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      1 /*
      2  * Copyright (c) 2015-2016 Dmitry V. Levin <ldv (at) altlinux.org>
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. The name of the author may not be used to endorse or promote products
     14  *    derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include "tests.h"
     29 #include <assert.h>
     30 #include <stdlib.h>
     31 #include <unistd.h>
     32 #include <pthread.h>
     33 #include <sys/wait.h>
     34 
     35 #define P 16
     36 #define T 7
     37 
     38 static void *
     39 thread(void *arg)
     40 {
     41 	assert(write(1, "", 1) == 1);
     42 	pause();
     43 	return arg;
     44 }
     45 
     46 static int
     47 process(void)
     48 {
     49 	int i;
     50 	int fds[2];
     51 	pthread_t t;
     52 	struct timespec ts = { .tv_nsec = 10000000 };
     53 
     54 	(void) close(0);
     55 	(void) close(1);
     56 	if (pipe(fds))
     57 		perror_msg_and_fail("pipe");
     58 
     59 	for (i = 0; i < T; ++i)
     60 		assert(pthread_create(&t, NULL, thread, NULL) == 0);
     61 	for (i = 0; i < T; ++i)
     62 		assert(read(0, fds, 1) == 1);
     63 
     64 	(void) nanosleep(&ts, 0);
     65 	return 0;
     66 }
     67 
     68 int
     69 main(void)
     70 {
     71 	int i, s;
     72 	pid_t p;
     73 
     74 	for (i = 0; i < P; ++i) {
     75 		p = fork();
     76 		if (p < 0)
     77 			perror_msg_and_fail("fork");
     78 		if (p == 0)
     79 			return process();
     80 		assert(waitpid(p, &s, 0) == p);
     81 		assert(WIFEXITED(s));
     82 		if (WEXITSTATUS(s))
     83 			return WEXITSTATUS(s);
     84 	}
     85 	return 0;
     86 }
     87