/*      $OpenBSD: t_select.c,v 1.2 2020/11/09 23:18:51 bluhm Exp $      */
/*      $NetBSD: t_select.c,v 1.4 2017/01/13 21:18:33 christos Exp $ */

/*-
 * Copyright (c) 2011 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundatiom
 * by Christos Zoulas.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "macros.h"

#include <assert.h>
#include <sys/types.h>
#include <sys/select.h>
#include <sys/wait.h>
#include <err.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>

#include "atf-c.h"

static sig_atomic_t keep_going = 1;

static void
sig_handler(int signum __unused)
{
        keep_going = 0;
}

static void
sigchld(int signum __unused)
{
}

static char
xtoa(uint8_t n)
{
        static const char xarray[] = "0123456789abcdef";
        assert(n < sizeof(xarray));
        return xarray[n];
}

static const char *
prmask(const sigset_t *m, char *buf, size_t len)
{
        size_t j = 2;
        assert(len >= 3 + sizeof(*m));
        buf[0] = '0';
        buf[1] = 'x';
#define N(p, a) (((p) >> ((a) * 4)) & 0xf)
#ifdef __OpenBSD__
        /* On NetBSD sigset_t is a struct */
        uint32_t p = (*m);
        for (size_t k = sizeof(p); k > 0; k--)
                buf[j++] = xtoa(N(p, k - 1));
#else
        for (size_t i = __arraycount(m->__bits); i > 0; i--) {
                uint32_t p = m->__bits[i - 1];
                for (size_t k = sizeof(p); k > 0; k--)
                        buf[j++] = xtoa(N(p, k - 1));
        }
#endif
        buf[j] = '\0';
        return buf;
}

static __dead void
child(const struct timespec *ts)
{
        struct sigaction sa;
        sigset_t set, oset, nset;
        char obuf[sizeof(oset) + 3], nbuf[sizeof(nset) + 3];
        int fd;

        memset(&sa, 0, sizeof(sa));
        sa.sa_handler = sig_handler;
        if ((fd = open("/dev/null", O_RDONLY)) == -1)
                err(1, "open");

        if (sigaction(SIGTERM, &sa, NULL) == -1)
                err(1, "sigaction");

        sigfillset(&set);
        if (sigprocmask(SIG_BLOCK, &set, NULL) == -1)
                err(1, "sigprocmask");

        if (sigprocmask(SIG_BLOCK, NULL, &oset) == -1)
                err(1, "sigprocmask");

        sigemptyset(&set);

        for (;;) {
                fd_set rset;
                FD_ZERO(&rset);
                FD_SET(fd, &rset);
                if (pselect(1, &rset, NULL, NULL, ts, &set) == -1) {
                        if(errno == EINTR) {
                                if (!keep_going)
                                        break;
                        }
                }
                if (ts)
                        break;
        }
        if (sigprocmask(SIG_BLOCK, NULL, &nset) == -1)
                err(1, "sigprocmask");
        if (memcmp(&oset, &nset, sizeof(oset)) != 0)
                atf_tc_fail("pselect() masks don't match "
                    "after timeout %s != %s",
                    prmask(&nset, nbuf, sizeof(nbuf)),
                    prmask(&oset, obuf, sizeof(obuf)));
        _exit(0);
}

ATF_TC(pselect_sigmask);
ATF_TC_HEAD(pselect_sigmask, tc)
{
        atf_tc_set_md_var(tc, "descr", "Checks pselect's temporary mask "
            "setting when a signal is received (PR lib/43625)");
}

ATF_TC_BODY(pselect_sigmask, tc)
{
        pid_t pid;
        int status;

        signal(SIGCHLD, sigchld);

        switch (pid = fork()) {
        case 0:
                child(NULL);
                /*NOTREACHED*/
        case -1:
                err(1, "fork");
        default:
                sleep(1);
                if (kill(pid, SIGTERM) == -1)
                        err(1, "kill");
                sleep(1);
                switch (waitpid(pid, &status, WNOHANG)) {
                case -1:
                        err(1, "wait");
                case 0:
                        if (kill(pid, SIGKILL) == -1)
                                err(1, "kill");
                        atf_tc_fail("pselect() did not receive signal");
                        break;
                default:
                        break;
                }
        }
}

ATF_TC(pselect_timeout);
ATF_TC_HEAD(pselect_timeout, tc)
{

        atf_tc_set_md_var(tc, "descr", "Checks pselect's temporary mask "
            "setting when a timeout occurs");
}

ATF_TC_BODY(pselect_timeout, tc)
{
        pid_t pid;
        int status;
        static const struct timespec zero = { 0, 0 };

        signal(SIGCHLD, sigchld);

        switch (pid = fork()) {
        case 0:
                child(&zero);
                break;
        case -1:
                err(1, "fork");
        default:
                sleep(1);
                switch (waitpid(pid, &status, WNOHANG)) {
                case -1:
                        err(1, "wait");
                case 0:
                        if (kill(pid, SIGKILL) == -1)
                                err(1, "kill");
                        atf_tc_fail("pselect() did not receive signal");
                        break;
                default:
                        break;
                }
        }
}

ATF_TP_ADD_TCS(tp)
{

        ATF_TP_ADD_TC(tp, pselect_sigmask);
        ATF_TP_ADD_TC(tp, pselect_timeout);

        return atf_no_error();
}