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glibc/posix/tst-spawn5.c

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/* Tests for posix_spawn signal handling.
Copyright (C) 2021-2022 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 <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <spawn.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <dirent.h>
#include <stdbool.h>
#include <errno.h>
#include <limits.h>
#include <support/check.h>
#include <support/xunistd.h>
#include <support/support.h>
#include <arch-fd_to_filename.h>
#include <array_length.h>
/* Nonzero if the program gets called via `exec'. */
static int restart;
/* Hold the four initial argument used to respawn the process, plus
the extra '--direct' and '--restart', and a final NULL. */
static char *initial_argv[7];
static int initial_argv_count;
#define CMDLINE_OPTIONS \
{ "restart", no_argument, &restart, 1 },
#define NFDS 100
static int
parse_fd (const char *str)
{
char *endptr;
long unsigned int fd = strtoul (str, &endptr, 10);
if (*endptr != '\0' || fd > INT_MAX)
FAIL_EXIT1 ("invalid file descriptor value: %s", str);
return fd;
}
/* Called on process re-execution. The arguments are the expected opened
file descriptors. */
_Noreturn static void
handle_restart (int argc, char *argv[])
{
TEST_VERIFY (argc > 0);
int lowfd = parse_fd (argv[0]);
size_t nfds = argc > 1 ? argc - 1 : 0;
struct fd_t
{
int fd;
_Bool found;
} *fds = xmalloc (sizeof (struct fd_t) * nfds);
for (int i = 0; i < nfds; i++)
{
fds[i].fd = parse_fd (argv[i + 1]);
fds[i].found = false;
}
DIR *dirp = opendir (FD_TO_FILENAME_PREFIX);
if (dirp == NULL)
FAIL_EXIT1 ("opendir (\"" FD_TO_FILENAME_PREFIX "\"): %m");
while (true)
{
errno = 0;
struct dirent64 *e = readdir64 (dirp);
if (e == NULL)
{
if (errno != 0)
FAIL_EXIT1 ("readdir: %m");
break;
}
if (e->d_name[0] == '.')
continue;
char *endptr;
long int fd = strtol (e->d_name, &endptr, 10);
if (*endptr != '\0' || fd < 0 || fd > INT_MAX)
FAIL_EXIT1 ("readdir: invalid file descriptor name: /proc/self/fd/%s",
e->d_name);
/* Ignore the descriptors not in the range of the opened files. */
if (fd < lowfd || fd == dirfd (dirp))
continue;
bool found = false;
for (int i = 0; i < nfds; i++)
if (fds[i].fd == fd)
fds[i].found = found = true;
if (!found)
{
char *path = xasprintf ("/proc/self/fd/%s", e->d_name);
char *resolved = xreadlink (path);
FAIL_EXIT1 ("unexpected open file descriptor %ld: %s", fd, resolved);
}
}
closedir (dirp);
for (int i = 0; i < nfds; i++)
if (!fds[i].found)
FAIL_EXIT1 ("file descriptor %d not opened", fds[i].fd);
free (fds);
exit (EXIT_SUCCESS);
}
static void
spawn_closefrom_test (posix_spawn_file_actions_t *fa, int lowfd, int highfd,
int *extrafds, size_t nextrafds)
{
/* 3 or 7 elements from initial_argv:
+ path to ld.so optional
+ --library-path optional
+ the library path optional
+ application name
+ --direct
+ --restart
+ lowest opened file descriptor
+ up to 2 * maximum_fd arguments (the expected open file descriptors),
plus NULL. */
int argv_size = initial_argv_count + 2 * NFDS + 1;
char *args[argv_size];
int argc = 0;
for (char **arg = initial_argv; *arg != NULL; arg++)
args[argc++] = *arg;
args[argc++] = xasprintf ("%d", lowfd);
for (int i = lowfd; i < highfd; i++)
args[argc++] = xasprintf ("%d", i);
for (int i = 0; i < nextrafds; i++)
args[argc++] = xasprintf ("%d", extrafds[i]);
args[argc] = NULL;
TEST_VERIFY (argc < argv_size);
pid_t pid;
int status;
TEST_COMPARE (posix_spawn (&pid, args[0], fa, NULL, args, environ), 0);
TEST_COMPARE (xwaitpid (pid, &status, 0), pid);
TEST_VERIFY (WIFEXITED (status));
TEST_VERIFY (!WIFSIGNALED (status));
TEST_COMPARE (WEXITSTATUS (status), 0);
}
static void
do_test_closefrom (void)
{
int lowfd = support_open_dev_null_range (NFDS, O_RDONLY, 0600);
const int half_fd = lowfd + NFDS / 2;
/* Close half of the descriptors and check result. */
{
posix_spawn_file_actions_t fa;
TEST_COMPARE (posix_spawn_file_actions_init (&fa), 0);
int ret = posix_spawn_file_actions_addclosefrom_np (&fa, half_fd);
if (ret == EINVAL)
/* Hurd currently does not support closefrom fileaction. */
FAIL_UNSUPPORTED ("posix_spawn_file_actions_addclosefrom_np unsupported");
TEST_COMPARE (ret, 0);
spawn_closefrom_test (&fa, lowfd, half_fd, NULL, 0);
TEST_COMPARE (posix_spawn_file_actions_destroy (&fa), 0);
}
/* Create some gaps, close up to a threshold, and check result. */
xclose (lowfd + 57);
xclose (lowfd + 78);
xclose (lowfd + 81);
xclose (lowfd + 82);
xclose (lowfd + 84);
xclose (lowfd + 90);
{
posix_spawn_file_actions_t fa;
TEST_COMPARE (posix_spawn_file_actions_init (&fa), 0);
TEST_COMPARE (posix_spawn_file_actions_addclosefrom_np (&fa, half_fd), 0);
spawn_closefrom_test (&fa, lowfd, half_fd, NULL, 0);
TEST_COMPARE (posix_spawn_file_actions_destroy (&fa), 0);
}
/* Close the remaining but the last one. */
{
posix_spawn_file_actions_t fa;
TEST_COMPARE (posix_spawn_file_actions_init (&fa), 0);
TEST_COMPARE (posix_spawn_file_actions_addclosefrom_np (&fa, lowfd + 1), 0);
spawn_closefrom_test (&fa, lowfd, lowfd + 1, NULL, 0);
TEST_COMPARE (posix_spawn_file_actions_destroy (&fa), 0);
}
/* Close everything. */
{
posix_spawn_file_actions_t fa;
TEST_COMPARE (posix_spawn_file_actions_init (&fa), 0);
TEST_COMPARE (posix_spawn_file_actions_addclosefrom_np (&fa, lowfd), 0);
spawn_closefrom_test (&fa, lowfd, lowfd, NULL, 0);
TEST_COMPARE (posix_spawn_file_actions_destroy (&fa), 0);
}
/* Close a range and add some file actions. */
{
posix_spawn_file_actions_t fa;
TEST_COMPARE (posix_spawn_file_actions_init (&fa), 0);
TEST_COMPARE (posix_spawn_file_actions_addclosefrom_np (&fa, lowfd + 1), 0);
TEST_COMPARE (posix_spawn_file_actions_addopen (&fa, lowfd, "/dev/null",
0666, O_RDONLY), 0);
TEST_COMPARE (posix_spawn_file_actions_adddup2 (&fa, lowfd, lowfd + 1), 0);
TEST_COMPARE (posix_spawn_file_actions_addopen (&fa, lowfd, "/dev/null",
0666, O_RDONLY), 0);
spawn_closefrom_test (&fa, lowfd, lowfd, (int[]){lowfd, lowfd + 1}, 2);
TEST_COMPARE (posix_spawn_file_actions_destroy (&fa), 0);
}
}
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]: the lowest file descriptor expected
+ argv[3]: first expected open file descriptor optional
+ argv[n]: last expected open file descritptor optional
* When built with --enable-hardcoded-path-in-tests or issued without
using the loader directly. */
if (restart)
/* Ignore the application name. */
handle_restart (argc - 1, &argv[1]);
TEST_VERIFY_EXIT (argc == 2 || argc == 5);
int i;
for (i = 0; i < argc - 1; i++)
initial_argv[i] = argv[i + 1];
initial_argv[i++] = (char *) "--direct";
initial_argv[i++] = (char *) "--restart";
initial_argv_count = i;
do_test_closefrom ();
return 0;
}
#define TEST_FUNCTION_ARGV do_test
#include <support/test-driver.c>
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