368b2b1c76
getppid() after a debugger process that is not the parent has attached. Reviewed by: kib (earlier version) Differential Revision: https://reviews.freebsd.org/D3615
974 lines
26 KiB
C
974 lines
26 KiB
C
/*-
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* Copyright (c) 2015 John Baldwin <jhb@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/ptrace.h>
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#include <sys/sysctl.h>
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#include <sys/user.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <atf-c.h>
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/*
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* A variant of ATF_REQUIRE that is suitable for use in child
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* processes. This only works if the parent process is tripped up by
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* the early exit and fails some requirement itself.
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*/
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#define CHILD_REQUIRE(exp) do { \
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if (!(exp)) \
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child_fail_require(__FILE__, __LINE__, \
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#exp " not met"); \
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} while (0)
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static __dead2 void
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child_fail_require(const char *file, int line, const char *str)
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{
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char buf[128];
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snprintf(buf, sizeof(buf), "%s:%d: %s\n", file, line, str);
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write(2, buf, strlen(buf));
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_exit(32);
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}
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static void
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trace_me(void)
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{
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/* Attach the parent process as a tracer of this process. */
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CHILD_REQUIRE(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);
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/* Trigger a stop. */
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raise(SIGSTOP);
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}
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static void
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attach_child(pid_t pid)
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{
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pid_t wpid;
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int status;
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ATF_REQUIRE(ptrace(PT_ATTACH, pid, NULL, 0) == 0);
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wpid = waitpid(pid, &status, 0);
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ATF_REQUIRE(wpid == pid);
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ATF_REQUIRE(WIFSTOPPED(status));
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ATF_REQUIRE(WSTOPSIG(status) == SIGSTOP);
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}
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static void
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wait_for_zombie(pid_t pid)
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{
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/*
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* Wait for a process to exit. This is kind of gross, but
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* there is not a better way.
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*/
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for (;;) {
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struct kinfo_proc kp;
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size_t len;
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int mib[4];
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mib[0] = CTL_KERN;
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mib[1] = KERN_PROC;
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mib[2] = KERN_PROC_PID;
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mib[3] = pid;
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len = sizeof(kp);
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if (sysctl(mib, nitems(mib), &kp, &len, NULL, 0) == -1) {
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/* The KERN_PROC_PID sysctl fails for zombies. */
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ATF_REQUIRE(errno == ESRCH);
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break;
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}
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usleep(5000);
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}
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}
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/*
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* Verify that a parent debugger process "sees" the exit of a debugged
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* process exactly once when attached via PT_TRACE_ME.
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*/
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ATF_TC_WITHOUT_HEAD(ptrace__parent_wait_after_trace_me);
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ATF_TC_BODY(ptrace__parent_wait_after_trace_me, tc)
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{
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pid_t child, wpid;
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int status;
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ATF_REQUIRE((child = fork()) != -1);
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if (child == 0) {
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/* Child process. */
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trace_me();
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exit(1);
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}
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/* Parent process. */
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/* The first wait() should report the stop from SIGSTOP. */
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wpid = waitpid(child, &status, 0);
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ATF_REQUIRE(wpid == child);
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ATF_REQUIRE(WIFSTOPPED(status));
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ATF_REQUIRE(WSTOPSIG(status) == SIGSTOP);
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/* Continue the child ignoring the SIGSTOP. */
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ATF_REQUIRE(ptrace(PT_CONTINUE, child, (caddr_t)1, 0) != -1);
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/* The second wait() should report the exit status. */
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wpid = waitpid(child, &status, 0);
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ATF_REQUIRE(wpid == child);
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ATF_REQUIRE(WIFEXITED(status));
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ATF_REQUIRE(WEXITSTATUS(status) == 1);
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/* The child should no longer exist. */
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wpid = waitpid(child, &status, 0);
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ATF_REQUIRE(wpid == -1);
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ATF_REQUIRE(errno == ECHILD);
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}
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/*
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* Verify that a parent debugger process "sees" the exit of a debugged
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* process exactly once when attached via PT_ATTACH.
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*/
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ATF_TC_WITHOUT_HEAD(ptrace__parent_wait_after_attach);
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ATF_TC_BODY(ptrace__parent_wait_after_attach, tc)
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{
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pid_t child, wpid;
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int cpipe[2], status;
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char c;
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ATF_REQUIRE(pipe(cpipe) == 0);
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ATF_REQUIRE((child = fork()) != -1);
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if (child == 0) {
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/* Child process. */
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close(cpipe[0]);
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/* Wait for the parent to attach. */
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CHILD_REQUIRE(read(cpipe[1], &c, sizeof(c)) == 0);
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exit(1);
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}
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close(cpipe[1]);
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/* Parent process. */
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/* Attach to the child process. */
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attach_child(child);
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/* Continue the child ignoring the SIGSTOP. */
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ATF_REQUIRE(ptrace(PT_CONTINUE, child, (caddr_t)1, 0) != -1);
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/* Signal the child to exit. */
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close(cpipe[0]);
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/* The second wait() should report the exit status. */
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wpid = waitpid(child, &status, 0);
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ATF_REQUIRE(wpid == child);
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ATF_REQUIRE(WIFEXITED(status));
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ATF_REQUIRE(WEXITSTATUS(status) == 1);
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/* The child should no longer exist. */
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wpid = waitpid(child, &status, 0);
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ATF_REQUIRE(wpid == -1);
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ATF_REQUIRE(errno == ECHILD);
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}
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/*
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* Verify that a parent process "sees" the exit of a debugged process only
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* after the debugger has seen it.
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*/
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ATF_TC_WITHOUT_HEAD(ptrace__parent_sees_exit_after_child_debugger);
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ATF_TC_BODY(ptrace__parent_sees_exit_after_child_debugger, tc)
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{
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pid_t child, debugger, wpid;
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int cpipe[2], dpipe[2], status;
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char c;
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ATF_REQUIRE(pipe(cpipe) == 0);
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ATF_REQUIRE((child = fork()) != -1);
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if (child == 0) {
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/* Child process. */
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close(cpipe[0]);
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/* Wait for parent to be ready. */
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CHILD_REQUIRE(read(cpipe[1], &c, sizeof(c)) == sizeof(c));
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exit(1);
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}
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close(cpipe[1]);
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ATF_REQUIRE(pipe(dpipe) == 0);
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ATF_REQUIRE((debugger = fork()) != -1);
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if (debugger == 0) {
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/* Debugger process. */
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close(dpipe[0]);
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CHILD_REQUIRE(ptrace(PT_ATTACH, child, NULL, 0) != -1);
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wpid = waitpid(child, &status, 0);
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CHILD_REQUIRE(wpid == child);
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CHILD_REQUIRE(WIFSTOPPED(status));
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CHILD_REQUIRE(WSTOPSIG(status) == SIGSTOP);
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CHILD_REQUIRE(ptrace(PT_CONTINUE, child, (caddr_t)1, 0) != -1);
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/* Signal parent that debugger is attached. */
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CHILD_REQUIRE(write(dpipe[1], &c, sizeof(c)) == sizeof(c));
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/* Wait for parent's failed wait. */
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CHILD_REQUIRE(read(dpipe[1], &c, sizeof(c)) == 0);
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wpid = waitpid(child, &status, 0);
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CHILD_REQUIRE(wpid == child);
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CHILD_REQUIRE(WIFEXITED(status));
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CHILD_REQUIRE(WEXITSTATUS(status) == 1);
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exit(0);
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}
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close(dpipe[1]);
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/* Parent process. */
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/* Wait for the debugger to attach to the child. */
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ATF_REQUIRE(read(dpipe[0], &c, sizeof(c)) == sizeof(c));
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/* Release the child. */
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ATF_REQUIRE(write(cpipe[0], &c, sizeof(c)) == sizeof(c));
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ATF_REQUIRE(read(cpipe[0], &c, sizeof(c)) == 0);
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close(cpipe[0]);
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wait_for_zombie(child);
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/*
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* This wait should return a pid of 0 to indicate no status to
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* report. The parent should see the child as non-exited
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* until the debugger sees the exit.
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*/
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wpid = waitpid(child, &status, WNOHANG);
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ATF_REQUIRE(wpid == 0);
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/* Signal the debugger to wait for the child. */
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close(dpipe[0]);
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/* Wait for the debugger. */
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wpid = waitpid(debugger, &status, 0);
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ATF_REQUIRE(wpid == debugger);
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ATF_REQUIRE(WIFEXITED(status));
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ATF_REQUIRE(WEXITSTATUS(status) == 0);
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/* The child process should now be ready. */
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wpid = waitpid(child, &status, WNOHANG);
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ATF_REQUIRE(wpid == child);
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ATF_REQUIRE(WIFEXITED(status));
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ATF_REQUIRE(WEXITSTATUS(status) == 1);
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}
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/*
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* Verify that a parent process "sees" the exit of a debugged process
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* only after a non-direct-child debugger has seen it. In particular,
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* various wait() calls in the parent must avoid failing with ESRCH by
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* checking the parent's orphan list for the debugee.
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*/
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ATF_TC_WITHOUT_HEAD(ptrace__parent_sees_exit_after_unrelated_debugger);
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ATF_TC_BODY(ptrace__parent_sees_exit_after_unrelated_debugger, tc)
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{
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pid_t child, debugger, fpid, wpid;
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int cpipe[2], dpipe[2], status;
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char c;
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ATF_REQUIRE(pipe(cpipe) == 0);
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ATF_REQUIRE((child = fork()) != -1);
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if (child == 0) {
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/* Child process. */
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close(cpipe[0]);
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/* Wait for parent to be ready. */
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CHILD_REQUIRE(read(cpipe[1], &c, sizeof(c)) == sizeof(c));
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exit(1);
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}
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close(cpipe[1]);
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ATF_REQUIRE(pipe(dpipe) == 0);
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ATF_REQUIRE((debugger = fork()) != -1);
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if (debugger == 0) {
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/* Debugger parent. */
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/*
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* Fork again and drop the debugger parent so that the
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* debugger is not a child of the main parent.
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*/
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CHILD_REQUIRE((fpid = fork()) != -1);
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if (fpid != 0)
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exit(2);
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/* Debugger process. */
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close(dpipe[0]);
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CHILD_REQUIRE(ptrace(PT_ATTACH, child, NULL, 0) != -1);
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wpid = waitpid(child, &status, 0);
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CHILD_REQUIRE(wpid == child);
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CHILD_REQUIRE(WIFSTOPPED(status));
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CHILD_REQUIRE(WSTOPSIG(status) == SIGSTOP);
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CHILD_REQUIRE(ptrace(PT_CONTINUE, child, (caddr_t)1, 0) != -1);
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/* Signal parent that debugger is attached. */
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CHILD_REQUIRE(write(dpipe[1], &c, sizeof(c)) == sizeof(c));
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/* Wait for parent's failed wait. */
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CHILD_REQUIRE(read(dpipe[1], &c, sizeof(c)) == sizeof(c));
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wpid = waitpid(child, &status, 0);
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CHILD_REQUIRE(wpid == child);
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CHILD_REQUIRE(WIFEXITED(status));
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CHILD_REQUIRE(WEXITSTATUS(status) == 1);
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exit(0);
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}
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close(dpipe[1]);
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/* Parent process. */
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/* Wait for the debugger parent process to exit. */
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wpid = waitpid(debugger, &status, 0);
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ATF_REQUIRE(wpid == debugger);
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ATF_REQUIRE(WIFEXITED(status));
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ATF_REQUIRE(WEXITSTATUS(status) == 2);
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/* A WNOHANG wait here should see the non-exited child. */
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wpid = waitpid(child, &status, WNOHANG);
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ATF_REQUIRE(wpid == 0);
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/* Wait for the debugger to attach to the child. */
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ATF_REQUIRE(read(dpipe[0], &c, sizeof(c)) == sizeof(c));
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/* Release the child. */
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ATF_REQUIRE(write(cpipe[0], &c, sizeof(c)) == sizeof(c));
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ATF_REQUIRE(read(cpipe[0], &c, sizeof(c)) == 0);
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close(cpipe[0]);
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wait_for_zombie(child);
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/*
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* This wait should return a pid of 0 to indicate no status to
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* report. The parent should see the child as non-exited
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* until the debugger sees the exit.
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*/
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wpid = waitpid(child, &status, WNOHANG);
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ATF_REQUIRE(wpid == 0);
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/* Signal the debugger to wait for the child. */
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ATF_REQUIRE(write(dpipe[0], &c, sizeof(c)) == sizeof(c));
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/* Wait for the debugger. */
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ATF_REQUIRE(read(dpipe[0], &c, sizeof(c)) == 0);
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close(dpipe[0]);
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/* The child process should now be ready. */
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wpid = waitpid(child, &status, WNOHANG);
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ATF_REQUIRE(wpid == child);
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ATF_REQUIRE(WIFEXITED(status));
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ATF_REQUIRE(WEXITSTATUS(status) == 1);
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}
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/*
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* The parent process should always act the same regardless of how the
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* debugger is attached to it.
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*/
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static __dead2 void
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follow_fork_parent(void)
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{
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pid_t fpid, wpid;
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int status;
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CHILD_REQUIRE((fpid = fork()) != -1);
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if (fpid == 0)
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/* Child */
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exit(2);
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wpid = waitpid(fpid, &status, 0);
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CHILD_REQUIRE(wpid == fpid);
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CHILD_REQUIRE(WIFEXITED(status));
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CHILD_REQUIRE(WEXITSTATUS(status) == 2);
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exit(1);
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}
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/*
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* Helper routine for follow fork tests. This waits for two stops
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* that report both "sides" of a fork. It returns the pid of the new
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* child process.
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*/
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static pid_t
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handle_fork_events(pid_t parent)
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{
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struct ptrace_lwpinfo pl;
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bool fork_reported[2];
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pid_t child, wpid;
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int i, status;
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fork_reported[0] = false;
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fork_reported[1] = false;
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child = -1;
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/*
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* Each process should report a fork event. The parent should
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* report a PL_FLAG_FORKED event, and the child should report
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* a PL_FLAG_CHILD event.
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*/
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for (i = 0; i < 2; i++) {
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wpid = wait(&status);
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ATF_REQUIRE(wpid > 0);
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ATF_REQUIRE(WIFSTOPPED(status));
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ATF_REQUIRE(ptrace(PT_LWPINFO, wpid, (caddr_t)&pl,
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sizeof(pl)) != -1);
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ATF_REQUIRE((pl.pl_flags & (PL_FLAG_FORKED | PL_FLAG_CHILD)) !=
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0);
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ATF_REQUIRE((pl.pl_flags & (PL_FLAG_FORKED | PL_FLAG_CHILD)) !=
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(PL_FLAG_FORKED | PL_FLAG_CHILD));
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if (pl.pl_flags & PL_FLAG_CHILD) {
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ATF_REQUIRE(wpid != parent);
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ATF_REQUIRE(WSTOPSIG(status) == SIGSTOP);
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ATF_REQUIRE(!fork_reported[1]);
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if (child == -1)
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child = wpid;
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else
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ATF_REQUIRE(child == wpid);
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fork_reported[1] = true;
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} else {
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ATF_REQUIRE(wpid == parent);
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ATF_REQUIRE(WSTOPSIG(status) == SIGTRAP);
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ATF_REQUIRE(!fork_reported[0]);
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if (child == -1)
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child = pl.pl_child_pid;
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else
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ATF_REQUIRE(child == pl.pl_child_pid);
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fork_reported[0] = true;
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}
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}
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return (child);
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}
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|
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/*
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* Verify that a new child process is stopped after a followed fork and
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* that the traced parent sees the exit of the child after the debugger
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* when both processes remain attached to the debugger.
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*/
|
|
ATF_TC_WITHOUT_HEAD(ptrace__follow_fork_both_attached);
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ATF_TC_BODY(ptrace__follow_fork_both_attached, tc)
|
|
{
|
|
pid_t children[2], fpid, wpid;
|
|
int status;
|
|
|
|
ATF_REQUIRE((fpid = fork()) != -1);
|
|
if (fpid == 0) {
|
|
trace_me();
|
|
follow_fork_parent();
|
|
}
|
|
|
|
/* Parent process. */
|
|
children[0] = fpid;
|
|
|
|
/* The first wait() should report the stop from SIGSTOP. */
|
|
wpid = waitpid(children[0], &status, 0);
|
|
ATF_REQUIRE(wpid == children[0]);
|
|
ATF_REQUIRE(WIFSTOPPED(status));
|
|
ATF_REQUIRE(WSTOPSIG(status) == SIGSTOP);
|
|
|
|
ATF_REQUIRE(ptrace(PT_FOLLOW_FORK, children[0], NULL, 1) != -1);
|
|
|
|
/* Continue the child ignoring the SIGSTOP. */
|
|
ATF_REQUIRE(ptrace(PT_CONTINUE, children[0], (caddr_t)1, 0) != -1);
|
|
|
|
children[1] = handle_fork_events(children[0]);
|
|
ATF_REQUIRE(children[1] > 0);
|
|
|
|
ATF_REQUIRE(ptrace(PT_CONTINUE, children[0], (caddr_t)1, 0) != -1);
|
|
ATF_REQUIRE(ptrace(PT_CONTINUE, children[1], (caddr_t)1, 0) != -1);
|
|
|
|
/*
|
|
* The child can't exit until the grandchild reports status, so the
|
|
* grandchild should report its exit first to the debugger.
|
|
*/
|
|
wpid = wait(&status);
|
|
ATF_REQUIRE(wpid == children[1]);
|
|
ATF_REQUIRE(WIFEXITED(status));
|
|
ATF_REQUIRE(WEXITSTATUS(status) == 2);
|
|
|
|
wpid = wait(&status);
|
|
ATF_REQUIRE(wpid == children[0]);
|
|
ATF_REQUIRE(WIFEXITED(status));
|
|
ATF_REQUIRE(WEXITSTATUS(status) == 1);
|
|
|
|
wpid = wait(&status);
|
|
ATF_REQUIRE(wpid == -1);
|
|
ATF_REQUIRE(errno == ECHILD);
|
|
}
|
|
|
|
/*
|
|
* Verify that a new child process is stopped after a followed fork
|
|
* and that the traced parent sees the exit of the child when the new
|
|
* child process is detached after it reports its fork.
|
|
*/
|
|
ATF_TC_WITHOUT_HEAD(ptrace__follow_fork_child_detached);
|
|
ATF_TC_BODY(ptrace__follow_fork_child_detached, tc)
|
|
{
|
|
pid_t children[2], fpid, wpid;
|
|
int status;
|
|
|
|
ATF_REQUIRE((fpid = fork()) != -1);
|
|
if (fpid == 0) {
|
|
trace_me();
|
|
follow_fork_parent();
|
|
}
|
|
|
|
/* Parent process. */
|
|
children[0] = fpid;
|
|
|
|
/* The first wait() should report the stop from SIGSTOP. */
|
|
wpid = waitpid(children[0], &status, 0);
|
|
ATF_REQUIRE(wpid == children[0]);
|
|
ATF_REQUIRE(WIFSTOPPED(status));
|
|
ATF_REQUIRE(WSTOPSIG(status) == SIGSTOP);
|
|
|
|
ATF_REQUIRE(ptrace(PT_FOLLOW_FORK, children[0], NULL, 1) != -1);
|
|
|
|
/* Continue the child ignoring the SIGSTOP. */
|
|
ATF_REQUIRE(ptrace(PT_CONTINUE, children[0], (caddr_t)1, 0) != -1);
|
|
|
|
children[1] = handle_fork_events(children[0]);
|
|
ATF_REQUIRE(children[1] > 0);
|
|
|
|
ATF_REQUIRE(ptrace(PT_CONTINUE, children[0], (caddr_t)1, 0) != -1);
|
|
ATF_REQUIRE(ptrace(PT_DETACH, children[1], (caddr_t)1, 0) != -1);
|
|
|
|
/*
|
|
* Should not see any status from the grandchild now, only the
|
|
* child.
|
|
*/
|
|
wpid = wait(&status);
|
|
ATF_REQUIRE(wpid == children[0]);
|
|
ATF_REQUIRE(WIFEXITED(status));
|
|
ATF_REQUIRE(WEXITSTATUS(status) == 1);
|
|
|
|
wpid = wait(&status);
|
|
ATF_REQUIRE(wpid == -1);
|
|
ATF_REQUIRE(errno == ECHILD);
|
|
}
|
|
|
|
/*
|
|
* Verify that a new child process is stopped after a followed fork
|
|
* and that the traced parent sees the exit of the child when the
|
|
* traced parent is detached after the fork.
|
|
*/
|
|
ATF_TC_WITHOUT_HEAD(ptrace__follow_fork_parent_detached);
|
|
ATF_TC_BODY(ptrace__follow_fork_parent_detached, tc)
|
|
{
|
|
pid_t children[2], fpid, wpid;
|
|
int status;
|
|
|
|
ATF_REQUIRE((fpid = fork()) != -1);
|
|
if (fpid == 0) {
|
|
trace_me();
|
|
follow_fork_parent();
|
|
}
|
|
|
|
/* Parent process. */
|
|
children[0] = fpid;
|
|
|
|
/* The first wait() should report the stop from SIGSTOP. */
|
|
wpid = waitpid(children[0], &status, 0);
|
|
ATF_REQUIRE(wpid == children[0]);
|
|
ATF_REQUIRE(WIFSTOPPED(status));
|
|
ATF_REQUIRE(WSTOPSIG(status) == SIGSTOP);
|
|
|
|
ATF_REQUIRE(ptrace(PT_FOLLOW_FORK, children[0], NULL, 1) != -1);
|
|
|
|
/* Continue the child ignoring the SIGSTOP. */
|
|
ATF_REQUIRE(ptrace(PT_CONTINUE, children[0], (caddr_t)1, 0) != -1);
|
|
|
|
children[1] = handle_fork_events(children[0]);
|
|
ATF_REQUIRE(children[1] > 0);
|
|
|
|
ATF_REQUIRE(ptrace(PT_DETACH, children[0], (caddr_t)1, 0) != -1);
|
|
ATF_REQUIRE(ptrace(PT_CONTINUE, children[1], (caddr_t)1, 0) != -1);
|
|
|
|
/*
|
|
* The child can't exit until the grandchild reports status, so the
|
|
* grandchild should report its exit first to the debugger.
|
|
*
|
|
* Even though the child process is detached, it is still a
|
|
* child of the debugger, so it will still report it's exit
|
|
* after the grandchild.
|
|
*/
|
|
wpid = wait(&status);
|
|
ATF_REQUIRE(wpid == children[1]);
|
|
ATF_REQUIRE(WIFEXITED(status));
|
|
ATF_REQUIRE(WEXITSTATUS(status) == 2);
|
|
|
|
wpid = wait(&status);
|
|
ATF_REQUIRE(wpid == children[0]);
|
|
ATF_REQUIRE(WIFEXITED(status));
|
|
ATF_REQUIRE(WEXITSTATUS(status) == 1);
|
|
|
|
wpid = wait(&status);
|
|
ATF_REQUIRE(wpid == -1);
|
|
ATF_REQUIRE(errno == ECHILD);
|
|
}
|
|
|
|
static void
|
|
attach_fork_parent(int cpipe[2])
|
|
{
|
|
pid_t fpid;
|
|
|
|
close(cpipe[0]);
|
|
|
|
/* Double-fork to disassociate from the debugger. */
|
|
CHILD_REQUIRE((fpid = fork()) != -1);
|
|
if (fpid != 0)
|
|
exit(3);
|
|
|
|
/* Send the pid of the disassociated child to the debugger. */
|
|
fpid = getpid();
|
|
CHILD_REQUIRE(write(cpipe[1], &fpid, sizeof(fpid)) == sizeof(fpid));
|
|
|
|
/* Wait for the debugger to attach. */
|
|
CHILD_REQUIRE(read(cpipe[1], &fpid, sizeof(fpid)) == 0);
|
|
}
|
|
|
|
/*
|
|
* Verify that a new child process is stopped after a followed fork and
|
|
* that the traced parent sees the exit of the child after the debugger
|
|
* when both processes remain attached to the debugger. In this test
|
|
* the parent that forks is not a direct child of the debugger.
|
|
*/
|
|
ATF_TC_WITHOUT_HEAD(ptrace__follow_fork_both_attached_unrelated_debugger);
|
|
ATF_TC_BODY(ptrace__follow_fork_both_attached_unrelated_debugger, tc)
|
|
{
|
|
pid_t children[2], fpid, wpid;
|
|
int cpipe[2], status;
|
|
|
|
ATF_REQUIRE(pipe(cpipe) == 0);
|
|
ATF_REQUIRE((fpid = fork()) != -1);
|
|
if (fpid == 0) {
|
|
attach_fork_parent(cpipe);
|
|
follow_fork_parent();
|
|
}
|
|
|
|
/* Parent process. */
|
|
close(cpipe[1]);
|
|
|
|
/* Wait for the direct child to exit. */
|
|
wpid = waitpid(fpid, &status, 0);
|
|
ATF_REQUIRE(wpid == fpid);
|
|
ATF_REQUIRE(WIFEXITED(status));
|
|
ATF_REQUIRE(WEXITSTATUS(status) == 3);
|
|
|
|
/* Read the pid of the fork parent. */
|
|
ATF_REQUIRE(read(cpipe[0], &children[0], sizeof(children[0])) ==
|
|
sizeof(children[0]));
|
|
|
|
/* Attach to the fork parent. */
|
|
attach_child(children[0]);
|
|
|
|
ATF_REQUIRE(ptrace(PT_FOLLOW_FORK, children[0], NULL, 1) != -1);
|
|
|
|
/* Continue the fork parent ignoring the SIGSTOP. */
|
|
ATF_REQUIRE(ptrace(PT_CONTINUE, children[0], (caddr_t)1, 0) != -1);
|
|
|
|
/* Signal the fork parent to continue. */
|
|
close(cpipe[0]);
|
|
|
|
children[1] = handle_fork_events(children[0]);
|
|
ATF_REQUIRE(children[1] > 0);
|
|
|
|
ATF_REQUIRE(ptrace(PT_CONTINUE, children[0], (caddr_t)1, 0) != -1);
|
|
ATF_REQUIRE(ptrace(PT_CONTINUE, children[1], (caddr_t)1, 0) != -1);
|
|
|
|
/*
|
|
* The fork parent can't exit until the child reports status,
|
|
* so the child should report its exit first to the debugger.
|
|
*/
|
|
wpid = wait(&status);
|
|
ATF_REQUIRE(wpid == children[1]);
|
|
ATF_REQUIRE(WIFEXITED(status));
|
|
ATF_REQUIRE(WEXITSTATUS(status) == 2);
|
|
|
|
wpid = wait(&status);
|
|
ATF_REQUIRE(wpid == children[0]);
|
|
ATF_REQUIRE(WIFEXITED(status));
|
|
ATF_REQUIRE(WEXITSTATUS(status) == 1);
|
|
|
|
wpid = wait(&status);
|
|
ATF_REQUIRE(wpid == -1);
|
|
ATF_REQUIRE(errno == ECHILD);
|
|
}
|
|
|
|
/*
|
|
* Verify that a new child process is stopped after a followed fork
|
|
* and that the traced parent sees the exit of the child when the new
|
|
* child process is detached after it reports its fork. In this test
|
|
* the parent that forks is not a direct child of the debugger.
|
|
*/
|
|
ATF_TC_WITHOUT_HEAD(ptrace__follow_fork_child_detached_unrelated_debugger);
|
|
ATF_TC_BODY(ptrace__follow_fork_child_detached_unrelated_debugger, tc)
|
|
{
|
|
pid_t children[2], fpid, wpid;
|
|
int cpipe[2], status;
|
|
|
|
ATF_REQUIRE(pipe(cpipe) == 0);
|
|
ATF_REQUIRE((fpid = fork()) != -1);
|
|
if (fpid == 0) {
|
|
attach_fork_parent(cpipe);
|
|
follow_fork_parent();
|
|
}
|
|
|
|
/* Parent process. */
|
|
close(cpipe[1]);
|
|
|
|
/* Wait for the direct child to exit. */
|
|
wpid = waitpid(fpid, &status, 0);
|
|
ATF_REQUIRE(wpid == fpid);
|
|
ATF_REQUIRE(WIFEXITED(status));
|
|
ATF_REQUIRE(WEXITSTATUS(status) == 3);
|
|
|
|
/* Read the pid of the fork parent. */
|
|
ATF_REQUIRE(read(cpipe[0], &children[0], sizeof(children[0])) ==
|
|
sizeof(children[0]));
|
|
|
|
/* Attach to the fork parent. */
|
|
attach_child(children[0]);
|
|
|
|
ATF_REQUIRE(ptrace(PT_FOLLOW_FORK, children[0], NULL, 1) != -1);
|
|
|
|
/* Continue the fork parent ignoring the SIGSTOP. */
|
|
ATF_REQUIRE(ptrace(PT_CONTINUE, children[0], (caddr_t)1, 0) != -1);
|
|
|
|
/* Signal the fork parent to continue. */
|
|
close(cpipe[0]);
|
|
|
|
children[1] = handle_fork_events(children[0]);
|
|
ATF_REQUIRE(children[1] > 0);
|
|
|
|
ATF_REQUIRE(ptrace(PT_CONTINUE, children[0], (caddr_t)1, 0) != -1);
|
|
ATF_REQUIRE(ptrace(PT_DETACH, children[1], (caddr_t)1, 0) != -1);
|
|
|
|
/*
|
|
* Should not see any status from the child now, only the fork
|
|
* parent.
|
|
*/
|
|
wpid = wait(&status);
|
|
ATF_REQUIRE(wpid == children[0]);
|
|
ATF_REQUIRE(WIFEXITED(status));
|
|
ATF_REQUIRE(WEXITSTATUS(status) == 1);
|
|
|
|
wpid = wait(&status);
|
|
ATF_REQUIRE(wpid == -1);
|
|
ATF_REQUIRE(errno == ECHILD);
|
|
}
|
|
|
|
/*
|
|
* Verify that a new child process is stopped after a followed fork
|
|
* and that the traced parent sees the exit of the child when the
|
|
* traced parent is detached after the fork. In this test the parent
|
|
* that forks is not a direct child of the debugger.
|
|
*/
|
|
ATF_TC_WITHOUT_HEAD(ptrace__follow_fork_parent_detached_unrelated_debugger);
|
|
ATF_TC_BODY(ptrace__follow_fork_parent_detached_unrelated_debugger, tc)
|
|
{
|
|
pid_t children[2], fpid, wpid;
|
|
int cpipe[2], status;
|
|
|
|
ATF_REQUIRE(pipe(cpipe) == 0);
|
|
ATF_REQUIRE((fpid = fork()) != -1);
|
|
if (fpid == 0) {
|
|
attach_fork_parent(cpipe);
|
|
follow_fork_parent();
|
|
}
|
|
|
|
/* Parent process. */
|
|
close(cpipe[1]);
|
|
|
|
/* Wait for the direct child to exit. */
|
|
wpid = waitpid(fpid, &status, 0);
|
|
ATF_REQUIRE(wpid == fpid);
|
|
ATF_REQUIRE(WIFEXITED(status));
|
|
ATF_REQUIRE(WEXITSTATUS(status) == 3);
|
|
|
|
/* Read the pid of the fork parent. */
|
|
ATF_REQUIRE(read(cpipe[0], &children[0], sizeof(children[0])) ==
|
|
sizeof(children[0]));
|
|
|
|
/* Attach to the fork parent. */
|
|
attach_child(children[0]);
|
|
|
|
ATF_REQUIRE(ptrace(PT_FOLLOW_FORK, children[0], NULL, 1) != -1);
|
|
|
|
/* Continue the fork parent ignoring the SIGSTOP. */
|
|
ATF_REQUIRE(ptrace(PT_CONTINUE, children[0], (caddr_t)1, 0) != -1);
|
|
|
|
/* Signal the fork parent to continue. */
|
|
close(cpipe[0]);
|
|
|
|
children[1] = handle_fork_events(children[0]);
|
|
ATF_REQUIRE(children[1] > 0);
|
|
|
|
ATF_REQUIRE(ptrace(PT_DETACH, children[0], (caddr_t)1, 0) != -1);
|
|
ATF_REQUIRE(ptrace(PT_CONTINUE, children[1], (caddr_t)1, 0) != -1);
|
|
|
|
/*
|
|
* Should not see any status from the fork parent now, only
|
|
* the child.
|
|
*/
|
|
wpid = wait(&status);
|
|
ATF_REQUIRE(wpid == children[1]);
|
|
ATF_REQUIRE(WIFEXITED(status));
|
|
ATF_REQUIRE(WEXITSTATUS(status) == 2);
|
|
|
|
wpid = wait(&status);
|
|
ATF_REQUIRE(wpid == -1);
|
|
ATF_REQUIRE(errno == ECHILD);
|
|
}
|
|
|
|
/*
|
|
* Verify that a child process does not see an unrelated debugger as its
|
|
* parent but sees its original parent process.
|
|
*/
|
|
ATF_TC_WITHOUT_HEAD(ptrace__getppid);
|
|
ATF_TC_BODY(ptrace__getppid, tc)
|
|
{
|
|
pid_t child, debugger, ppid, wpid;
|
|
int cpipe[2], dpipe[2], status;
|
|
char c;
|
|
|
|
ATF_REQUIRE(pipe(cpipe) == 0);
|
|
ATF_REQUIRE((child = fork()) != -1);
|
|
|
|
if (child == 0) {
|
|
/* Child process. */
|
|
close(cpipe[0]);
|
|
|
|
/* Wait for parent to be ready. */
|
|
CHILD_REQUIRE(read(cpipe[1], &c, sizeof(c)) == sizeof(c));
|
|
|
|
/* Report the parent PID to the parent. */
|
|
ppid = getppid();
|
|
CHILD_REQUIRE(write(cpipe[1], &ppid, sizeof(ppid)) ==
|
|
sizeof(ppid));
|
|
|
|
_exit(1);
|
|
}
|
|
close(cpipe[1]);
|
|
|
|
ATF_REQUIRE(pipe(dpipe) == 0);
|
|
ATF_REQUIRE((debugger = fork()) != -1);
|
|
|
|
if (debugger == 0) {
|
|
/* Debugger process. */
|
|
close(dpipe[0]);
|
|
|
|
CHILD_REQUIRE(ptrace(PT_ATTACH, child, NULL, 0) != -1);
|
|
|
|
wpid = waitpid(child, &status, 0);
|
|
CHILD_REQUIRE(wpid == child);
|
|
CHILD_REQUIRE(WIFSTOPPED(status));
|
|
CHILD_REQUIRE(WSTOPSIG(status) == SIGSTOP);
|
|
|
|
CHILD_REQUIRE(ptrace(PT_CONTINUE, child, (caddr_t)1, 0) != -1);
|
|
|
|
/* Signal parent that debugger is attached. */
|
|
CHILD_REQUIRE(write(dpipe[1], &c, sizeof(c)) == sizeof(c));
|
|
|
|
/* Wait for traced child to exit. */
|
|
wpid = waitpid(child, &status, 0);
|
|
CHILD_REQUIRE(wpid == child);
|
|
CHILD_REQUIRE(WIFEXITED(status));
|
|
CHILD_REQUIRE(WEXITSTATUS(status) == 1);
|
|
|
|
_exit(0);
|
|
}
|
|
close(dpipe[1]);
|
|
|
|
/* Parent process. */
|
|
|
|
/* Wait for the debugger to attach to the child. */
|
|
ATF_REQUIRE(read(dpipe[0], &c, sizeof(c)) == sizeof(c));
|
|
|
|
/* Release the child. */
|
|
ATF_REQUIRE(write(cpipe[0], &c, sizeof(c)) == sizeof(c));
|
|
|
|
/* Read the parent PID from the child. */
|
|
ATF_REQUIRE(read(cpipe[0], &ppid, sizeof(ppid)) == sizeof(ppid));
|
|
close(cpipe[0]);
|
|
|
|
ATF_REQUIRE(ppid == getpid());
|
|
|
|
/* Wait for the debugger. */
|
|
wpid = waitpid(debugger, &status, 0);
|
|
ATF_REQUIRE(wpid == debugger);
|
|
ATF_REQUIRE(WIFEXITED(status));
|
|
ATF_REQUIRE(WEXITSTATUS(status) == 0);
|
|
|
|
/* The child process should now be ready. */
|
|
wpid = waitpid(child, &status, WNOHANG);
|
|
ATF_REQUIRE(wpid == child);
|
|
ATF_REQUIRE(WIFEXITED(status));
|
|
ATF_REQUIRE(WEXITSTATUS(status) == 1);
|
|
}
|
|
|
|
ATF_TP_ADD_TCS(tp)
|
|
{
|
|
|
|
ATF_TP_ADD_TC(tp, ptrace__parent_wait_after_trace_me);
|
|
ATF_TP_ADD_TC(tp, ptrace__parent_wait_after_attach);
|
|
ATF_TP_ADD_TC(tp, ptrace__parent_sees_exit_after_child_debugger);
|
|
ATF_TP_ADD_TC(tp, ptrace__parent_sees_exit_after_unrelated_debugger);
|
|
ATF_TP_ADD_TC(tp, ptrace__follow_fork_both_attached);
|
|
ATF_TP_ADD_TC(tp, ptrace__follow_fork_child_detached);
|
|
ATF_TP_ADD_TC(tp, ptrace__follow_fork_parent_detached);
|
|
ATF_TP_ADD_TC(tp, ptrace__follow_fork_both_attached_unrelated_debugger);
|
|
ATF_TP_ADD_TC(tp,
|
|
ptrace__follow_fork_child_detached_unrelated_debugger);
|
|
ATF_TP_ADD_TC(tp,
|
|
ptrace__follow_fork_parent_detached_unrelated_debugger);
|
|
ATF_TP_ADD_TC(tp, ptrace__getppid);
|
|
|
|
return (atf_no_error());
|
|
}
|