mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-24 11:41:07 +00:00
b3b6a40ab9
The main changes are: - Adapt to libsupport. - Synchronize the signal handler using atomics. - Replace waitpid by waitid calls. - Use support_process_state_wait to wait for child state. - Add tests for P_PGID and P_ALL. - Use sigwaitinfo instead of global state set by the signal handler. Checked on x86_64-linux-gnu and i686-linux-gnu.
276 lines
7.9 KiB
C
276 lines
7.9 KiB
C
/* Tests for waitid.
|
|
Copyright (C) 2004-2020 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <sys/wait.h>
|
|
#include <signal.h>
|
|
#include <time.h>
|
|
#include <stdatomic.h>
|
|
#include <stdbool.h>
|
|
|
|
#include <support/xsignal.h>
|
|
#include <support/xunistd.h>
|
|
#include <support/check.h>
|
|
#include <support/process_state.h>
|
|
|
|
static void
|
|
test_child (bool setgroup)
|
|
{
|
|
if (setgroup)
|
|
TEST_COMPARE (setpgid (0, 0), 0);
|
|
|
|
/* First thing, we stop ourselves. */
|
|
raise (SIGSTOP);
|
|
|
|
/* Hey, we got continued! */
|
|
while (1)
|
|
pause ();
|
|
}
|
|
|
|
#ifndef WEXITED
|
|
# define WEXITED 0
|
|
# define WCONTINUED 0
|
|
# define WSTOPPED WUNTRACED
|
|
#endif
|
|
|
|
/* Set with only SIGCHLD on do_test_waitid. */
|
|
static sigset_t chldset;
|
|
|
|
#ifdef SA_SIGINFO
|
|
static void
|
|
sigchld (int signo, siginfo_t *info, void *ctx)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
check_sigchld (int code, int status, pid_t pid)
|
|
{
|
|
#ifdef SA_SIGINFO
|
|
siginfo_t siginfo;
|
|
TEST_COMPARE (sigwaitinfo (&chldset, &siginfo), SIGCHLD);
|
|
|
|
TEST_COMPARE (siginfo.si_signo, SIGCHLD);
|
|
TEST_COMPARE (siginfo.si_code, code);
|
|
TEST_COMPARE (siginfo.si_status, status);
|
|
TEST_COMPARE (siginfo.si_pid, pid);
|
|
#endif
|
|
}
|
|
|
|
static int
|
|
do_test_waitd_common (idtype_t type, pid_t pid)
|
|
{
|
|
/* Adding process_state_tracing_stop ('t') allows the test to work under
|
|
trace programs such as ptrace. */
|
|
enum support_process_state stop_state = support_process_state_stopped
|
|
| support_process_state_tracing_stop;
|
|
|
|
support_process_state_wait (pid, stop_state);
|
|
|
|
check_sigchld (CLD_STOPPED, SIGSTOP, pid);
|
|
|
|
/* Now try a wait that should not succeed. */
|
|
siginfo_t info;
|
|
int fail;
|
|
|
|
info.si_signo = 0; /* A successful call sets it to SIGCHLD. */
|
|
fail = waitid (P_PID, pid, &info, WEXITED|WCONTINUED|WNOHANG);
|
|
if (fail == -1 && errno == ENOTSUP)
|
|
FAIL_RET ("waitid WNOHANG on stopped: %m");
|
|
TEST_COMPARE (fail, 0);
|
|
TEST_COMPARE (info.si_signo, 0);
|
|
|
|
/* Next the wait that should succeed right away. */
|
|
info.si_signo = 0; /* A successful call sets it to SIGCHLD. */
|
|
info.si_pid = -1;
|
|
info.si_status = -1;
|
|
fail = waitid (P_PID, pid, &info, WSTOPPED|WNOHANG);
|
|
if (fail == -1 && errno == ENOTSUP)
|
|
FAIL_RET ("waitid WNOHANG on stopped: %m");
|
|
TEST_COMPARE (fail, 0);
|
|
TEST_COMPARE (info.si_signo, SIGCHLD);
|
|
TEST_COMPARE (info.si_code, CLD_STOPPED);
|
|
TEST_COMPARE (info.si_status, SIGSTOP);
|
|
TEST_COMPARE (info.si_pid, pid);
|
|
|
|
if (kill (pid, SIGCONT) != 0)
|
|
FAIL_RET ("kill (%d, SIGCONT): %m\n", pid);
|
|
|
|
/* Wait for the child to have continued. */
|
|
support_process_state_wait (pid, support_process_state_sleeping);
|
|
|
|
#if WCONTINUED != 0
|
|
check_sigchld (CLD_CONTINUED, SIGCONT, pid);
|
|
|
|
info.si_signo = 0; /* A successful call sets it to SIGCHLD. */
|
|
info.si_pid = -1;
|
|
info.si_status = -1;
|
|
fail = waitid (P_PID, pid, &info, WCONTINUED|WNOWAIT);
|
|
if (fail == -1 && errno == ENOTSUP)
|
|
FAIL_RET ("waitid WCONTINUED|WNOWAIT on continued: %m");
|
|
TEST_COMPARE (fail, 0);
|
|
TEST_COMPARE (info.si_signo, SIGCHLD);
|
|
TEST_COMPARE (info.si_code, CLD_CONTINUED);
|
|
TEST_COMPARE (info.si_status, SIGCONT);
|
|
TEST_COMPARE (info.si_pid, pid);
|
|
|
|
/* That should leave the CLD_CONTINUED state waiting to be seen again. */
|
|
info.si_signo = 0; /* A successful call sets it to SIGCHLD. */
|
|
info.si_pid = -1;
|
|
info.si_status = -1;
|
|
fail = waitid (P_PID, pid, &info, WCONTINUED);
|
|
if (fail == -1 && errno == ENOTSUP)
|
|
FAIL_RET ("waitid WCONTINUED on continued: %m");
|
|
TEST_COMPARE (fail, 0);
|
|
TEST_COMPARE (info.si_signo, SIGCHLD);
|
|
TEST_COMPARE (info.si_code, CLD_CONTINUED);
|
|
TEST_COMPARE (info.si_status, SIGCONT);
|
|
TEST_COMPARE (info.si_pid, pid);
|
|
|
|
/* Now try a wait that should not succeed. */
|
|
info.si_signo = 0; /* A successful call sets it to SIGCHLD. */
|
|
fail = waitid (P_PID, pid, &info, WCONTINUED|WNOHANG);
|
|
if (fail == -1 && errno == ENOTSUP)
|
|
FAIL_RET ("waitid WCONTINUED|WNOHANG on waited continued: %m");
|
|
TEST_COMPARE (fail, 0);
|
|
TEST_COMPARE (info.si_signo, 0);
|
|
|
|
/* Now stop him again and test waitpid with WCONTINUED. */
|
|
if (kill (pid, SIGSTOP) != 0)
|
|
FAIL_RET ("kill (%d, SIGSTOP): %m\n", pid);
|
|
|
|
/* Wait the child stop. The waitid call below will block until it has
|
|
stopped, but if we are real quick and enter the waitid system call
|
|
before the SIGCHLD has been generated, then it will be discarded and
|
|
never delivered. */
|
|
support_process_state_wait (pid, stop_state);
|
|
|
|
fail = waitid (type, pid, &info, WEXITED|WSTOPPED);
|
|
TEST_COMPARE (fail, 0);
|
|
TEST_COMPARE (info.si_signo, SIGCHLD);
|
|
TEST_COMPARE (info.si_code, CLD_STOPPED);
|
|
TEST_COMPARE (info.si_status, SIGSTOP);
|
|
TEST_COMPARE (info.si_pid, pid);
|
|
|
|
check_sigchld (CLD_STOPPED, SIGSTOP, pid);
|
|
|
|
if (kill (pid, SIGCONT) != 0)
|
|
FAIL_RET ("kill (%d, SIGCONT): %m\n", pid);
|
|
|
|
/* Wait for the child to have continued. */
|
|
support_process_state_wait (pid, support_process_state_sleeping);
|
|
|
|
check_sigchld (CLD_CONTINUED, SIGCONT, pid);
|
|
|
|
fail = waitid (type, pid, &info, WCONTINUED);
|
|
TEST_COMPARE (fail, 0);
|
|
TEST_COMPARE (info.si_signo, SIGCHLD);
|
|
TEST_COMPARE (info.si_code, CLD_CONTINUED);
|
|
TEST_COMPARE (info.si_status, SIGCONT);
|
|
TEST_COMPARE (info.si_pid, pid);
|
|
#endif
|
|
|
|
/* Die, child, die! */
|
|
if (kill (pid, SIGKILL) != 0)
|
|
FAIL_RET ("kill (%d, SIGKILL): %m\n", pid);
|
|
|
|
#ifdef WNOWAIT
|
|
info.si_signo = 0; /* A successful call sets it to SIGCHLD. */
|
|
info.si_pid = -1;
|
|
info.si_status = -1;
|
|
fail = waitid (type, pid, &info, WEXITED|WNOWAIT);
|
|
if (fail == -1 && errno == ENOTSUP)
|
|
FAIL_RET ("waitid WNOHANG on killed: %m");
|
|
TEST_COMPARE (fail, 0);
|
|
TEST_COMPARE (info.si_signo, SIGCHLD);
|
|
TEST_COMPARE (info.si_code, CLD_KILLED);
|
|
TEST_COMPARE (info.si_status, SIGKILL);
|
|
TEST_COMPARE (info.si_pid, pid);
|
|
#else
|
|
support_process_state_wait (pid, support_process_state_zombie);
|
|
#endif
|
|
check_sigchld (CLD_KILLED, SIGKILL, pid);
|
|
|
|
info.si_signo = 0; /* A successful call sets it to SIGCHLD. */
|
|
info.si_pid = -1;
|
|
info.si_status = -1;
|
|
fail = waitid (type, pid, &info, WEXITED | WNOHANG);
|
|
TEST_COMPARE (fail, 0);
|
|
TEST_COMPARE (info.si_signo, SIGCHLD);
|
|
TEST_COMPARE (info.si_code, CLD_KILLED);
|
|
TEST_COMPARE (info.si_status, SIGKILL);
|
|
TEST_COMPARE (info.si_pid, pid);
|
|
|
|
fail = waitid (P_PID, pid, &info, WEXITED);
|
|
TEST_COMPARE (fail, -1);
|
|
TEST_COMPARE (errno, ECHILD);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
do_test_waitid (idtype_t type)
|
|
{
|
|
#ifdef SA_SIGINFO
|
|
{
|
|
struct sigaction sa;
|
|
sa.sa_flags = SA_SIGINFO | SA_RESTART;
|
|
sa.sa_sigaction = sigchld;
|
|
sigemptyset (&sa.sa_mask);
|
|
xsigaction (SIGCHLD, &sa, NULL);
|
|
}
|
|
#endif
|
|
|
|
sigemptyset (&chldset);
|
|
sigaddset (&chldset, SIGCHLD);
|
|
|
|
/* The SIGCHLD shall has blocked at the time of the call to sigwait;
|
|
otherwise, the behavior is undefined. */
|
|
sigprocmask (SIG_BLOCK, &chldset, NULL);
|
|
|
|
pid_t pid = xfork ();
|
|
if (pid == 0)
|
|
{
|
|
test_child (type == P_PGID || type == P_ALL);
|
|
_exit (127);
|
|
}
|
|
|
|
int ret = do_test_waitd_common (type, pid);
|
|
|
|
xsignal (SIGCHLD, SIG_IGN);
|
|
kill (pid, SIGKILL); /* Make sure it's dead if we bailed early. */
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
do_test (void)
|
|
{
|
|
int ret = 0;
|
|
|
|
ret |= do_test_waitid (P_PID);
|
|
ret |= do_test_waitid (P_PGID);
|
|
ret |= do_test_waitid (P_ALL);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#include <support/test-driver.c>
|