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/* Test the posix_spawn_file_actions_addchdir_np function.
Copyright (C) 2018-2025 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 <array_length.h>
#include <errno.h>
#include <fcntl.h>
#include <spawn.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <support/check.h>
#include <support/support.h>
#include <support/temp_file.h>
#include <support/test-driver.h>
#include <support/xstdio.h>
#include <support/xunistd.h>
#include <sys/wait.h>
#include <unistd.h>
#include <tst-spawn.h>
/* Reads the file at PATH, which must consist of exactly one line.
Removes the line terminator at the end of the file. */
static char *
read_one_line (const char *path)
{
FILE *fp = xfopen (path, "r");
char *buffer = NULL;
size_t length = 0;
ssize_t ret = getline (&buffer, &length, fp);
if (ferror (fp))
FAIL_EXIT1 ("getline: %m");
if (ret < 1)
FAIL_EXIT1 ("getline returned %zd", ret);
if (fgetc (fp) != EOF)
FAIL_EXIT1 ("trailing bytes in %s", path);
if (ferror (fp))
FAIL_EXIT1 ("fgetc: %m");
xfclose (fp);
if (buffer[ret - 1] != '\n')
FAIL_EXIT1 ("missing line terminator in %s", path);
buffer[ret - 1] = 0;
return buffer;
}
/* Return the path to the "pwd" program. */
const char *
get_pwd_program (void)
{
const char *const paths[] = { "/bin/pwd", "/usr/bin/pwd" };
for (size_t i = 0; i < array_length (paths); ++i)
if (access (paths[i], X_OK) == 0)
return paths[i];
FAIL_EXIT1 ("cannot find pwd program");
}
/* Adds chdir operations to ACTIONS, using PATH. If DO_FCHDIR, use
the open function and TMPFD to emulate chdir using fchdir. */
static void
add_chdir (posix_spawn_file_actions_t *actions, const char *path,
bool do_fchdir, int tmpfd)
{
if (do_fchdir)
{
TEST_COMPARE (posix_spawn_file_actions_addopen
(actions, tmpfd, path, O_DIRECTORY | O_RDONLY, 0), 0);
TEST_COMPARE (posix_spawn_file_actions_addfchdir_np
(actions, tmpfd), 0);
TEST_COMPARE (posix_spawn_file_actions_addclose (actions, tmpfd), 0);
}
else
TEST_COMPARE (posix_spawn_file_actions_addchdir_np (actions, path), 0);
}
static int
do_test (void)
{
/* Directory for temporary file data. Each subtest uses a numeric
subdirectory. */
char *directory = support_create_temp_directory ("tst-spawn-chdir-");
{
/* Avoid symbolic links, to get more consistent behavior from the
pwd command. */
char *tmp = realpath (directory, NULL);
if (tmp == NULL)
FAIL_EXIT1 ("realpath: %m");
free (directory);
directory = tmp;
}
char *original_cwd = get_current_dir_name ();
if (original_cwd == NULL)
FAIL_EXIT1 ("get_current_dir_name: %m");
int iteration = 0;
for (int do_spawnp = 0; do_spawnp < 2; ++do_spawnp)
for (int do_overwrite = 0; do_overwrite < 2; ++do_overwrite)
for (int do_fchdir = 0; do_fchdir < 2; ++do_fchdir)
{
/* This subtest does not make sense for fchdir. */
if (do_overwrite && do_fchdir)
continue;
++iteration;
if (test_verbose > 0)
printf ("info: iteration=%d do_spawnp=%d do_overwrite=%d"
" do_fchdir=%d\n",
iteration, do_spawnp, do_overwrite, do_fchdir);
/* The "pwd" program runs in this directory. */
char *iteration_directory = xasprintf ("%s/%d", directory, iteration);
add_temp_file (iteration_directory);
xmkdir (iteration_directory, 0777);
/* This file receives output from "pwd". */
char *output_file_path
= xasprintf ("%s/output-file", iteration_directory);
add_temp_file (output_file_path);
/* This subdirectory is used for chdir ordering checks. */
char *subdir_path = xasprintf ("%s/subdir", iteration_directory);
add_temp_file (subdir_path);
xmkdir (subdir_path, 0777);
/* Also used for checking the order of actions. */
char *probe_file_path
= xasprintf ("%s/subdir/probe-file", iteration_directory);
add_temp_file (probe_file_path);
TEST_COMPARE (access (probe_file_path, F_OK), -1);
TEST_COMPARE (errno, ENOENT);
/* This symbolic link is used in a relative path with
posix_spawn. */
char *pwd_symlink_path
= xasprintf ("%s/subdir/pwd-symlink", iteration_directory);
xsymlink (get_pwd_program (), pwd_symlink_path);
add_temp_file (pwd_symlink_path);
posix_spawn_file_actions_t actions;
TEST_COMPARE (posix_spawn_file_actions_init (&actions), 0);
add_chdir (&actions, subdir_path, do_fchdir, 4);
TEST_COMPARE (posix_spawn_file_actions_addopen
(&actions, 3, /* Arbitrary unused descriptor. */
"probe-file",
O_WRONLY | O_CREAT | O_EXCL, 0777), 0);
TEST_COMPARE (posix_spawn_file_actions_addclose (&actions, 3), 0);
/* Run the actual in iteration_directory. */
add_chdir (&actions, "..", do_fchdir, 5);
TEST_COMPARE (posix_spawn_file_actions_addopen
(&actions, STDOUT_FILENO, "output-file",
O_WRONLY | O_CREAT | O_EXCL, 0777), 0);
/* Check that posix_spawn_file_actions_addchdir_np made a copy
of the path. */
if (do_overwrite)
subdir_path[0] = '\0';
char *const argv[] = { (char *) "pwd", NULL };
char *const envp[] = { NULL } ;
PID_T_TYPE pid;
if (do_spawnp)
TEST_COMPARE (POSIX_SPAWNP (&pid, "pwd", &actions,
NULL, argv, envp), 0);
else
TEST_COMPARE (POSIX_SPAWN (&pid, "subdir/pwd-symlink", &actions,
NULL, argv, envp), 0);
TEST_VERIFY (pid > 0);
siginfo_t sinfo;
TEST_COMPARE (WAITID (P_ALL, 0, &sinfo, WEXITED), 0);
TEST_COMPARE (sinfo.si_code, CLD_EXITED);
TEST_COMPARE (sinfo.si_status, 0);
/* Check that the current directory did not change. */
{
char *cwd = get_current_dir_name ();
if (cwd == NULL)
FAIL_EXIT1 ("get_current_dir_name: %m");
TEST_COMPARE_BLOB (original_cwd, strlen (original_cwd),
cwd, strlen (cwd));
free (cwd);
}
/* Check the output from "pwd". */
{
char *pwd = read_one_line (output_file_path);
TEST_COMPARE_BLOB (iteration_directory, strlen (iteration_directory),
pwd, strlen (pwd));
free (pwd);
}
/* This file must now exist. */
TEST_COMPARE (access (probe_file_path, F_OK), 0);
TEST_COMPARE (posix_spawn_file_actions_destroy (&actions), 0);
free (pwd_symlink_path);
free (probe_file_path);
free (subdir_path);
free (output_file_path);
}
free (directory);
return 0;
}
#include <support/test-driver.c>
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