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This patch is a rework of the following upstream patch:
commit 0e169691290a6d2187a4ff41495fc5678cbfdcdc
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Fri Apr 12 17:39:53 2019 -0300
support: Add support_capture_subprogram
Its API is similar to support_capture_subprocess, but rather creates a
new process based on the input path and arguments. Under the hoods it
uses posix_spawn to create the new process.
It also allows the use of other support_capture_* functions to check
for expected results and free the resources.
Checked on x86_64-linux-gnu.
* support/Makefile (libsupport-routines): Add support_subprocess,
xposix_spawn, xposix_spawn_file_actions_addclose, and
xposix_spawn_file_actions_adddup2.
(tst-support_capture_subprocess-ARGS): New rule.
* support/capture_subprocess.h (support_capture_subprogram): New
prototype.
* support/support_capture_subprocess.c (support_capture_subprocess):
Refactor to use support_subprocess and support_capture_poll.
(support_capture_subprogram): New function.
* support/tst-support_capture_subprocess.c (write_mode_to_str,
str_to_write_mode, test_common, parse_int, handle_restart,
do_subprocess, do_subprogram, do_multiple_tests): New functions.
(do_test): Add support_capture_subprogram tests.
* support/subprocess.h: New file.
* support/support_subprocess.c: Likewise.
* support/xposix_spawn.c: Likewise.
* support/xposix_spawn_file_actions_addclose.c: Likewise.
* support/xposix_spawn_file_actions_adddup2.c: Likewise.
* support/xspawn.h: Likewise.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
diff -Nrup a/support/capture_subprocess.h b/support/capture_subprocess.h
--- a/support/capture_subprocess.h 2018-08-01 01:10:47.000000000 -0400
+++ b/support/capture_subprocess.h 2019-05-16 23:37:19.903845257 -0400
@@ -35,6 +35,12 @@ struct support_capture_subprocess
struct support_capture_subprocess support_capture_subprocess
(void (*callback) (void *), void *closure);
+/* Issue FILE with ARGV arguments by using posix_spawn and capture standard
+ output, standard error, and the exit status. The out.buffer and err.buffer
+ are handle as support_capture_subprocess. */
+struct support_capture_subprocess support_capture_subprogram
+ (const char *file, char *const argv[]);
+
/* Deallocate the subprocess data captured by
support_capture_subprocess. */
void support_capture_subprocess_free (struct support_capture_subprocess *);
diff -Nrup a/support/Makefile b/support/Makefile
--- a/support/Makefile 2019-05-16 23:36:51.066665814 -0400
+++ b/support/Makefile 2019-05-17 10:31:24.268313761 -0400
@@ -63,6 +63,7 @@ libsupport-routines = \
support_record_failure \
support_run_diff \
support_shared_allocate \
+ support_subprocess \
support_test_compare_blob \
support_test_compare_failure \
support_test_compare_string \
@@ -147,6 +148,9 @@ libsupport-routines = \
xsigaction \
xsignal \
xsocket \
+ xposix_spawn \
+ xposix_spawn_file_actions_addclose \
+ xposix_spawn_file_actions_adddup2 \
xstrdup \
xstrndup \
xsymlink \
@@ -221,4 +225,6 @@ endif
$(objpfx)tst-support_format_dns_packet: $(common-objpfx)resolv/libresolv.so
+tst-support_capture_subprocess-ARGS = -- $(host-test-program-cmd)
+
include ../Rules
diff -Nrup a/support/subprocess.h b/support/subprocess.h
--- a/support/subprocess.h 1969-12-31 19:00:00.000000000 -0500
+++ b/support/subprocess.h 2019-05-16 23:37:19.903845257 -0400
@@ -0,0 +1,49 @@
+/* Create a subprocess.
+ Copyright (C) 2019 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/>. */
+
+#ifndef SUPPORT_SUBPROCESS_H
+#define SUPPORT_SUBPROCESS_H
+
+#include <sys/types.h>
+
+struct support_subprocess
+{
+ int stdout_pipe[2];
+ int stderr_pipe[2];
+ pid_t pid;
+};
+
+/* Invoke CALLBACK (CLOSURE) in a subprocess created with fork and return
+ its PID, a pipe redirected to STDOUT, and a pipe redirected to STDERR. */
+struct support_subprocess support_subprocess
+ (void (*callback) (void *), void *closure);
+
+/* Issue FILE with ARGV arguments by using posix_spawn and return is PID, a
+ pipe redirected to STDOUT, and a pipe redirected to STDERR. */
+struct support_subprocess support_subprogram
+ (const char *file, char *const argv[]);
+
+/* Wait for the subprocess indicated by PROC::PID. Return the status
+ indicate by waitpid call. */
+int support_process_wait (struct support_subprocess *proc);
+
+/* Terminate the subprocess indicated by PROC::PID, first with a SIGTERM and
+ then with a SIGKILL. Return the status as for waitpid call. */
+int support_process_terminate (struct support_subprocess *proc);
+
+#endif
diff -Nrup a/support/support_capture_subprocess.c b/support/support_capture_subprocess.c
--- a/support/support_capture_subprocess.c 2019-05-16 23:36:50.672677025 -0400
+++ b/support/support_capture_subprocess.c 2019-05-16 23:38:34.298728367 -0400
@@ -16,6 +16,7 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
+#include <support/subprocess.h>
#include <support/capture_subprocess.h>
#include <errno.h>
@@ -23,6 +24,7 @@
#include <support/check.h>
#include <support/xunistd.h>
#include <support/xsocket.h>
+#include <support/xspawn.h>
static void
transfer (const char *what, struct pollfd *pfd, struct xmemstream *stream)
@@ -50,59 +52,52 @@ transfer (const char *what, struct pollf
}
}
-struct support_capture_subprocess
-support_capture_subprocess (void (*callback) (void *), void *closure)
+static void
+support_capture_poll (struct support_capture_subprocess *result,
+ struct support_subprocess *proc)
{
- struct support_capture_subprocess result;
- xopen_memstream (&result.out);
- xopen_memstream (&result.err);
-
- int stdout_pipe[2];
- xpipe (stdout_pipe);
- TEST_VERIFY (stdout_pipe[0] > STDERR_FILENO);
- TEST_VERIFY (stdout_pipe[1] > STDERR_FILENO);
- int stderr_pipe[2];
- xpipe (stderr_pipe);
- TEST_VERIFY (stderr_pipe[0] > STDERR_FILENO);
- TEST_VERIFY (stderr_pipe[1] > STDERR_FILENO);
-
- TEST_VERIFY (fflush (stdout) == 0);
- TEST_VERIFY (fflush (stderr) == 0);
-
- pid_t pid = xfork ();
- if (pid == 0)
- {
- xclose (stdout_pipe[0]);
- xclose (stderr_pipe[0]);
- xdup2 (stdout_pipe[1], STDOUT_FILENO);
- xdup2 (stderr_pipe[1], STDERR_FILENO);
- xclose (stdout_pipe[1]);
- xclose (stderr_pipe[1]);
- callback (closure);
- _exit (0);
- }
- xclose (stdout_pipe[1]);
- xclose (stderr_pipe[1]);
-
struct pollfd fds[2] =
{
- { .fd = stdout_pipe[0], .events = POLLIN },
- { .fd = stderr_pipe[0], .events = POLLIN },
+ { .fd = proc->stdout_pipe[0], .events = POLLIN },
+ { .fd = proc->stderr_pipe[0], .events = POLLIN },
};
do
{
xpoll (fds, 2, -1);
- transfer ("stdout", &fds[0], &result.out);
- transfer ("stderr", &fds[1], &result.err);
+ transfer ("stdout", &fds[0], &result->out);
+ transfer ("stderr", &fds[1], &result->err);
}
while (fds[0].events != 0 || fds[1].events != 0);
- xclose (stdout_pipe[0]);
- xclose (stderr_pipe[0]);
+ xfclose_memstream (&result->out);
+ xfclose_memstream (&result->err);
+
+ result->status = support_process_wait (proc);
+}
+
+struct support_capture_subprocess
+support_capture_subprocess (void (*callback) (void *), void *closure)
+{
+ struct support_capture_subprocess result;
+ xopen_memstream (&result.out);
+ xopen_memstream (&result.err);
+
+ struct support_subprocess proc = support_subprocess (callback, closure);
+
+ support_capture_poll (&result, &proc);
+ return result;
+}
+
+struct support_capture_subprocess
+support_capture_subprogram (const char *file, char *const argv[])
+{
+ struct support_capture_subprocess result;
+ xopen_memstream (&result.out);
+ xopen_memstream (&result.err);
+
+ struct support_subprocess proc = support_subprogram (file, argv);
- xfclose_memstream (&result.out);
- xfclose_memstream (&result.err);
- xwaitpid (pid, &result.status, 0);
+ support_capture_poll (&result, &proc);
return result;
}
diff -Nrup a/support/support_subprocess.c b/support/support_subprocess.c
--- a/support/support_subprocess.c 1969-12-31 19:00:00.000000000 -0500
+++ b/support/support_subprocess.c 2019-05-16 23:37:19.903845257 -0400
@@ -0,0 +1,152 @@
+/* Create subprocess.
+ Copyright (C) 2019 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 <signal.h>
+#include <time.h>
+#include <sys/wait.h>
+#include <stdbool.h>
+#include <support/xspawn.h>
+#include <support/check.h>
+#include <support/xunistd.h>
+#include <support/subprocess.h>
+
+static struct support_subprocess
+support_suprocess_init (void)
+{
+ struct support_subprocess result;
+
+ xpipe (result.stdout_pipe);
+ TEST_VERIFY (result.stdout_pipe[0] > STDERR_FILENO);
+ TEST_VERIFY (result.stdout_pipe[1] > STDERR_FILENO);
+
+ xpipe (result.stderr_pipe);
+ TEST_VERIFY (result.stderr_pipe[0] > STDERR_FILENO);
+ TEST_VERIFY (result.stderr_pipe[1] > STDERR_FILENO);
+
+ TEST_VERIFY (fflush (stdout) == 0);
+ TEST_VERIFY (fflush (stderr) == 0);
+
+ return result;
+}
+
+struct support_subprocess
+support_subprocess (void (*callback) (void *), void *closure)
+{
+ struct support_subprocess result = support_suprocess_init ();
+
+ result.pid = xfork ();
+ if (result.pid == 0)
+ {
+ xclose (result.stdout_pipe[0]);
+ xclose (result.stderr_pipe[0]);
+ xdup2 (result.stdout_pipe[1], STDOUT_FILENO);
+ xdup2 (result.stderr_pipe[1], STDERR_FILENO);
+ xclose (result.stdout_pipe[1]);
+ xclose (result.stderr_pipe[1]);
+ callback (closure);
+ _exit (0);
+ }
+ xclose (result.stdout_pipe[1]);
+ xclose (result.stderr_pipe[1]);
+
+ return result;
+}
+
+struct support_subprocess
+support_subprogram (const char *file, char *const argv[])
+{
+ struct support_subprocess result = support_suprocess_init ();
+
+ posix_spawn_file_actions_t fa;
+ /* posix_spawn_file_actions_init does not fail. */
+ posix_spawn_file_actions_init (&fa);
+
+ xposix_spawn_file_actions_addclose (&fa, result.stdout_pipe[0]);
+ xposix_spawn_file_actions_addclose (&fa, result.stderr_pipe[0]);
+ xposix_spawn_file_actions_adddup2 (&fa, result.stdout_pipe[1], STDOUT_FILENO);
+ xposix_spawn_file_actions_adddup2 (&fa, result.stderr_pipe[1], STDERR_FILENO);
+ xposix_spawn_file_actions_addclose (&fa, result.stdout_pipe[1]);
+ xposix_spawn_file_actions_addclose (&fa, result.stderr_pipe[1]);
+
+ result.pid = xposix_spawn (file, &fa, NULL, argv, NULL);
+
+ xclose (result.stdout_pipe[1]);
+ xclose (result.stderr_pipe[1]);
+
+ return result;
+}
+
+int
+support_process_wait (struct support_subprocess *proc)
+{
+ xclose (proc->stdout_pipe[0]);
+ xclose (proc->stderr_pipe[0]);
+
+ int status;
+ xwaitpid (proc->pid, &status, 0);
+ return status;
+}
+
+
+static bool
+support_process_kill (int pid, int signo, int *status)
+{
+ /* Kill the whole process group. */
+ kill (-pid, signo);
+ /* In case setpgid failed in the child, kill it individually too. */
+ kill (pid, signo);
+
+ /* Wait for it to terminate. */
+ pid_t killed;
+ for (int i = 0; i < 5; ++i)
+ {
+ int status;
+ killed = xwaitpid (pid, &status, WNOHANG|WUNTRACED);
+ if (killed != 0)
+ break;
+
+ /* Delay, give the system time to process the kill. If the
+ nanosleep() call return prematurely, all the better. We
+ won't restart it since this probably means the child process
+ finally died. */
+ nanosleep (&((struct timespec) { 0, 100000000 }), NULL);
+ }
+ if (killed != 0 && killed != pid)
+ return false;
+
+ return true;
+}
+
+int
+support_process_terminate (struct support_subprocess *proc)
+{
+ xclose (proc->stdout_pipe[0]);
+ xclose (proc->stderr_pipe[0]);
+
+ int status;
+ pid_t killed = xwaitpid (proc->pid, &status, WNOHANG|WUNTRACED);
+ if (killed != 0 && killed == proc->pid)
+ return status;
+
+ /* Subprocess is still running, terminate it. */
+ if (!support_process_kill (proc->pid, SIGTERM, &status) )
+ support_process_kill (proc->pid, SIGKILL, &status);
+
+ return status;
+}
diff -Nrup a/support/tst-support_capture_subprocess.c b/support/tst-support_capture_subprocess.c
--- a/support/tst-support_capture_subprocess.c 2018-08-01 01:10:47.000000000 -0400
+++ b/support/tst-support_capture_subprocess.c 2019-05-16 23:37:19.904845228 -0400
@@ -23,8 +23,20 @@
#include <support/capture_subprocess.h>
#include <support/check.h>
#include <support/support.h>
+#include <support/temp_file.h>
#include <sys/wait.h>
#include <unistd.h>
+#include <paths.h>
+#include <getopt.h>
+#include <limits.h>
+#include <errno.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. */
+static char *initial_argv[5];
/* Write one byte at *P to FD and advance *P. Do nothing if *P is
'\0'. */
@@ -42,6 +54,30 @@ transfer (const unsigned char **p, int f
enum write_mode { out_first, err_first, interleave,
write_mode_last = interleave };
+static const char *
+write_mode_to_str (enum write_mode mode)
+{
+ switch (mode)
+ {
+ case out_first: return "out_first";
+ case err_first: return "err_first";
+ case interleave: return "interleave";
+ default: return "write_mode_last";
+ }
+}
+
+static enum write_mode
+str_to_write_mode (const char *mode)
+{
+ if (strcmp (mode, "out_first") == 0)
+ return out_first;
+ else if (strcmp (mode, "err_first") == 0)
+ return err_first;
+ else if (strcmp (mode, "interleave") == 0)
+ return interleave;
+ return write_mode_last;
+}
+
/* Describe what to write in the subprocess. */
struct test
{
@@ -52,11 +88,9 @@ struct test
int status;
};
-/* For use with support_capture_subprocess. */
-static void
-callback (void *closure)
+_Noreturn static void
+test_common (const struct test *test)
{
- const struct test *test = closure;
bool mode_ok = false;
switch (test->write_mode)
{
@@ -95,6 +129,40 @@ callback (void *closure)
exit (test->status);
}
+static int
+parse_int (const char *str)
+{
+ char *endptr;
+ long int ret = strtol (str, &endptr, 10);
+ TEST_COMPARE (errno, 0);
+ TEST_VERIFY (ret >= 0 && ret <= INT_MAX);
+ return ret;
+}
+
+/* For use with support_capture_subprogram. */
+_Noreturn static void
+handle_restart (char *out, char *err, const char *write_mode,
+ const char *signal, const char *status)
+{
+ struct test test =
+ {
+ out,
+ err,
+ str_to_write_mode (write_mode),
+ parse_int (signal),
+ parse_int (status)
+ };
+ test_common (&test);
+}
+
+/* For use with support_capture_subprocess. */
+_Noreturn static void
+callback (void *closure)
+{
+ const struct test *test = closure;
+ test_common (test);
+}
+
/* Create a heap-allocated random string of letters. */
static char *
random_string (size_t length)
@@ -130,12 +198,59 @@ check_stream (const char *what, const st
}
}
+static struct support_capture_subprocess
+do_subprocess (struct test *test)
+{
+ return support_capture_subprocess (callback, test);
+}
+
+static struct support_capture_subprocess
+do_subprogram (const struct test *test)
+{
+ /* Three digits per byte plus null terminator. */
+ char signalstr[3 * sizeof(int) + 1];
+ snprintf (signalstr, sizeof (signalstr), "%d", test->signal);
+ char statusstr[3 * sizeof(int) + 1];
+ snprintf (statusstr, sizeof (statusstr), "%d", test->status);
+
+ int argc = 0;
+ enum {
+ /* 4 elements from initial_argv (path to ld.so, '--library-path', the
+ path', and application name'), 2 for restart argument ('--direct',
+ '--restart'), 5 arguments plus NULL. */
+ argv_size = 12
+ };
+ char *args[argv_size];
+
+ for (char **arg = initial_argv; *arg != NULL; arg++)
+ args[argc++] = *arg;
+
+ args[argc++] = (char*) "--direct";
+ args[argc++] = (char*) "--restart";
+
+ args[argc++] = test->out;
+ args[argc++] = test->err;
+ args[argc++] = (char*) write_mode_to_str (test->write_mode);
+ args[argc++] = signalstr;
+ args[argc++] = statusstr;
+ args[argc] = NULL;
+ TEST_VERIFY (argc < argv_size);
+
+ return support_capture_subprogram (args[0], args);
+}
+
+enum test_type
+{
+ subprocess,
+ subprogram,
+};
+
static int
-do_test (void)
+do_multiple_tests (enum test_type type)
{
const int lengths[] = {0, 1, 17, 512, 20000, -1};
- /* Test multiple combinations of support_capture_subprocess.
+ /* Test multiple combinations of support_capture_sub{process,program}.
length_idx_stdout: Index into the lengths array above,
controls how many bytes are written by the subprocess to
@@ -164,8 +279,10 @@ do_test (void)
TEST_VERIFY (strlen (test.out) == lengths[length_idx_stdout]);
TEST_VERIFY (strlen (test.err) == lengths[length_idx_stderr]);
- struct support_capture_subprocess result
- = support_capture_subprocess (callback, &test);
+ struct support_capture_subprocess result
+ = type == subprocess ? do_subprocess (&test)
+ : do_subprogram (&test);
+
check_stream ("stdout", &result.out, test.out);
check_stream ("stderr", &result.err, test.err);
if (test.signal != 0)
@@ -185,4 +302,54 @@ do_test (void)
return 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 stdout to print
+ + argv[3]: the stderr to print
+ + argv[4]: the write mode to use
+ + argv[5]: the signal to issue
+ + argv[6]: the exit status code to use
+
+ * When built with --enable-hardcoded-path-in-tests or issued without
+ using the loader directly.
+ */
+
+ if (argc != (restart ? 6 : 5) && argc != (restart ? 6 : 2))
+ FAIL_EXIT1 ("wrong number of arguments (%d)", argc);
+
+ if (restart)
+ {
+ handle_restart (argv[1], /* stdout */
+ argv[2], /* stderr */
+ argv[3], /* write_mode */
+ argv[4], /* signal */
+ argv[5]); /* status */
+ }
+
+ initial_argv[0] = argv[1]; /* path for ld.so */
+ initial_argv[1] = argv[2]; /* "--library-path" */
+ initial_argv[2] = argv[3]; /* the library path */
+ initial_argv[3] = argv[4]; /* the application name */
+ initial_argv[4] = NULL;
+
+ do_multiple_tests (subprocess);
+ do_multiple_tests (subprogram);
+
+ return 0;
+}
+
+#define CMDLINE_OPTIONS \
+ { "restart", no_argument, &restart, 1 },
+#define TEST_FUNCTION_ARGV do_test
#include <support/test-driver.c>
diff -Nrup a/support/xposix_spawn.c b/support/xposix_spawn.c
--- a/support/xposix_spawn.c 1969-12-31 19:00:00.000000000 -0500
+++ b/support/xposix_spawn.c 2019-05-16 23:37:19.904845228 -0400
@@ -0,0 +1,32 @@
+/* xposix_spawn implementation.
+ Copyright (C) 2019 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 <support/xspawn.h>
+#include <support/check.h>
+
+pid_t
+xposix_spawn (const char *file, const posix_spawn_file_actions_t *fa,
+ const posix_spawnattr_t *attr, char *const args[],
+ char *const envp[])
+{
+ pid_t pid;
+ int status = posix_spawn (&pid, file, fa, attr, args, envp);
+ if (status != 0)
+ FAIL_EXIT1 ("posix_spawn to %s file failed: %m", file);
+ return pid;
+}
diff -Nrup a/support/xposix_spawn_file_actions_addclose.c b/support/xposix_spawn_file_actions_addclose.c
--- a/support/xposix_spawn_file_actions_addclose.c 1969-12-31 19:00:00.000000000 -0500
+++ b/support/xposix_spawn_file_actions_addclose.c 2019-05-16 23:37:19.904845228 -0400
@@ -0,0 +1,29 @@
+/* xposix_spawn_file_actions_addclose implementation.
+ Copyright (C) 2019 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 <support/xspawn.h>
+#include <support/check.h>
+
+int
+xposix_spawn_file_actions_addclose (posix_spawn_file_actions_t *fa, int fd)
+{
+ int status = posix_spawn_file_actions_addclose (fa, fd);
+ if (status == -1)
+ FAIL_EXIT1 ("posix_spawn_file_actions_addclose failed: %m\n");
+ return status;
+}
diff -Nrup a/support/xposix_spawn_file_actions_adddup2.c b/support/xposix_spawn_file_actions_adddup2.c
--- a/support/xposix_spawn_file_actions_adddup2.c 1969-12-31 19:00:00.000000000 -0500
+++ b/support/xposix_spawn_file_actions_adddup2.c 2019-05-16 23:37:19.904845228 -0400
@@ -0,0 +1,30 @@
+/* xposix_spawn_file_actions_adddup2 implementation.
+ Copyright (C) 2019 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 <support/xspawn.h>
+#include <support/check.h>
+
+int
+xposix_spawn_file_actions_adddup2 (posix_spawn_file_actions_t *fa, int fd,
+ int newfd)
+{
+ int status = posix_spawn_file_actions_adddup2 (fa, fd, newfd);
+ if (status == -1)
+ FAIL_EXIT1 ("posix_spawn_file_actions_adddup2 failed: %m\n");
+ return status;
+}
diff -Nrup a/support/xspawn.h b/support/xspawn.h
--- a/support/xspawn.h 1969-12-31 19:00:00.000000000 -0500
+++ b/support/xspawn.h 2019-05-16 23:37:19.904845228 -0400
@@ -0,0 +1,34 @@
+/* posix_spawn with support checks.
+ Copyright (C) 2019 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/>. */
+
+#ifndef SUPPORT_XSPAWN_H
+#define SUPPORT_XSPAWN_H
+
+#include <spawn.h>
+
+__BEGIN_DECLS
+
+int xposix_spawn_file_actions_addclose (posix_spawn_file_actions_t *, int);
+int xposix_spawn_file_actions_adddup2 (posix_spawn_file_actions_t *, int, int);
+
+pid_t xposix_spawn (const char *, const posix_spawn_file_actions_t *,
+ const posix_spawnattr_t *, char *const [], char *const []);
+
+__END_DECLS
+
+#endif
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