/*      $NetBSD: t_ptrace_lwp_wait.h,v 1.2 2025/05/02 02:24:32 riastradh Exp $  */

/*-
 * Copyright (c) 2016, 2017, 2018, 2019, 2020 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * 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.
 */

static int lwpinfo_thread_sigmask[] = {SIGXCPU, SIGPIPE, SIGALRM, SIGURG};

static pthread_mutex_t lwpinfo_thread_mtx = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t lwpinfo_thread_cnd = PTHREAD_COND_INITIALIZER;
static volatile size_t lwpinfo_thread_done;

static void *
lwpinfo_thread(void *arg)
{
        sigset_t s;
        volatile void **tcb;

        tcb = (volatile void **)arg;

        *tcb = _lwp_getprivate();
        DPRINTF("Storing tcb[] = %p from thread %d\n", *tcb, _lwp_self());

        pthread_setname_np(pthread_self(), "thread %d",
            (void *)(intptr_t)_lwp_self());

        sigemptyset(&s);
        pthread_mutex_lock(&lwpinfo_thread_mtx);
        sigaddset(&s, lwpinfo_thread_sigmask[lwpinfo_thread_done]);
        lwpinfo_thread_done++;
        pthread_sigmask(SIG_BLOCK, &s, NULL);
        pthread_cond_signal(&lwpinfo_thread_cnd);
        pthread_mutex_unlock(&lwpinfo_thread_mtx);

        return infinite_thread(NULL);
}

static void
traceme_lwpinfo(const size_t threads, const char *iter)
{
        const int sigval = SIGSTOP;
        const int sigval2 = SIGINT;
        pid_t child, wpid;
#if defined(TWAIT_HAVE_STATUS)
        int status;
#endif
        struct ptrace_lwpinfo lwp = {0, 0};
        struct ptrace_lwpstatus lwpstatus = {0};
        struct ptrace_siginfo info;
        void *private;
        char *name;
        char namebuf[PL_LNAMELEN];
        volatile void *tcb[4];
        bool found;
        sigset_t s;

        /* Maximum number of supported threads in this test */
        pthread_t t[__arraycount(tcb) - 1];
        size_t n, m;
        int rv;
        size_t bytes_read;

        struct ptrace_io_desc io;
        sigset_t sigmask;

        ATF_REQUIRE(__arraycount(t) >= threads);
        memset(tcb, 0, sizeof(tcb));

        DPRINTF("Before forking process PID=%d\n", getpid());
        SYSCALL_REQUIRE((child = fork()) != -1);
        if (child == 0) {
                DPRINTF("Before calling PT_TRACE_ME from child %d\n", getpid());
                FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);

                tcb[0] = _lwp_getprivate();
                DPRINTF("Storing tcb[0] = %p\n", tcb[0]);

                pthread_setname_np(pthread_self(), "thread %d",
                    (void *)(intptr_t)_lwp_self());

                sigemptyset(&s);
                sigaddset(&s, lwpinfo_thread_sigmask[lwpinfo_thread_done]);
                pthread_sigmask(SIG_BLOCK, &s, NULL);

                DPRINTF("Before raising %s from child\n", strsignal(sigval));
                FORKEE_ASSERT(raise(sigval) == 0);

                for (n = 0; n < threads; n++) {
                        rv = pthread_create(&t[n], NULL, lwpinfo_thread,
                            &tcb[n + 1]);
                        FORKEE_ASSERT(rv == 0);
                }

                pthread_mutex_lock(&lwpinfo_thread_mtx);
                while (lwpinfo_thread_done < threads) {
                        pthread_cond_wait(&lwpinfo_thread_cnd,
                            &lwpinfo_thread_mtx);
                }
                pthread_mutex_unlock(&lwpinfo_thread_mtx);

                DPRINTF("Before raising %s from child\n", strsignal(sigval2));
                FORKEE_ASSERT(raise(sigval2) == 0);

                /* NOTREACHED */
                FORKEE_ASSERTX(0 && "Not reached");
        }
        DPRINTF("Parent process PID=%d, child's PID=%d\n", getpid(), child);

        DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
        TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

        validate_status_stopped(status, sigval);

        DPRINTF("Before calling ptrace(2) with PT_GET_SIGINFO for child");
        SYSCALL_REQUIRE(
            ptrace(PT_GET_SIGINFO, child, &info, sizeof(info)) != -1);

        DPRINTF("Signal traced to lwpid=%d\n", info.psi_lwpid);
        DPRINTF("Signal properties: si_signo=%#x si_code=%#x si_errno=%#x\n",
            info.psi_siginfo.si_signo, info.psi_siginfo.si_code,
            info.psi_siginfo.si_errno);

        ATF_REQUIRE_EQ(info.psi_siginfo.si_signo, sigval);
        ATF_REQUIRE_EQ(info.psi_siginfo.si_code, SI_LWP);

        if (strstr(iter, "LWPINFO") != NULL) {
                DPRINTF("Before calling ptrace(2) with PT_LWPINFO for child\n");
                SYSCALL_REQUIRE(ptrace(PT_LWPINFO, child, &lwp, sizeof(lwp))
                    != -1);

                DPRINTF("Assert that there exists a single thread only\n");
                ATF_REQUIRE(lwp.pl_lwpid > 0);

                DPRINTF("Assert that lwp thread %d received event "
                    "PL_EVENT_SIGNAL\n", lwp.pl_lwpid);
                FORKEE_ASSERT_EQ(lwp.pl_event, PL_EVENT_SIGNAL);

                if (strstr(iter, "LWPSTATUS") != NULL) {
                        DPRINTF("Before calling ptrace(2) with PT_LWPSTATUS "
                            "for child\n");
                        lwpstatus.pl_lwpid = lwp.pl_lwpid;
                        SYSCALL_REQUIRE(ptrace(PT_LWPSTATUS, child, &lwpstatus,
                            sizeof(lwpstatus)) != -1);
                }

                DPRINTF("Before calling ptrace(2) with PT_LWPINFO for child\n");
                SYSCALL_REQUIRE(ptrace(PT_LWPINFO, child, &lwp, sizeof(lwp))
                    != -1);

                DPRINTF("Assert that there exists a single thread only\n");
                ATF_REQUIRE_EQ(lwp.pl_lwpid, 0);
        } else {
                DPRINTF("Before calling ptrace(2) with PT_LWPNEXT for child\n");
                SYSCALL_REQUIRE(ptrace(PT_LWPNEXT, child, &lwpstatus,
                    sizeof(lwpstatus)) != -1);

                DPRINTF("Assert that there exists a single thread only %d\n", lwpstatus.pl_lwpid);
                ATF_REQUIRE(lwpstatus.pl_lwpid > 0);

                DPRINTF("Before calling ptrace(2) with PT_LWPNEXT for child\n");
                SYSCALL_REQUIRE(ptrace(PT_LWPNEXT, child, &lwpstatus,
                    sizeof(lwpstatus)) != -1);

                DPRINTF("Assert that there exists a single thread only\n");
                ATF_REQUIRE_EQ(lwpstatus.pl_lwpid, 0);
        }

        DPRINTF("Before resuming the child process where it left off and "
            "without signal to be sent\n");
        SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);

        DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
        TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

        validate_status_stopped(status, sigval2);

        DPRINTF("Before calling ptrace(2) with PT_GET_SIGINFO for child");
        SYSCALL_REQUIRE(
            ptrace(PT_GET_SIGINFO, child, &info, sizeof(info)) != -1);

        DPRINTF("Signal traced to lwpid=%d\n", info.psi_lwpid);
        DPRINTF("Signal properties: si_signo=%#x si_code=%#x si_errno=%#x\n",
            info.psi_siginfo.si_signo, info.psi_siginfo.si_code,
            info.psi_siginfo.si_errno);

        ATF_REQUIRE_EQ(info.psi_siginfo.si_signo, sigval2);
        ATF_REQUIRE_EQ(info.psi_siginfo.si_code, SI_LWP);

        memset(&lwp, 0, sizeof(lwp));
        memset(&lwpstatus, 0, sizeof(lwpstatus));

        memset(&io, 0, sizeof(io));

        bytes_read = 0;
        io.piod_op = PIOD_READ_D;
        io.piod_len = sizeof(tcb);

        do {
                io.piod_addr = (char *)&tcb + bytes_read;
                io.piod_offs = io.piod_addr;

                rv = ptrace(PT_IO, child, &io, sizeof(io));
                ATF_REQUIRE(rv != -1 && io.piod_len != 0);

                bytes_read += io.piod_len;
                io.piod_len = sizeof(tcb) - bytes_read;
        } while (bytes_read < sizeof(tcb));

        for (n = 0; n <= threads; n++) {
                if (strstr(iter, "LWPINFO") != NULL) {
                        DPRINTF("Before calling ptrace(2) with PT_LWPINFO for "
                            "child\n");
                        SYSCALL_REQUIRE(
                            ptrace(PT_LWPINFO, child, &lwp, sizeof(lwp)) != -1);
                        DPRINTF("LWP=%d\n", lwp.pl_lwpid);

                        DPRINTF("Assert that the thread exists\n");
                        ATF_REQUIRE(lwp.pl_lwpid > 0);

                        DPRINTF("Assert that lwp thread %d received expected "
                            "event\n", lwp.pl_lwpid);
                        FORKEE_ASSERT_EQ(lwp.pl_event,
                            info.psi_lwpid == lwp.pl_lwpid ?
                            PL_EVENT_SIGNAL : PL_EVENT_NONE);

                        if (strstr(iter, "LWPSTATUS") != NULL) {
                                DPRINTF("Before calling ptrace(2) with "
                                    "PT_LWPSTATUS for child\n");
                                lwpstatus.pl_lwpid = lwp.pl_lwpid;
                                SYSCALL_REQUIRE(ptrace(PT_LWPSTATUS, child,
                                    &lwpstatus, sizeof(lwpstatus)) != -1);

                                goto check_lwpstatus;
                        }
                } else {
                        DPRINTF("Before calling ptrace(2) with PT_LWPNEXT for "
                            "child\n");
                        SYSCALL_REQUIRE(
                            ptrace(PT_LWPNEXT, child, &lwpstatus,
                            sizeof(lwpstatus)) != -1);
                        DPRINTF("LWP=%d\n", lwpstatus.pl_lwpid);

                        DPRINTF("Assert that the thread exists\n");
                        ATF_REQUIRE(lwpstatus.pl_lwpid > 0);

                check_lwpstatus:

                        if (strstr(iter, "pl_sigmask") != NULL) {
                                sigmask = lwpstatus.pl_sigmask;

                                DPRINTF("Retrieved sigmask: "
                                    "%02x%02x%02x%02x\n",
                                    sigmask.__bits[0], sigmask.__bits[1],
                                    sigmask.__bits[2], sigmask.__bits[3]);

                                found = false;
                                for (m = 0;
                                     m < __arraycount(lwpinfo_thread_sigmask);
                                     m++) {
                                        if (sigismember(&sigmask,
                                            lwpinfo_thread_sigmask[m])) {
                                                found = true;
                                                lwpinfo_thread_sigmask[m] = 0;
                                                break;
                                        }
                                }
                                ATF_REQUIRE(found == true);
                        } else if (strstr(iter, "pl_name") != NULL) {
                                name = lwpstatus.pl_name;

                                DPRINTF("Retrieved thread name: "
                                    "%s\n", name);

                                snprintf(namebuf, sizeof namebuf, "thread %d",
                                    lwpstatus.pl_lwpid);

                                ATF_REQUIRE(strcmp(name, namebuf) == 0);
                        } else if (strstr(iter, "pl_private") != NULL) {
                                private = lwpstatus.pl_private;

                                DPRINTF("Retrieved thread private pointer: "
                                    "%p\n", private);

                                found = false;
                                for (m = 0; m < __arraycount(tcb); m++) {
                                        DPRINTF("Comparing %p and %p\n",
                                            private, tcb[m]);
                                        if (private == tcb[m]) {
                                                found = true;
                                                break;
                                        }
                                }
                                ATF_REQUIRE(found == true);
                        }
                }
        }

        if (strstr(iter, "LWPINFO") != NULL) {
                DPRINTF("Before calling ptrace(2) with PT_LWPINFO for "
                    "child\n");
                SYSCALL_REQUIRE(ptrace(PT_LWPINFO, child, &lwp, sizeof(lwp))
                    != -1);
                DPRINTF("LWP=%d\n", lwp.pl_lwpid);

                DPRINTF("Assert that there are no more threads\n");
                ATF_REQUIRE_EQ(lwp.pl_lwpid, 0);
        } else {
                DPRINTF("Before calling ptrace(2) with PT_LWPNEXT for child\n");
                SYSCALL_REQUIRE(ptrace(PT_LWPNEXT, child, &lwpstatus,
                    sizeof(lwpstatus)) != -1);

                DPRINTF("Assert that there exists a single thread only\n");
                ATF_REQUIRE_EQ(lwpstatus.pl_lwpid, 0);
        }

        DPRINTF("Before resuming the child process where it left off and "
            "without signal to be sent\n");
        SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, SIGKILL) != -1);

        DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
        TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

        validate_status_signaled(status, SIGKILL, 0);

        DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
        TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
}

#define TRACEME_LWPINFO(test, threads, iter)                            \
ATF_TC(test);                                                           \
ATF_TC_HEAD(test, tc)                                                   \
{                                                                       \
        atf_tc_set_md_var(tc, "descr",                                  \
            "Verify " iter " with the child with " #threads             \
            " spawned extra threads");                                  \
}                                                                       \
                                                                        \
ATF_TC_BODY(test, tc)                                                   \
{                                                                       \
                                                                        \
        traceme_lwpinfo(threads, iter);                                 \
}

TRACEME_LWPINFO(traceme_lwpinfo0, 0, "LWPINFO")
TRACEME_LWPINFO(traceme_lwpinfo1, 1, "LWPINFO")
TRACEME_LWPINFO(traceme_lwpinfo2, 2, "LWPINFO")
TRACEME_LWPINFO(traceme_lwpinfo3, 3, "LWPINFO")

TRACEME_LWPINFO(traceme_lwpinfo0_lwpstatus, 0, "LWPINFO+LWPSTATUS")
TRACEME_LWPINFO(traceme_lwpinfo1_lwpstatus, 1, "LWPINFO+LWPSTATUS")
TRACEME_LWPINFO(traceme_lwpinfo2_lwpstatus, 2, "LWPINFO+LWPSTATUS")
TRACEME_LWPINFO(traceme_lwpinfo3_lwpstatus, 3, "LWPINFO+LWPSTATUS")

TRACEME_LWPINFO(traceme_lwpinfo0_lwpstatus_pl_sigmask, 0,
    "LWPINFO+LWPSTATUS+pl_sigmask")
TRACEME_LWPINFO(traceme_lwpinfo1_lwpstatus_pl_sigmask, 1,
    "LWPINFO+LWPSTATUS+pl_sigmask")
TRACEME_LWPINFO(traceme_lwpinfo2_lwpstatus_pl_sigmask, 2,
    "LWPINFO+LWPSTATUS+pl_sigmask")
TRACEME_LWPINFO(traceme_lwpinfo3_lwpstatus_pl_sigmask, 3,
    "LWPINFO+LWPSTATUS+pl_sigmask")

TRACEME_LWPINFO(traceme_lwpinfo0_lwpstatus_pl_name, 0,
    "LWPINFO+LWPSTATUS+pl_name")
TRACEME_LWPINFO(traceme_lwpinfo1_lwpstatus_pl_name, 1,
    "LWPINFO+LWPSTATUS+pl_name")
TRACEME_LWPINFO(traceme_lwpinfo2_lwpstatus_pl_name, 2,
    "LWPINFO+LWPSTATUS+pl_name")
TRACEME_LWPINFO(traceme_lwpinfo3_lwpstatus_pl_name, 3,
    "LWPINFO+LWPSTATUS+pl_name")

TRACEME_LWPINFO(traceme_lwpinfo0_lwpstatus_pl_private, 0,
    "LWPINFO+LWPSTATUS+pl_private")
TRACEME_LWPINFO(traceme_lwpinfo1_lwpstatus_pl_private, 1,
    "LWPINFO+LWPSTATUS+pl_private")
TRACEME_LWPINFO(traceme_lwpinfo2_lwpstatus_pl_private, 2,
    "LWPINFO+LWPSTATUS+pl_private")
TRACEME_LWPINFO(traceme_lwpinfo3_lwpstatus_pl_private, 3,
    "LWPINFO+LWPSTATUS+pl_private")

TRACEME_LWPINFO(traceme_lwpnext0, 0, "LWPNEXT")
TRACEME_LWPINFO(traceme_lwpnext1, 1, "LWPNEXT")
TRACEME_LWPINFO(traceme_lwpnext2, 2, "LWPNEXT")
TRACEME_LWPINFO(traceme_lwpnext3, 3, "LWPNEXT")

TRACEME_LWPINFO(traceme_lwpnext0_pl_sigmask, 0, "LWPNEXT+pl_sigmask")
TRACEME_LWPINFO(traceme_lwpnext1_pl_sigmask, 1, "LWPNEXT+pl_sigmask")
TRACEME_LWPINFO(traceme_lwpnext2_pl_sigmask, 2, "LWPNEXT+pl_sigmask")
TRACEME_LWPINFO(traceme_lwpnext3_pl_sigmask, 3, "LWPNEXT+pl_sigmask")

TRACEME_LWPINFO(traceme_lwpnext0_pl_name, 0, "LWPNEXT+pl_name")
TRACEME_LWPINFO(traceme_lwpnext1_pl_name, 1, "LWPNEXT+pl_name")
TRACEME_LWPINFO(traceme_lwpnext2_pl_name, 2, "LWPNEXT+pl_name")
TRACEME_LWPINFO(traceme_lwpnext3_pl_name, 3, "LWPNEXT+pl_name")

TRACEME_LWPINFO(traceme_lwpnext0_pl_private, 0, "LWPNEXT+pl_private")
TRACEME_LWPINFO(traceme_lwpnext1_pl_private, 1, "LWPNEXT+pl_private")
TRACEME_LWPINFO(traceme_lwpnext2_pl_private, 2, "LWPNEXT+pl_private")
TRACEME_LWPINFO(traceme_lwpnext3_pl_private, 3, "LWPNEXT+pl_private")

/// ----------------------------------------------------------------------------

#if defined(TWAIT_HAVE_PID)
static void
attach_lwpinfo(const int threads)
{
        const int sigval = SIGINT;
        struct msg_fds parent_tracee, parent_tracer;
        const int exitval_tracer = 10;
        pid_t tracee, tracer, wpid;
        uint8_t msg = 0xde; /* dummy message for IPC based on pipe(2) */
#if defined(TWAIT_HAVE_STATUS)
        int status;
#endif
        struct ptrace_lwpinfo lwp = {0, 0};
        struct ptrace_siginfo info;

        /* Maximum number of supported threads in this test */
        pthread_t t[3];
        int n, rv;

        DPRINTF("Spawn tracee\n");
        SYSCALL_REQUIRE(msg_open(&parent_tracee) == 0);
        SYSCALL_REQUIRE(msg_open(&parent_tracer) == 0);
        tracee = atf_utils_fork();
        if (tracee == 0) {
                /* Wait for message from the parent */
                CHILD_TO_PARENT("tracee ready", parent_tracee, msg);

                CHILD_FROM_PARENT("spawn threads", parent_tracee, msg);

                for (n = 0; n < threads; n++) {
                        rv = pthread_create(&t[n], NULL, infinite_thread, NULL);
                        FORKEE_ASSERT(rv == 0);
                }

                CHILD_TO_PARENT("tracee exit", parent_tracee, msg);

                DPRINTF("Before raising %s from child\n", strsignal(sigval));
                FORKEE_ASSERT(raise(sigval) == 0);

                /* NOTREACHED */
                FORKEE_ASSERTX(0 && "Not reached");
        }
        PARENT_FROM_CHILD("tracee ready", parent_tracee, msg);

        DPRINTF("Spawn debugger\n");
        tracer = atf_utils_fork();
        if (tracer == 0) {
                /* No IPC to communicate with the child */
                DPRINTF("Before calling PT_ATTACH from tracee %d\n", getpid());
                FORKEE_ASSERT(ptrace(PT_ATTACH, tracee, NULL, 0) != -1);

                /* Wait for tracee and assert that it was stopped w/ SIGSTOP */
                FORKEE_REQUIRE_SUCCESS(
                    wpid = TWAIT_GENERIC(tracee, &status, 0), tracee);

                forkee_status_stopped(status, SIGSTOP);

                DPRINTF("Before calling ptrace(2) with PT_GET_SIGINFO for "
                    "tracee");
                FORKEE_ASSERT(
                    ptrace(PT_GET_SIGINFO, tracee, &info, sizeof(info)) != -1);

                DPRINTF("Signal traced to lwpid=%d\n", info.psi_lwpid);
                DPRINTF("Signal properties: si_signo=%#x si_code=%#x "
                    "si_errno=%#x\n",
                    info.psi_siginfo.si_signo, info.psi_siginfo.si_code,
                    info.psi_siginfo.si_errno);

                FORKEE_ASSERT_EQ(info.psi_siginfo.si_signo, SIGSTOP);
                FORKEE_ASSERT_EQ(info.psi_siginfo.si_code, SI_USER);

                DPRINTF("Before calling ptrace(2) with PT_LWPINFO for child\n");
                FORKEE_ASSERT(ptrace(PT_LWPINFO, tracee, &lwp, sizeof(lwp))
                    != -1);

                DPRINTF("Assert that there exists a thread\n");
                FORKEE_ASSERTX(lwp.pl_lwpid > 0);

                DPRINTF("Assert that lwp thread %d received event "
                    "PL_EVENT_SIGNAL\n", lwp.pl_lwpid);
                FORKEE_ASSERT_EQ(lwp.pl_event, PL_EVENT_SIGNAL);

                DPRINTF("Before calling ptrace(2) with PT_LWPINFO for "
                    "tracee\n");
                FORKEE_ASSERT(ptrace(PT_LWPINFO, tracee, &lwp, sizeof(lwp))
                    != -1);

                DPRINTF("Assert that there are no more lwp threads in "
                    "tracee\n");
                FORKEE_ASSERT_EQ(lwp.pl_lwpid, 0);

                /* Resume tracee with PT_CONTINUE */
                FORKEE_ASSERT(ptrace(PT_CONTINUE, tracee, (void *)1, 0) != -1);

                /* Inform parent that tracer has attached to tracee */
                CHILD_TO_PARENT("tracer ready", parent_tracer, msg);

                /* Wait for parent */
                CHILD_FROM_PARENT("tracer wait", parent_tracer, msg);

                /* Wait for tracee and assert that it raised a signal */
                FORKEE_REQUIRE_SUCCESS(
                    wpid = TWAIT_GENERIC(tracee, &status, 0), tracee);

                forkee_status_stopped(status, SIGINT);

                DPRINTF("Before calling ptrace(2) with PT_GET_SIGINFO for "
                    "child");
                FORKEE_ASSERT(
                    ptrace(PT_GET_SIGINFO, tracee, &info, sizeof(info)) != -1);

                DPRINTF("Signal traced to lwpid=%d\n", info.psi_lwpid);
                DPRINTF("Signal properties: si_signo=%#x si_code=%#x "
                    "si_errno=%#x\n",
                    info.psi_siginfo.si_signo, info.psi_siginfo.si_code,
                    info.psi_siginfo.si_errno);

                FORKEE_ASSERT_EQ(info.psi_siginfo.si_signo, sigval);
                FORKEE_ASSERT_EQ(info.psi_siginfo.si_code, SI_LWP);

                memset(&lwp, 0, sizeof(lwp));

                for (n = 0; n <= threads; n++) {
                        DPRINTF("Before calling ptrace(2) with PT_LWPINFO for "
                            "child\n");
                        FORKEE_ASSERT(ptrace(PT_LWPINFO, tracee, &lwp,
                            sizeof(lwp)) != -1);
                        DPRINTF("LWP=%d\n", lwp.pl_lwpid);

                        DPRINTF("Assert that the thread exists\n");
                        FORKEE_ASSERT(lwp.pl_lwpid > 0);

                        DPRINTF("Assert that lwp thread %d received expected "
                            "event\n", lwp.pl_lwpid);
                        FORKEE_ASSERT_EQ(lwp.pl_event,
                            info.psi_lwpid == lwp.pl_lwpid ?
                            PL_EVENT_SIGNAL : PL_EVENT_NONE);
                }
                DPRINTF("Before calling ptrace(2) with PT_LWPINFO for "
                    "tracee\n");
                FORKEE_ASSERT(ptrace(PT_LWPINFO, tracee, &lwp, sizeof(lwp))
                    != -1);
                DPRINTF("LWP=%d\n", lwp.pl_lwpid);

                DPRINTF("Assert that there are no more threads\n");
                FORKEE_ASSERT_EQ(lwp.pl_lwpid, 0);

                DPRINTF("Before resuming the child process where it left off "
                    "and without signal to be sent\n");
                FORKEE_ASSERT(ptrace(PT_CONTINUE, tracee, (void *)1, SIGKILL)
                    != -1);

                /* Wait for tracee and assert that it exited */
                FORKEE_REQUIRE_SUCCESS(
                    wpid = TWAIT_GENERIC(tracee, &status, 0), tracee);

                forkee_status_signaled(status, SIGKILL, 0);

                DPRINTF("Before exiting of the tracer process\n");
                _exit(exitval_tracer);
        }

        DPRINTF("Wait for the tracer to attach to the tracee\n");
        PARENT_FROM_CHILD("tracer ready", parent_tracer, msg);

        DPRINTF("Resume the tracee and spawn threads\n");
        PARENT_TO_CHILD("spawn threads", parent_tracee, msg);

        DPRINTF("Resume the tracee and let it exit\n");
        PARENT_FROM_CHILD("tracee exit", parent_tracee, msg);

        DPRINTF("Resume the tracer and let it detect multiple threads\n");
        PARENT_TO_CHILD("tracer wait", parent_tracer, msg);

        DPRINTF("Wait for tracer to finish its job and exit - calling %s()\n",
            TWAIT_FNAME);
        TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(tracer, &status, 0),
            tracer);

        validate_status_exited(status, exitval_tracer);

        DPRINTF("Wait for tracee to finish its job and exit - calling %s()\n",
            TWAIT_FNAME);
        TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(tracee, &status, WNOHANG),
            tracee);

        validate_status_signaled(status, SIGKILL, 0);

        msg_close(&parent_tracer);
        msg_close(&parent_tracee);
}

#define ATTACH_LWPINFO(test, threads)                                   \
ATF_TC(test);                                                           \
ATF_TC_HEAD(test, tc)                                                   \
{                                                                       \
        atf_tc_set_md_var(tc, "descr",                                  \
            "Verify LWPINFO with the child with " #threads              \
            " spawned extra threads (tracer is not the original "       \
            "parent)");                                                 \
}                                                                       \
                                                                        \
ATF_TC_BODY(test, tc)                                                   \
{                                                                       \
                                                                        \
        attach_lwpinfo(threads);                                        \
}

ATTACH_LWPINFO(attach_lwpinfo0, 0)
ATTACH_LWPINFO(attach_lwpinfo1, 1)
ATTACH_LWPINFO(attach_lwpinfo2, 2)
ATTACH_LWPINFO(attach_lwpinfo3, 3)
#endif

#define ATF_TP_ADD_TCS_PTRACE_WAIT_LWP() \
        ATF_TP_ADD_TC(tp, traceme_lwpinfo0); \
        ATF_TP_ADD_TC(tp, traceme_lwpinfo1); \
        ATF_TP_ADD_TC(tp, traceme_lwpinfo2); \
        ATF_TP_ADD_TC(tp, traceme_lwpinfo3); \
        ATF_TP_ADD_TC(tp, traceme_lwpinfo0_lwpstatus); \
        ATF_TP_ADD_TC(tp, traceme_lwpinfo1_lwpstatus); \
        ATF_TP_ADD_TC(tp, traceme_lwpinfo2_lwpstatus); \
        ATF_TP_ADD_TC(tp, traceme_lwpinfo3_lwpstatus); \
        ATF_TP_ADD_TC(tp, traceme_lwpinfo0_lwpstatus_pl_sigmask); \
        ATF_TP_ADD_TC(tp, traceme_lwpinfo1_lwpstatus_pl_sigmask); \
        ATF_TP_ADD_TC(tp, traceme_lwpinfo2_lwpstatus_pl_sigmask); \
        ATF_TP_ADD_TC(tp, traceme_lwpinfo3_lwpstatus_pl_sigmask); \
        ATF_TP_ADD_TC(tp, traceme_lwpinfo0_lwpstatus_pl_name); \
        ATF_TP_ADD_TC(tp, traceme_lwpinfo1_lwpstatus_pl_name); \
        ATF_TP_ADD_TC(tp, traceme_lwpinfo2_lwpstatus_pl_name); \
        ATF_TP_ADD_TC(tp, traceme_lwpinfo3_lwpstatus_pl_name); \
        ATF_TP_ADD_TC(tp, traceme_lwpinfo0_lwpstatus_pl_private); \
        ATF_TP_ADD_TC(tp, traceme_lwpinfo1_lwpstatus_pl_private); \
        ATF_TP_ADD_TC(tp, traceme_lwpinfo2_lwpstatus_pl_private); \
        ATF_TP_ADD_TC(tp, traceme_lwpinfo3_lwpstatus_pl_private); \
        ATF_TP_ADD_TC(tp, traceme_lwpnext0); \
        ATF_TP_ADD_TC(tp, traceme_lwpnext1); \
        ATF_TP_ADD_TC(tp, traceme_lwpnext2); \
        ATF_TP_ADD_TC(tp, traceme_lwpnext3); \
        ATF_TP_ADD_TC(tp, traceme_lwpnext0_pl_sigmask); \
        ATF_TP_ADD_TC(tp, traceme_lwpnext1_pl_sigmask); \
        ATF_TP_ADD_TC(tp, traceme_lwpnext2_pl_sigmask); \
        ATF_TP_ADD_TC(tp, traceme_lwpnext3_pl_sigmask); \
        ATF_TP_ADD_TC(tp, traceme_lwpnext0_pl_name); \
        ATF_TP_ADD_TC(tp, traceme_lwpnext1_pl_name); \
        ATF_TP_ADD_TC(tp, traceme_lwpnext2_pl_name); \
        ATF_TP_ADD_TC(tp, traceme_lwpnext3_pl_name); \
        ATF_TP_ADD_TC(tp, traceme_lwpnext0_pl_private); \
        ATF_TP_ADD_TC(tp, traceme_lwpnext1_pl_private); \
        ATF_TP_ADD_TC(tp, traceme_lwpnext2_pl_private); \
        ATF_TP_ADD_TC(tp, traceme_lwpnext3_pl_private); \
        ATF_TP_ADD_TC_HAVE_PID(tp, attach_lwpinfo0); \
        ATF_TP_ADD_TC_HAVE_PID(tp, attach_lwpinfo1); \
        ATF_TP_ADD_TC_HAVE_PID(tp, attach_lwpinfo2); \
        ATF_TP_ADD_TC_HAVE_PID(tp, attach_lwpinfo3);