/usr/include/nih/test_process.h is in libnih-dev 1.0.3-4ubuntu25.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* Copyright © 2009 Scott James Remnant <scott@netsplit.com>.
* Copyright © 2009 Canonical Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2, as
* published by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef NIH_TEST_PROCESS_H
#define NIH_TEST_PROCESS_H
#ifndef NIH_IN_TEST_H
# error "This header may only be included by <nih/test.h>"
#endif /* NIH_IN_TEST_H */
#include <sys/types.h>
#include <unistd.h>
/**
* TEST_CHILD:
* @_pid: variable to store pid in.
*
* Spawn a child in which a test can be performed without affecting the
* main flow of the process. The pid of the child is stored in @_pid.
*
* This macro ensures that the child has begun execution before the
* parent is allowed to continue through the usual use of a pipe.
*
* A block of code should follow this macro, which is the code that will
* be run in the child process; if the block ends, the child will abort.
**/
#define TEST_CHILD(_pid) \
do { \
int _test_fds[2]; \
fflush (stdout); \
fflush (stderr); \
assert0 (pipe (_test_fds)); \
_pid = fork (); \
if (_pid > 0) { \
char _test_buf[1]; \
close (_test_fds[1]); \
assert (read (_test_fds[0], _test_buf, 1) == 1); \
close (_test_fds[0]); \
} else if (_pid == 0) { \
close (_test_fds[0]); \
assert (write (_test_fds[1], "\n", 1) == 1); \
close (_test_fds[1]); \
} \
} while (0); \
if (_pid == 0) \
for (int _test_child = 0; _test_child < 2; _test_child++) \
if (_test_child) { \
abort (); \
} else
/**
* TEST_CHILD_WAIT:
* @_pid: variable to store pid in,
* @_fd: variable to store lock fd in.
*
* Spawn a child in which a test can be performed while the parent waits
* in this macro for the child to reach the TEST_CHILD_RELEASE macro
* or die.
*
* The pid of the child is stored in @_pid, a file descriptor is stored
* in the @_fd variable which is used by the TEST_CHILD_RELEASE macro.
*
* A block of code should follow this macro, which is the code that will
* be run in the child process; if the block ends, the child will abort.
**/
#define TEST_CHILD_WAIT(_pid, _fd) \
do { \
int _test_fds[2]; \
fflush (stdout); \
fflush (stderr); \
assert0 (pipe (_test_fds)); \
_pid = fork (); \
if (_pid > 0) { \
char _test_buf[1]; \
close (_test_fds[1]); \
assert (read (_test_fds[0], _test_buf, 1) == 1); \
close (_test_fds[0]); \
} else if (_pid == 0) { \
close (_test_fds[0]); \
_fd = _test_fds[1]; \
} \
} while (0); \
if (_pid == 0) \
for (int _test_child = 0; _test_child < 2; _test_child++) \
if (_test_child) { \
abort (); \
} else
/**
* TEST_CHILD_RELEASE:
* @_fd: variable lock fd stored in.
*
* Release the parent of a child spawned by TEST_CHILD_WAIT now that the
* child has reached the critical point.
**/
#define TEST_CHILD_RELEASE(_fd) \
do { \
assert (write ((_fd), "\n", 1) == 1); \
close (_fd); \
} while (0)
#endif /* NIH_TEST_PROCESS_H */
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