {
                int llen = 0; /* line length */

                /* For functions that take a long buffer, like strlcat()
                 * Add some more chars after the \0, to test functions that overwrite the buffer set
                 * the \0 at the exact right position.
                 */
                char buf[11] = "test123456";
                buf[4] = '\0';


                /* avoid leaving empty lines below, this will insert holes into
                 * test numbers.
                 */
                switch (test + __LINE__ + 1) {
                CASE_TEST(getenv_TERM);        EXPECT_STRNZ(1, getenv("TERM")); break;
                CASE_TEST(getenv_blah);        EXPECT_STRZR(1, getenv("blah")); break;
                CASE_TEST(setcmp_blah_blah);   EXPECT_EQ(1, strcmp("blah", "blah"), 0); break;
                CASE_TEST(setcmp_blah_blah2);  EXPECT_NE(1, strcmp("blah", "blah2"), 0); break;
                CASE_TEST(setncmp_blah_blah);  EXPECT_EQ(1, strncmp("blah", "blah", 10), 0); break;
                CASE_TEST(setncmp_blah_blah4); EXPECT_EQ(1, strncmp("blah", "blah4", 4), 0); break;
                CASE_TEST(setncmp_blah_blah5); EXPECT_NE(1, strncmp("blah", "blah5", 5), 0); break;
                CASE_TEST(setncmp_blah_blah6); EXPECT_NE(1, strncmp("blah", "blah6", 6), 0); break;
                CASE_TEST(strchr_foobar_o);    EXPECT_STREQ(1, strchr("foobar", 'o'), "oobar"); break;
                CASE_TEST(strchr_foobar_z);    EXPECT_STRZR(1, strchr("foobar", 'z')); break;
                CASE_TEST(strrchr_foobar_o);   EXPECT_STREQ(1, strrchr("foobar", 'o'), "obar"); break;
                CASE_TEST(strrchr_foobar_z);   EXPECT_STRZR(1, strrchr("foobar", 'z')); break;
                CASE_TEST(strlcat_0);          EXPECT_STRBUFEQ(is_nolibc, strlcat(buf, "bar", 0), buf, 3, "test"); break;
                CASE_TEST(strlcat_1);          EXPECT_STRBUFEQ(is_nolibc, strlcat(buf, "bar", 1), buf, 4, "test"); break;
                CASE_TEST(strlcat_5);          EXPECT_STRBUFEQ(is_nolibc, strlcat(buf, "bar", 5), buf, 7, "test"); break;
                CASE_TEST(strlcat_6);          EXPECT_STRBUFEQ(is_nolibc, strlcat(buf, "bar", 6), buf, 7, "testb"); break;
                CASE_TEST(strlcat_7);          EXPECT_STRBUFEQ(is_nolibc, strlcat(buf, "bar", 7), buf, 7, "testba"); break;
                CASE_TEST(strlcat_8);          EXPECT_STRBUFEQ(is_nolibc, strlcat(buf, "bar", 8), buf, 7, "testbar"); break;
                CASE_TEST(strlcpy_0);          EXPECT_STRBUFEQ(is_nolibc, strlcpy(buf, "bar", 0), buf, 3, "test"); break;
                CASE_TEST(strlcpy_1);          EXPECT_STRBUFEQ(is_nolibc, strlcpy(buf, "bar", 1), buf, 3, ""); break;
                CASE_TEST(strlcpy_2);          EXPECT_STRBUFEQ(is_nolibc, strlcpy(buf, "bar", 2), buf, 3, "b"); break;
                CASE_TEST(strlcpy_3);          EXPECT_STRBUFEQ(is_nolibc, strlcpy(buf, "bar", 3), buf, 3, "ba"); break;
                CASE_TEST(strlcpy_4);          EXPECT_STRBUFEQ(is_nolibc, strlcpy(buf, "bar", 4), buf, 3, "bar"); break;
                CASE_TEST(strstr_foobar_foo);  EXPECT_STREQ(1, strstr("foobar", "foo"), "foobar"); break;
                CASE_TEST(strstr_foobar_bar);  EXPECT_STREQ(1, strstr("foobar", "bar"), "bar"); break;
                CASE_TEST(strstr_foobar_baz);  EXPECT_PTREQ(1, strstr("foobar", "baz"), NULL); break;
                CASE_TEST(memcmp_20_20);       EXPECT_EQ(1, memcmp("aaa\x20", "aaa\x20", 4), 0); break;
                CASE_TEST(memcmp_20_60);       EXPECT_LT(1, memcmp("aaa\x20", "aaa\x60", 4), 0); break;
                CASE_TEST(memcmp_60_20);       EXPECT_GT(1, memcmp("aaa\x60", "aaa\x20", 4), 0); break;
                CASE_TEST(memcmp_20_e0);       EXPECT_LT(1, memcmp("aaa\x20", "aaa\xe0", 4), 0); break;
                CASE_TEST(memcmp_e0_20);       EXPECT_GT(1, memcmp("aaa\xe0", "aaa\x20", 4), 0); break;
                CASE_TEST(memcmp_80_e0);       EXPECT_LT(1, memcmp("aaa\x80", "aaa\xe0", 4), 0); break;
                CASE_TEST(memcmp_e0_80);       EXPECT_GT(1, memcmp("aaa\xe0", "aaa\x80", 4), 0); break;
                CASE_TEST(limit_int8_max);          EXPECT_EQ(1, INT8_MAX,         (int8_t)          0x7f); break;
                CASE_TEST(limit_int8_min);          EXPECT_EQ(1, INT8_MIN,         (int8_t)          0x80); break;
                CASE_TEST(limit_uint8_max);         EXPECT_EQ(1, UINT8_MAX,        (uint8_t)         0xff); break;
                CASE_TEST(limit_int16_max);         EXPECT_EQ(1, INT16_MAX,        (int16_t)         0x7fff); break;
                CASE_TEST(limit_int16_min);         EXPECT_EQ(1, INT16_MIN,        (int16_t)         0x8000); break;
                CASE_TEST(limit_uint16_max);        EXPECT_EQ(1, UINT16_MAX,       (uint16_t)        0xffff); break;
                CASE_TEST(limit_int32_max);         EXPECT_EQ(1, INT32_MAX,        (int32_t)         0x7fffffff); break;
                CASE_TEST(limit_int32_min);         EXPECT_EQ(1, INT32_MIN,        (int32_t)         0x80000000); break;
                CASE_TEST(limit_uint32_max);        EXPECT_EQ(1, UINT32_MAX,       (uint32_t)        0xffffffff); break;
                CASE_TEST(limit_int64_max);         EXPECT_EQ(1, INT64_MAX,        (int64_t)         0x7fffffffffffffff); break;
                CASE_TEST(limit_int64_min);         EXPECT_EQ(1, INT64_MIN,        (int64_t)         0x8000000000000000); break;
                CASE_TEST(limit_uint64_max);        EXPECT_EQ(1, UINT64_MAX,       (uint64_t)        0xffffffffffffffff); break;
                CASE_TEST(limit_int_least8_max);    EXPECT_EQ(1, INT_LEAST8_MAX,   (int_least8_t)    0x7f); break;
                CASE_TEST(limit_int_least8_min);    EXPECT_EQ(1, INT_LEAST8_MIN,   (int_least8_t)    0x80); break;
                CASE_TEST(limit_uint_least8_max);   EXPECT_EQ(1, UINT_LEAST8_MAX,  (uint_least8_t)   0xff); break;
                CASE_TEST(limit_int_least16_max);   EXPECT_EQ(1, INT_LEAST16_MAX,  (int_least16_t)   0x7fff); break;
                CASE_TEST(limit_int_least16_min);   EXPECT_EQ(1, INT_LEAST16_MIN,  (int_least16_t)   0x8000); break;
                CASE_TEST(limit_uint_least16_max);  EXPECT_EQ(1, UINT_LEAST16_MAX, (uint_least16_t)  0xffff); break;
                CASE_TEST(limit_int_least32_max);   EXPECT_EQ(1, INT_LEAST32_MAX,  (int_least32_t)   0x7fffffff); break;
                CASE_TEST(limit_int_least32_min);   EXPECT_EQ(1, INT_LEAST32_MIN,  (int_least32_t)   0x80000000); break;
                CASE_TEST(limit_uint_least32_max);  EXPECT_EQ(1, UINT_LEAST32_MAX, (uint_least32_t)  0xffffffffU); break;
                CASE_TEST(limit_int_least64_min);   EXPECT_EQ(1, INT_LEAST64_MIN,  (int_least64_t)   0x8000000000000000LL); break;
                CASE_TEST(limit_int_least64_max);   EXPECT_EQ(1, INT_LEAST64_MAX,  (int_least64_t)   0x7fffffffffffffffLL); break;
                CASE_TEST(limit_uint_least64_max);  EXPECT_EQ(1, UINT_LEAST64_MAX, (uint_least64_t)  0xffffffffffffffffULL); break;
                CASE_TEST(limit_int_fast8_max);     EXPECT_EQ(1, INT_FAST8_MAX,    (int_fast8_t)     0x7f); break;
                CASE_TEST(limit_int_fast8_min);     EXPECT_EQ(1, INT_FAST8_MIN,    (int_fast8_t)     0x80); break;
                CASE_TEST(limit_uint_fast8_max);    EXPECT_EQ(1, UINT_FAST8_MAX,   (uint_fast8_t)    0xff); break;
                CASE_TEST(limit_int_fast16_min);    EXPECT_EQ(1, INT_FAST16_MIN,   (int_fast16_t)    SINT_MIN_OF_TYPE(int_fast16_t)); break;
                CASE_TEST(limit_int_fast16_max);    EXPECT_EQ(1, INT_FAST16_MAX,   (int_fast16_t)    SINT_MAX_OF_TYPE(int_fast16_t)); break;
                CASE_TEST(limit_uint_fast16_max);   EXPECT_EQ(1, UINT_FAST16_MAX,  (uint_fast16_t)   UINTPTR_MAX); break;
                CASE_TEST(limit_int_fast32_min);    EXPECT_EQ(1, INT_FAST32_MIN,   (int_fast32_t)    SINT_MIN_OF_TYPE(int_fast32_t)); break;
                CASE_TEST(limit_int_fast32_max);    EXPECT_EQ(1, INT_FAST32_MAX,   (int_fast32_t)    SINT_MAX_OF_TYPE(int_fast32_t)); break;
                CASE_TEST(limit_uint_fast32_max);   EXPECT_EQ(1, UINT_FAST32_MAX,  (uint_fast32_t)   UINTPTR_MAX); break;
                CASE_TEST(limit_int_fast64_min);    EXPECT_EQ(1, INT_FAST64_MIN,   (int_fast64_t)    INT64_MIN); break;
                CASE_TEST(limit_int_fast64_max);    EXPECT_EQ(1, INT_FAST64_MAX,   (int_fast64_t)    INT64_MAX); break;
                CASE_TEST(limit_uint_fast64_max);   EXPECT_EQ(1, UINT_FAST64_MAX,  (uint_fast64_t)   UINT64_MAX); break;
                CASE_TEST(sizeof_long_sane);        EXPECT_EQ(1, sizeof(long) == 8 || sizeof(long) == 4, 1); break;
                CASE_TEST(limit_intptr_min);        EXPECT_EQ(1, INTPTR_MIN,  sizeof(long) == 8 ? (intptr_t)  0x8000000000000000LL  : (intptr_t)  0x80000000); break;
                CASE_TEST(limit_intptr_max);        EXPECT_EQ(1, INTPTR_MAX,  sizeof(long) == 8 ? (intptr_t)  0x7fffffffffffffffLL  : (intptr_t)  0x7fffffff); break;
                CASE_TEST(limit_uintptr_max);       EXPECT_EQ(1, UINTPTR_MAX, sizeof(long) == 8 ? (uintptr_t) 0xffffffffffffffffULL : (uintptr_t) 0xffffffffU); break;
                CASE_TEST(limit_ptrdiff_min);       EXPECT_EQ(1, PTRDIFF_MIN, sizeof(long) == 8 ? (ptrdiff_t) 0x8000000000000000LL  : (ptrdiff_t) 0x80000000); break;
                CASE_TEST(limit_ptrdiff_max);       EXPECT_EQ(1, PTRDIFF_MAX, sizeof(long) == 8 ? (ptrdiff_t) 0x7fffffffffffffffLL  : (ptrdiff_t) 0x7fffffff); break;
                CASE_TEST(limit_size_max);          EXPECT_EQ(1, SIZE_MAX,    sizeof(long) == 8 ? (size_t)    0xffffffffffffffffULL : (size_t)    0xffffffffU); break;
                CASE_TEST(strtol_simple);           EXPECT_STRTOX(1, strtol, "35", 10, 35, -1, 0); break;
                CASE_TEST(strtol_positive);         EXPECT_STRTOX(1, strtol, "+35", 10, 35, -1, 0); break;
                CASE_TEST(strtol_negative);         EXPECT_STRTOX(1, strtol, "-35", 10, -35, -1, 0); break;
                CASE_TEST(strtol_hex_auto);         EXPECT_STRTOX(1, strtol, "0xFF", 0, 255, -1, 0); break;
                CASE_TEST(strtol_base36);           EXPECT_STRTOX(1, strtol, "12yZ", 36, 50507, -1, 0); break;
                CASE_TEST(strtol_cutoff);           EXPECT_STRTOX(1, strtol, "1234567890", 8, 342391, 7, 0); break;
                CASE_TEST(strtol_octal_auto);       EXPECT_STRTOX(1, strtol, "011", 0, 9, -1, 0); break;
                CASE_TEST(strtol_hex_00);           EXPECT_STRTOX(1, strtol, "0x00", 16, 0, -1, 0); break;
                CASE_TEST(strtol_hex_FF);           EXPECT_STRTOX(1, strtol, "FF", 16, 255, -1, 0); break;
                CASE_TEST(strtol_hex_ff);           EXPECT_STRTOX(1, strtol, "ff", 16, 255, -1, 0); break;
                CASE_TEST(strtol_hex_prefix);       EXPECT_STRTOX(1, strtol, "0xFF", 16, 255, -1, 0); break;
                CASE_TEST(strtol_trailer);          EXPECT_STRTOX(1, strtol, "35foo", 10, 35, 2, 0); break;
                CASE_TEST(strtol_overflow);         EXPECT_STRTOX(1, strtol, "0x8000000000000000", 16, LONG_MAX, -1, ERANGE); break;
                CASE_TEST(strtol_underflow);        EXPECT_STRTOX(1, strtol, "-0x8000000000000001", 16, LONG_MIN, -1, ERANGE); break;
                CASE_TEST(strtoul_negative);        EXPECT_STRTOX(1, strtoul, "-0x1", 16, ULONG_MAX, 4, 0); break;
                CASE_TEST(strtoul_overflow);        EXPECT_STRTOX(1, strtoul, "0x10000000000000000", 16, ULONG_MAX, -1, ERANGE); break;
                CASE_TEST(strerror_success);        EXPECT_STREQ(is_nolibc, strerror(0), "errno=0"); break;
                CASE_TEST(strerror_EINVAL);         EXPECT_STREQ(is_nolibc, strerror(EINVAL), "errno=22"); break;
                CASE_TEST(strerror_int_max);        EXPECT_STREQ(is_nolibc, strerror(INT_MAX), "errno=2147483647"); break;
                CASE_TEST(strerror_int_min);        EXPECT_STREQ(is_nolibc, strerror(INT_MIN), "errno=-2147483648"); break;
                CASE_TEST(tolower);                 EXPECT_EQ(1, tolower('A'), 'a'); break;
                CASE_TEST(tolower_noop);            EXPECT_EQ(1, tolower('a'), 'a'); break;
                CASE_TEST(toupper);                 EXPECT_EQ(1, toupper('a'), 'A'); break;
                CASE_TEST(toupper_noop);            EXPECT_EQ(1, toupper('A'), 'A'); break;
                CASE_TEST(abs);                     EXPECT_EQ(1, abs(-10), 10); break;
                CASE_TEST(abs_noop);                EXPECT_EQ(1, abs(10), 10); break;
                CASE_TEST(difftime);                EXPECT_ZR(1, test_difftime()); break;
                CASE_TEST(memchr_foobar6_o);        EXPECT_STREQ(1, memchr("foobar", 'o', 6), "oobar"); break;
                CASE_TEST(memchr_foobar3_b);        EXPECT_STRZR(1, memchr("foobar", 'b', 3)); break;
                CASE_TEST(time_types);              EXPECT_ZR(is_nolibc, test_time_types()); break;

                case __LINE__:
                        return ret; /* must be last */
                /* note: do not set any defaults so as to permit holes above */
                }
        }
        return ret;
}

#define EXPECT_VFPRINTF(c, expected, fmt, ...)                          \
        ret += expect_vfprintf(llen, c, expected, fmt, ##__VA_ARGS__)

static int expect_vfprintf(int llen, int c, const char *expected, const char *fmt, ...)
{
        char buf[100];
        va_list args;
        ssize_t w;
        int ret;


        va_start(args, fmt);
        /* Only allow writing 21 bytes, to test truncation */
        w = vsnprintf(buf, 21, fmt, args);
        va_end(args);

        if (w != c) {
                llen += printf(" written(%d) != %d", (int)w, c);
                result(llen, FAIL);
                return 1;
        }

        llen += printf(" \"%s\" = \"%s\"", expected, buf);
        ret = strncmp(expected, buf, c);

        result(llen, ret ? FAIL : OK);
        return ret;
}

static int test_scanf(void)
{
        unsigned long long ull;
        unsigned long ul;
        unsigned int u;
        long long ll;
        long l;
        void *p;
        int i;

        /* return __LINE__ to point to the specific failure */

        /* test EOF */
        if (sscanf("", "foo") != EOF)
                return __LINE__;

        /* test simple literal without placeholder */
        if (sscanf("foo", "foo") != 0)
                return __LINE__;

        /* test single placeholder */
        if (sscanf("123", "%d", &i) != 1)
                return __LINE__;

        if (i != 123)
                return __LINE__;

        /* test multiple place holders and separators */
        if (sscanf("a123b456c0x90", "a%db%uc%p", &i, &u, &p) != 3)
                return __LINE__;

        if (i != 123)
                return __LINE__;

        if (u != 456)
                return __LINE__;

        if (p != (void *)0x90)
                return __LINE__;

        /* test space handling */
        if (sscanf("a    b1", "a b%d", &i) != 1)
                return __LINE__;

        if (i != 1)
                return __LINE__;

        /* test literal percent */
        if (sscanf("a%1", "a%%%d", &i) != 1)
                return __LINE__;

        if (i != 1)
                return __LINE__;

        /* test stdint.h types */
        if (sscanf("1|2|3|4|5|6",
                   "%d|%ld|%lld|%u|%lu|%llu",
                   &i, &l, &ll, &u, &ul, &ull) != 6)
                return __LINE__;

        if (i != 1 || l != 2 || ll != 3 ||
            u != 4 || ul != 5 || ull != 6)
                return __LINE__;

        return 0;
}

int test_strerror(void)
{
        char buf[100];
        ssize_t ret;

        memset(buf, 'A', sizeof(buf));

        errno = EINVAL;
        ret = snprintf(buf, sizeof(buf), "%m");
        if (is_nolibc) {
                if (ret < 6 || memcmp(buf, "errno=", 6))
                        return 1;
        }

        return 0;
}

static int test_printf_error(void)
{
        int fd, ret, saved_errno;

        fd = open("/dev/full", O_RDWR);
        if (fd == -1)
                return 1;

        errno = 0;
        ret = dprintf(fd, "foo");
        saved_errno = errno;
        close(fd);

        if (ret != -1)
                return 2;

        if (saved_errno != ENOSPC)
                return 3;

        return 0;
}

static int run_printf(int min, int max)
{
        int test;
        int ret = 0;

        for (test = min; test >= 0 && test <= max; test++) {
                int llen = 0; /* line length */

                /* avoid leaving empty lines below, this will insert holes into
                 * test numbers.
                 */
                switch (test + __LINE__ + 1) {
                CASE_TEST(empty);        EXPECT_VFPRINTF(0, "", ""); break;
                CASE_TEST(simple);       EXPECT_VFPRINTF(3, "foo", "foo"); break;
                CASE_TEST(string);       EXPECT_VFPRINTF(3, "foo", "%s", "foo"); break;
                CASE_TEST(number);       EXPECT_VFPRINTF(4, "1234", "%d", 1234); break;
                CASE_TEST(negnumber);    EXPECT_VFPRINTF(5, "-1234", "%d", -1234); break;
                CASE_TEST(unsigned);     EXPECT_VFPRINTF(5, "12345", "%u", 12345); break;
                CASE_TEST(char);         EXPECT_VFPRINTF(1, "c", "%c", 'c'); break;
                CASE_TEST(hex);          EXPECT_VFPRINTF(1, "f", "%x", 0xf); break;
                CASE_TEST(pointer);      EXPECT_VFPRINTF(3, "0x1", "%p", (void *) 0x1); break;
                CASE_TEST(uintmax_t);    EXPECT_VFPRINTF(20, "18446744073709551615", "%ju", 0xffffffffffffffffULL); break;
                CASE_TEST(intmax_t);     EXPECT_VFPRINTF(20, "-9223372036854775807", "%jd", 0x8000000000000001LL); break;
                CASE_TEST(truncation);   EXPECT_VFPRINTF(25, "01234567890123456789", "%s", "0123456789012345678901234"); break;
                CASE_TEST(string_width); EXPECT_VFPRINTF(10, "         1", "%10s", "1"); break;
                CASE_TEST(number_width); EXPECT_VFPRINTF(10, "         1", "%10d", 1); break;
                CASE_TEST(width_trunc);  EXPECT_VFPRINTF(25, "                    ", "%25d", 1); break;
                CASE_TEST(scanf);        EXPECT_ZR(1, test_scanf()); break;
                CASE_TEST(strerror);     EXPECT_ZR(1, test_strerror()); break;
                CASE_TEST(printf_error); EXPECT_ZR(1, test_printf_error()); break;
                case __LINE__:
                        return ret; /* must be last */
                /* note: do not set any defaults so as to permit holes above */
                }
        }
        return ret;
}

__attribute__((no_sanitize("undefined")))
static int smash_stack(void)
{
        char buf[100];
        volatile char *ptr = buf;
        size_t i;

        for (i = 0; i < 200; i++)
                ptr[i] = 'P';

        return 1;
}

static int run_protection(int min __attribute__((unused)),
                          int max __attribute__((unused)))
{
        pid_t pid;
        int llen = 0, status;
        struct rlimit rlimit = { 0, 0 };

        llen += printf("0 -fstackprotector ");

#if !defined(_NOLIBC_STACKPROTECTOR)
        llen += printf("not supported");
        result(llen, SKIPPED);
        return 0;
#endif

#if defined(_NOLIBC_STACKPROTECTOR)
        if (!__stack_chk_guard) {
                llen += printf("__stack_chk_guard not initialized");
                result(llen, FAIL);
                return 1;
        }
#endif

        pid = -1;
        pid = fork();

        switch (pid) {
        case -1:
                llen += printf("fork()");
                result(llen, FAIL);
                return 1;

        case 0:
                close(STDOUT_FILENO);
                close(STDERR_FILENO);

                prctl(PR_SET_DUMPABLE, 0, 0, 0, 0);
                setrlimit(RLIMIT_CORE, &rlimit);
                smash_stack();
                return 1;

        default:
                pid = waitpid(pid, &status, 0);

                if (pid == -1 || !WIFSIGNALED(status) || WTERMSIG(status) != SIGABRT) {
                        llen += printf("waitpid()");
                        result(llen, FAIL);
                        return 1;
                }
                result(llen, OK);
                return 0;
        }
}

/* prepare what needs to be prepared for pid 1 (stdio, /dev, /proc, etc) */
int prepare(void)
{
        struct stat stat_buf;

        /* It's possible that /dev doesn't even exist or was not mounted, so
         * we'll try to create it, mount it, or create minimal entries into it.
         * We want at least /dev/null and /dev/console.
         */
        if (stat("/dev/.", &stat_buf) == 0 || mkdir("/dev", 0755) == 0) {
                if (stat("/dev/console", &stat_buf) != 0 ||
                    stat("/dev/null", &stat_buf) != 0 ||
                    stat("/dev/zero", &stat_buf) != 0 ||
                    stat("/dev/full", &stat_buf) != 0) {
                        /* try devtmpfs first, otherwise fall back to manual creation */
                        if (mount("/dev", "/dev", "devtmpfs", 0, 0) != 0) {
                                mknod("/dev/console", 0600 | S_IFCHR, makedev(5, 1));
                                mknod("/dev/null",    0666 | S_IFCHR, makedev(1, 3));
                                mknod("/dev/zero",    0666 | S_IFCHR, makedev(1, 5));
                                mknod("/dev/full",    0666 | S_IFCHR, makedev(1, 7));
                        }
                }
        }

        /* If no /dev/console was found before calling init, stdio is closed so
         * we need to reopen it from /dev/console. If it failed above, it will
         * still fail here and we cannot emit a message anyway.
         */
        if (close(dup(1)) == -1) {
                int fd = open("/dev/console", O_RDWR);

                if (fd >= 0) {
                        if (fd != 0)
                                dup2(fd, 0);
                        if (fd != 1)
                                dup2(fd, 1);
                        if (fd != 2)
                                dup2(fd, 2);
                        if (fd > 2)
                                close(fd);
                        puts("\nSuccessfully reopened /dev/console.");
                }
        }

        /* try to mount /proc if not mounted. Silently fail otherwise */
        if (stat("/proc/.", &stat_buf) == 0 || mkdir("/proc", 0755) == 0) {
                if (stat("/proc/self", &stat_buf) != 0) {
                        /* If not mountable, remove /proc completely to avoid misuse */
                        if (mount("none", "/proc", "proc", 0, 0) != 0)
                                rmdir("/proc");
                }
        }

        /* some tests rely on a writable /tmp */
        mkdir("/tmp", 0755);

        return 0;
}

/* This is the definition of known test names, with their functions */
static const struct test test_names[] = {
        /* add new tests here */
        { .name = "startup",    .func = run_startup    },
        { .name = "syscall",    .func = run_syscall    },
        { .name = "stdlib",     .func = run_stdlib     },
        { .name = "printf",     .func = run_printf     },
        { .name = "protection", .func = run_protection },
        { 0 }
};

static int is_setting_valid(char *test)
{
        int idx, len, test_len, valid = 0;
        char delimiter;

        if (!test)
                return valid;

        test_len = strlen(test);

        for (idx = 0; test_names[idx].name; idx++) {
                len = strlen(test_names[idx].name);
                if (test_len < len)
                        continue;

                if (strncmp(test, test_names[idx].name, len) != 0)
                        continue;

                delimiter = test[len];
                if (delimiter != ':' && delimiter != ',' && delimiter != '\0')
                        continue;

                valid = 1;
                break;
        }

        return valid;
}

int main(int argc, char **argv, char **envp)
{
        int min = 0;
        int max = INT_MAX;
        int ret = 0;
        int err;
        int idx;
        char *test;

        argv0 = argv[0];
        test_argc = argc;
        test_argv = argv;
        test_envp = envp;

        /* when called as init, it's possible that no console was opened, for
         * example if no /dev file system was provided. We'll check that fd#1
         * was opened, and if not we'll attempt to create and open /dev/console
         * and /dev/null that we'll use for later tests.
         */
        if (getpid() == 1)
                prepare();

        /* the definition of a series of tests comes from either argv[1] or the
         * "NOLIBC_TEST" environment variable. It's made of a comma-delimited
         * series of test names and optional ranges:
         *    syscall:5-15[:.*],stdlib:8-10
         */
        test = argv[1];
        if (!is_setting_valid(test))
                test = getenv("NOLIBC_TEST");

        if (is_setting_valid(test)) {
                char *comma, *colon, *dash, *value;

                do {
                        comma = strchr(test, ',');
                        if (comma)
                                *(comma++) = '\0';

                        colon = strchr(test, ':');
                        if (colon)
                                *(colon++) = '\0';

                        for (idx = 0; test_names[idx].name; idx++) {
                                if (strcmp(test, test_names[idx].name) == 0)
                                        break;
                        }

                        if (test_names[idx].name) {
                                /* The test was named, it will be called at least
                                 * once. We may have an optional range at <colon>
                                 * here, which defaults to the full range.
                                 */
                                do {
                                        min = 0; max = INT_MAX;
                                        value = colon;
                                        if (value && *value) {
                                                colon = strchr(value, ':');
                                                if (colon)
                                                        *(colon++) = '\0';

                                                dash = strchr(value, '-');
                                                if (dash)
                                                        *(dash++) = '\0';

                                                /* support :val: :min-max: :min-: :-max: */
                                                if (*value)
                                                        min = atoi(value);
                                                if (!dash)
                                                        max = min;
                                                else if (*dash)
                                                        max = atoi(dash);

                                                value = colon;
                                        }

                                        /* now's time to call the test */
                                        printf("Running test '%s'\n", test_names[idx].name);
                                        err = test_names[idx].func(min, max);
                                        ret += err;
                                        printf("Errors during this test: %d\n\n", err);
                                } while (colon && *colon);
                        } else
                                printf("Ignoring unknown test name '%s'\n", test);

                        test = comma;
                } while (test && *test);
        } else {
                /* no test mentioned, run everything */
                for (idx = 0; test_names[idx].name; idx++) {
                        printf("Running test '%s'\n", test_names[idx].name);
                        err = test_names[idx].func(min, max);
                        ret += err;
                        printf("Errors during this test: %d\n\n", err);
                }
        }

        printf("Total number of errors: %d\n", ret);

        if (getpid() == 1) {
                /* we're running as init, there's no other process on the
                 * system, thus likely started from a VM for a quick check.
                 * Exiting will provoke a kernel panic that may be reported
                 * as an error by Qemu or the hypervisor, while stopping
                 * cleanly will often be reported as a success. This allows
                 * to use the output of this program for bisecting kernels.
                 */
                printf("Leaving init with final status: %d\n", !!ret);
                if (ret == 0)
                        reboot(RB_POWER_OFF);
#if defined(__x86_64__)
                /* QEMU started with "-device isa-debug-exit -no-reboot" will
                 * exit with status code 2N+1 when N is written to 0x501. We
                 * hard-code the syscall here as it's arch-dependent.
                 */
                else if (syscall(__NR_ioperm, 0x501, 1, 1) == 0)
                        __asm__ volatile ("outb %%al, %%dx" :: "d"(0x501), "a"(0));
                /* if it does nothing, fall back to the regular panic */
#endif
        }

        printf("Exiting with status %d\n", !!ret);
        return !!ret;
}