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support: Add support_capture_subprogram

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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>
This commit is contained in:
Adhemerval Zanella
2019-04-12 17:39:53 -03:00
parent bae8cf0e93
commit 0e16969129
11 changed files with 573 additions and 50 deletions
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support/subprocess.h Normal file
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/* 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