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/* Tests for posix_spawn signal handling.
Copyright (C) 2023-2025 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
<http://www.gnu.org/licenses/>. */
#include <assert.h>
#include <getopt.h>
#include <spawn.h>
#include <stdlib.h>
#include <string.h>
#include <support/check.h>
#include <support/xsignal.h>
#include <support/xunistd.h>
#include <sys/wait.h>
#include <unistd.h>
#include <tst-spawn.h>
/* Nonzero if the program gets called via `exec'. */
#define CMDLINE_OPTIONS \
{ "restart", no_argument, &restart, 1 },
static int restart;
/* Hold the four initial argument used to respawn the process, plus the extra
'--direct', '--restart', the check type ('SIG_IGN' or 'SIG_DFL'), and a
final NULL. */
static char *spargs[8];
static int check_type_argc;
/* Called on process re-execution. */
_Noreturn static void
handle_restart (int argc, char *argv[])
{
assert (argc == 1);
if (strcmp (argv[0], "SIG_DFL") == 0)
{
for (int i = 1; i < NSIG; i++)
{
struct sigaction sa;
int r = sigaction (i, NULL, &sa);
/* Skip internal signals (such as SIGCANCEL). */
if (r == -1)
continue;
TEST_VERIFY_EXIT (sa.sa_handler == SIG_DFL);
}
exit (EXIT_SUCCESS);
}
else if (strcmp (argv[0], "SIG_IGN") == 0)
{
for (int i = 1; i < NSIG; i++)
{
struct sigaction sa;
int r = sigaction (i, NULL, &sa);
/* Skip internal signals (such as SIGCANCEL). */
if (r == -1)
continue;
if (i == SIGUSR1 || i == SIGUSR2)
TEST_VERIFY_EXIT (sa.sa_handler == SIG_IGN);
else
TEST_VERIFY_EXIT (sa.sa_handler == SIG_DFL);
}
exit (EXIT_SUCCESS);
}
exit (EXIT_FAILURE);
}
static void
spawn_signal_test (const char *type, const posix_spawnattr_t *attr)
{
spargs[check_type_argc] = (char*) type;
PID_T_TYPE pid;
siginfo_t sinfo;
TEST_COMPARE (POSIX_SPAWN (&pid, spargs[0], NULL, attr, spargs, environ), 0);
TEST_COMPARE (WAITID (P_ALL, 0, &sinfo, WEXITED), 0);
TEST_COMPARE (sinfo.si_code, CLD_EXITED);
TEST_COMPARE (sinfo.si_status, 0);
}
static void
dummy_sa_handler (int signal)
{
}
static void
do_test_signals (void)
{
/* Ensure the initial signal disposition, ignore EINVAL for internal
signal such as SIGCANCEL. */
for (int sig = 1; sig < _NSIG; ++sig)
sigaction (sig, &(struct sigaction) { .sa_handler = SIG_DFL,
.sa_flags = 0 }, NULL);
{
/* Check if all signals handler are set to SIG_DFL on spawned process. */
spawn_signal_test ("SIG_DFL", NULL);
}
{
/* Same as before, but set SIGUSR1 and SIGUSR2 to a handler different than
SIG_IGN or SIG_DFL. */
struct sigaction sa = { };
sa.sa_handler = dummy_sa_handler;
xsigaction (SIGUSR1, &sa, NULL);
xsigaction (SIGUSR2, &sa, NULL);
spawn_signal_test ("SIG_DFL", NULL);
}
{
/* Check if SIG_IGN is keep as is. */
struct sigaction sa = { };
sa.sa_handler = SIG_IGN;
xsigaction (SIGUSR1, &sa, NULL);
xsigaction (SIGUSR2, &sa, NULL);
spawn_signal_test ("SIG_IGN", NULL);
}
{
/* Check if SIG_IGN handlers are set to SIG_DFL. */
posix_spawnattr_t attr;
posix_spawnattr_init (&attr);
sigset_t mask;
sigemptyset (&mask);
sigaddset (&mask, SIGUSR1);
sigaddset (&mask, SIGUSR2);
posix_spawnattr_setsigdefault (&attr, &mask);
posix_spawnattr_setflags (&attr, POSIX_SPAWN_SETSIGDEF);
spawn_signal_test ("SIG_DFL", &attr);
posix_spawnattr_destroy (&attr);
}
}
static int
do_test (int argc, char *argv[])
{
/* We must have either:
- one or four parameters if called initially:
+ argv[1]: path for ld.so optional
+ argv[2]: "--library-path" optional
+ argv[3]: the library path optional
+ argv[4]: the application name
- six parameters left if called through re-execution:
+ argv[1]: the application name
+ argv[2]: check SIG_IGN/SIG_DFL.
* When built with --enable-hardcoded-path-in-tests or issued without
using the loader directly. */
if (restart)
handle_restart (argc - 1, &argv[1]);
TEST_VERIFY_EXIT (argc == 2 || argc == 5);
int i;
for (i = 0; i < argc - 1; i++)
spargs[i] = argv[i + 1];
spargs[i++] = (char *) "--direct";
spargs[i++] = (char *) "--restart";
check_type_argc = i++;
spargs[i] = NULL;
do_test_signals ();
return 0;
}
#define TEST_FUNCTION_ARGV do_test
#include <support/test-driver.c>
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