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/* Copyright (C) 2002-2025 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
<https://www.gnu.org/licenses/>. */
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <paths.h>
#include <sys/resource.h>
#include <support/capture_subprocess.h>
#include <support/check.h>
#include <support/temp_file.h>
#include <support/support.h>
#include <support/xthread.h>
#include <support/xunistd.h>
static char *tmpdir;
static long int namemax;
static void
do_prepare (int argc, char *argv[])
{
tmpdir = support_create_temp_directory ("tst-system-");
/* Include the last '/0'. */
namemax = pathconf (tmpdir, _PC_NAME_MAX) + 1;
TEST_VERIFY_EXIT (namemax != -1);
}
#define PREPARE do_prepare
struct args
{
const char *command;
int exit_status;
int term_sig;
const char *path;
};
static void
call_system (void *closure)
{
struct args *args = (struct args *) closure;
int ret;
if (args->path != NULL)
TEST_COMPARE (setenv ("PATH", args->path, 1), 0);
ret = system (args->command);
if (args->term_sig == 0)
{
/* Expect regular termination. */
TEST_VERIFY (WIFEXITED (ret) != 0);
TEST_COMPARE (WEXITSTATUS (ret), args->exit_status);
}
else
{
/* status_or_signal < 0. Expect termination by signal. */
TEST_VERIFY (WIFSIGNALED (ret) != 0);
TEST_COMPARE (WTERMSIG (ret), args->term_sig);
}
}
static void *
sleep_and_check_sigchld (void *closure)
{
double *seconds = (double *) closure;
char cmd[namemax];
sprintf (cmd, "sleep %lf" , *seconds);
TEST_COMPARE (system (cmd), 0);
sigset_t blocked = { };
TEST_COMPARE (sigprocmask (SIG_BLOCK, NULL, &blocked), 0);
TEST_COMPARE (sigismember (&blocked, SIGCHLD), 0);
return NULL;
}
static int
do_test (void)
{
TEST_VERIFY (system (NULL) != 0);
{
char cmd[namemax];
memset (cmd, 'a', sizeof(cmd));
cmd[sizeof(cmd) - 1] = '\0';
struct support_capture_subprocess result;
result = support_capture_subprocess (call_system,
&(struct args) {
cmd, 127, 0, tmpdir
});
support_capture_subprocess_check (&result, "system", 0, sc_allow_stderr);
char *returnerr = xasprintf ("%s: execing %s failed: "
"No such file or directory",
basename(_PATH_BSHELL), cmd);
TEST_COMPARE_STRING (result.err.buffer, returnerr);
free (returnerr);
}
{
char cmd[namemax + 1];
memset (cmd, 'a', sizeof(cmd));
cmd[sizeof(cmd) - 1] = '\0';
struct support_capture_subprocess result;
result = support_capture_subprocess (call_system,
&(struct args) {
cmd, 127, 0, tmpdir
});
support_capture_subprocess_check (&result, "system", 0, sc_allow_stderr);
char *returnerr = xasprintf ("%s: execing %s failed: "
"File name too long",
basename(_PATH_BSHELL), cmd);
TEST_COMPARE_STRING (result.err.buffer, returnerr);
free (returnerr);
}
{
struct support_capture_subprocess result;
result = support_capture_subprocess (call_system,
&(struct args) {
"kill $$", 0, SIGTERM
});
support_capture_subprocess_check (&result, "system", 0, sc_allow_none);
}
{
struct support_capture_subprocess result;
result = support_capture_subprocess (call_system,
&(struct args) { "echo ...", 0 });
support_capture_subprocess_check (&result, "system", 0, sc_allow_stdout);
TEST_COMPARE_STRING (result.out.buffer, "...\n");
}
{
struct support_capture_subprocess result;
const char *cmd = "-echo";
result = support_capture_subprocess (call_system,
&(struct args) { cmd, 127 });
support_capture_subprocess_check (&result, "system", 0, sc_allow_stderr |
sc_allow_stdout);
char *returnerr = xasprintf ("%s: execing -echo failed: "
"No such file or directory",
basename(_PATH_BSHELL));
TEST_COMPARE_STRING (result.err.buffer, returnerr);
free (returnerr);
}
{
struct support_capture_subprocess result;
result = support_capture_subprocess (call_system,
&(struct args) { "exit 1", 1 });
support_capture_subprocess_check (&result, "system", 0, sc_allow_none);
}
{
struct stat64 st;
xstat64 (_PATH_BSHELL, &st);
mode_t mode = st.st_mode;
xchmod (_PATH_BSHELL, mode & ~(S_IXUSR | S_IXGRP | S_IXOTH));
struct support_capture_subprocess result;
result = support_capture_subprocess (call_system,
&(struct args) {
"exit 1", 127, 0
});
support_capture_subprocess_check (&result, "system", 0, sc_allow_none);
xchmod (_PATH_BSHELL, st.st_mode);
}
{
pthread_t long_sleep_thread = xpthread_create (NULL,
sleep_and_check_sigchld,
&(double) { 0.2 });
pthread_t short_sleep_thread = xpthread_create (NULL,
sleep_and_check_sigchld,
&(double) { 0.1 });
xpthread_join (short_sleep_thread);
xpthread_join (long_sleep_thread);
}
{
struct rlimit rlimit_orig, rlimit_new;
if (getrlimit (RLIMIT_NPROC, &rlimit_orig) != 0)
FAIL_EXIT1 ("getrlimit (RLIMIT_NPROC) failed: %m");
/* Force failure for the system call */
rlimit_new.rlim_cur = 0;
rlimit_new.rlim_max = rlimit_orig.rlim_max;
if (setrlimit (RLIMIT_NPROC, &rlimit_new) != 0)
FAIL_EXIT1 ("setrlimit (RLIMIT_NPROC) failed: %m");
TEST_COMPARE (system (""), -1);
/* Restore NPROC limit */
if (setrlimit (RLIMIT_NPROC, &rlimit_orig) != 0)
FAIL_EXIT1 ("setrlimit (RLIMIT_NPROC) failed: %m");
}
TEST_COMPARE (system (""), 0);
return 0;
}
#include <support/test-driver.c>
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