Home | History | Annotate | Download | only in tests 
      1 /*
      2  * Copyright (c) 2015 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 #ifdef HAVE_CONFIG_H
     29 # include "config.h"
     30 #endif
     31 
     32 #include <stdio.h>
     33 #include <string.h>
     34 #include <unistd.h>
     35 #include <sys/wait.h>
     36 
     37 static int
     38 logit(const char *const str)
     39 {
     40 	return pwrite(-1, str, strlen(str), 0) >= 0;
     41 }
     42 
     43 int main(int ac, char **av, char **ep)
     44 {
     45 	if (ac < 1)
     46 		return 1;
     47 	if (ac > 1)
     48 		return logit(av[1]);
     49 
     50 	logit("start");
     51 
     52 	int fds[2];
     53 	(void) close(0);
     54 	if (pipe(fds)) {
     55 		perror("pipe");
     56 		return 77;
     57 	}
     58 
     59 	pid_t pid = fork();
     60 
     61 	if (pid < 0) {
     62 		perror("fork");
     63 		return 77;
     64 	}
     65 
     66 	if (!pid) {
     67 		close(fds[1]);
     68 
     69 		if (read(0, fds, sizeof(int)))
     70 			_exit(2);
     71 
     72 		char *const args[] = { av[0], (char *) "exec", NULL };
     73 		if (logit("child") || execve(args[0], args, args + 1))
     74 			_exit(2);
     75 	}
     76 
     77 	close(0);
     78 
     79 	logit("parent");
     80 	close(fds[1]);
     81 
     82 	int status;
     83 	if (wait(&status) != pid) {
     84 		perror("wait");
     85 		return 77;
     86 	}
     87 	if (status) {
     88 		fprintf(stderr, "status = %d\n", status);
     89 		return 77;
     90 	}
     91 
     92 	logit("finish");
     93 
     94 	pid_t ppid = getpid();
     95 	close(-1);
     96 	printf("%-5d pwrite64(-1, \"start\", 5, 0) = -1 EBADF (%m)\n"
     97 	       "%-5d pwrite64(-1, \"parent\", 6, 0) = -1 EBADF (%m)\n"
     98 	       "%-5d pwrite64(-1, \"child\", 5, 0) = -1 EBADF (%m)\n"
     99 	       "%-5d pwrite64(-1, \"exec\", 4, 0) = -1 EBADF (%m)\n"
    100 	       "%-5d pwrite64(-1, \"finish\", 6, 0) = -1 EBADF (%m)\n",
    101 	       ppid, ppid, pid, pid, ppid);
    102 	return 0;
    103 }
    104