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/* Tests for support_spawn_wrap.
Copyright (C) 2026 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 <getopt.h>
#include <spawn.h>
#include <stdlib.h>
#include <string.h>
#include <support/capture_subprocess.h>
#include <support/check.h>
#include <support/subprocess.h>
#include <support/support.h>
#include <support/xspawn.h>
#include <support/xunistd.h>
#include <sys/wait.h>
#include <unistd.h>
/* Return true if running via an explicit ld.so invocation. */
static bool
running_via_ldso (void)
{
char *self = realpath ("/proc/self/exe", NULL);
if (self == NULL)
FAIL_UNSUPPORTED ("/proc/self/exe not available");
char *ldso = realpath (support_objdir_elf_ldso, NULL);
TEST_VERIFY_EXIT (ldso != NULL);
bool result = strcmp (self, ldso) == 0;
free (ldso);
free (self);
return result;
}
static void
test_subprocess (int argc, char **argv)
{
{
char *argc_env = getenv ("argc");
if (argc_env != NULL)
{
char *argc_arg = xasprintf ("%d", argc);
TEST_COMPARE_STRING (argc_arg, argc_env);
free (argc_arg);
}
}
if (argc >= 2 && strcmp (argv[1], "alpha") == 0)
{
TEST_COMPARE (argc, 4);
TEST_COMPARE_STRING (argv[0], "program");
TEST_COMPARE_STRING (argv[2], "beta");
TEST_COMPARE_STRING (argv[3], "gamma");
TEST_COMPARE_STRING (argv[4], NULL);
}
else if (argc >= 2 && strcmp (argv[1], "check-env") == 0)
printf ("%d %s\n", argc, getenv ("extra"));
else if (argc >= 2 && strcmp (argv[1], "check-ld.so") == 0)
TEST_VERIFY (running_via_ldso ());
}
/* The "recurse" environment variable and the --recurse option
indicate recursive invocation. */
static int flag_recurse;
#define CMDLINE_OPTIONS \
{ "recurse", no_argument, &flag_recurse, 1 }, \
/* CMDLINE_OPTION */
static void
prepare (int argc, char **argv)
{
if (getenv ("recurse") != NULL || flag_recurse)
{
test_subprocess (argc, argv);
support_record_failure_barrier ();
exit (0);
}
}
#define PREPARE prepare
/* Test wrapping of a non-test program (iconv). This uses posix_spawn
directly, mainly for illustrative purposes. */
void
test_iconv (void)
{
char *iconv_prog = xasprintf ("%s/iconv/iconv_prog", support_objdir_root);
char *argv[] = { (char *) "iconv", (char *) "-f", (char *) "UTF-8",
(char *) "-t", (char *) "ISO-8859-1", NULL };
struct support_spawn_wrapped *w
= support_spawn_wrap (iconv_prog, argv, NULL, support_spawn_wrap_force);
/* Set up pipes for stdin, stdout, and stderr. */
int stdin_pipe[2];
xpipe (stdin_pipe);
int stdout_pipe[2];
xpipe (stdout_pipe);
int stderr_pipe[2];
xpipe (stderr_pipe);
posix_spawn_file_actions_t fa;
posix_spawn_file_actions_init (&fa);
xposix_spawn_file_actions_adddup2 (&fa, stdin_pipe[0], STDIN_FILENO);
xposix_spawn_file_actions_addclose (&fa, stdin_pipe[0]);
xposix_spawn_file_actions_addclose (&fa, stdin_pipe[1]);
xposix_spawn_file_actions_adddup2 (&fa, stdout_pipe[1], STDOUT_FILENO);
xposix_spawn_file_actions_addclose (&fa, stdout_pipe[0]);
xposix_spawn_file_actions_addclose (&fa, stdout_pipe[1]);
xposix_spawn_file_actions_adddup2 (&fa, stderr_pipe[1], STDERR_FILENO);
xposix_spawn_file_actions_addclose (&fa, stderr_pipe[0]);
xposix_spawn_file_actions_addclose (&fa, stderr_pipe[1]);
pid_t pid = xposix_spawn (w->path, &fa, NULL, w->argv, w->envp);
posix_spawn_file_actions_destroy (&fa);
xclose (stdin_pipe[0]);
xclose (stdout_pipe[1]);
xclose (stderr_pipe[1]);
/* Write UTF-8 encoding of "äöü\n" to stdin. */
xwrite (stdin_pipe[1], "\xc3\xa4\xc3\xb6\xc3\xbc\n", 7);
xclose (stdin_pipe[1]);
/* Read the converted output from the pipe. */
char buf[16];
ssize_t ret = read (stdout_pipe[0], buf, sizeof (buf));
xclose (stdout_pipe[0]);
/* ISO-8859-1 encoding of "äöü\n". */
TEST_COMPARE_BLOB (buf, ret, "\xe4\xf6\xfc\n", 4);
int status;
xwaitpid (pid, &status, 0);
TEST_COMPARE (status, 0);
/* Check that nothing has been written to stderr. */
ret = read (stderr_pipe[0], buf, sizeof (buf));
TEST_COMPARE (ret, 0);
xclose (stderr_pipe[0]);
support_spawn_wrapped_free (w);
free (iconv_prog);
}
static int
do_test (void)
{
char *program = xasprintf ("%s/support/tst-support_spawn_wrap",
support_objdir_root);
{
char *env[] = { (char *) "recurse=", (char *) "argc=1", NULL };
struct support_spawn_wrapped *w
= support_spawn_wrap (program, NULL, env, 0);
struct support_capture_subprocess proc
= support_capture_subprogram (w->path, w->argv, w->envp);
support_capture_subprocess_check (&proc, "no arguments", 0, sc_allow_none);
support_capture_subprocess_free (&proc);
support_spawn_wrapped_free (w);
}
{
char *argv[] = { (char *) "program", (char *) "--recurse", NULL };
struct support_spawn_wrapped *w
= support_spawn_wrap (program, argv, NULL, 0);
struct support_capture_subprocess proc
= support_capture_subprogram (w->path, w->argv, w->envp);
support_capture_subprocess_check (&proc, "default envvironment", 0,
sc_allow_none);
support_capture_subprocess_free (&proc);
support_spawn_wrapped_free (w);
}
{
char *argv[] = { (char *) "program", (char *) "alpha", (char *) "beta",
(char *) "gamma", NULL };
char *env[] = { (char *) "recurse=", (char *) "argc=4", NULL };
struct support_spawn_wrapped *w
= support_spawn_wrap (program, argv, env, 0);
struct support_capture_subprocess proc
= support_capture_subprogram (w->path, w->argv, w->envp);
support_capture_subprocess_check (&proc, "3 arguments", 0, sc_allow_none);
support_capture_subprocess_free (&proc);
support_spawn_wrapped_free (w);
}
{
char *argv[] = { (char *) "program", (char *) "check-env", NULL };
char *env[] = { (char *) "recurse=", (char *) "argc=2",
(char *) "extra=17", NULL };
struct support_spawn_wrapped *w
= support_spawn_wrap (program, argv, env, 0);
struct support_capture_subprocess proc
= support_capture_subprogram (w->path, w->argv, w->envp);
TEST_COMPARE_STRING (proc.out.buffer, "2 17\n");
support_capture_subprocess_check (&proc, "check-env", 0, sc_allow_stdout);
support_capture_subprocess_free (&proc);
support_spawn_wrapped_free (w);
}
test_iconv ();
/* This may trigger EXIT_UNSUPPORTED, so run this before the tests
that rely on running_via_ldso. */
TEST_COMPARE (!running_via_ldso (), support_hardcoded_paths_in_test);
{
char *argv[] = { (char *) "program", (char *) "check-ld.so", NULL };
char *env[] = { (char *) "recurse=", NULL };
struct support_spawn_wrapped *w
= support_spawn_wrap (program, argv, env, support_spawn_wrap_force);
struct support_capture_subprocess proc
= support_capture_subprogram (w->path, w->argv, w->envp);
support_capture_subprocess_check (&proc, "check-ld.so", 0, sc_allow_none);
support_capture_subprocess_free (&proc);
support_spawn_wrapped_free (w);
}
free (program);
return 0;
}
#include <support/test-driver.c>
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