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      1 /*
      2  * This file is part of attach-p-cmd strace test.
      3  *
      4  * Copyright (c) 2016-2017 Dmitry V. Levin <ldv (at) altlinux.org>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #include "tests.h"
     31 #include <errno.h>
     32 #include <stdio.h>
     33 #include <sys/stat.h>
     34 #include <unistd.h>
     35 #include "attach-p-cmd.h"
     36 
     37 static void
     38 write_pidfile(const pid_t pid)
     39 {
     40 	FILE *fp = fopen(pidfile, "w");
     41 	if (!fp)
     42 		perror_msg_and_fail("fopen: %s", pidfile);
     43 
     44 	if (fprintf(fp, "%d", pid) < 0)
     45 		perror_msg_and_fail("fprintf: %s", pidfile);
     46 
     47 	if (fclose(fp))
     48 		perror_msg_and_fail("fclose: %s", pidfile);
     49 }
     50 
     51 static void
     52 wait_for_peer_invocation(void)
     53 {
     54 	/* wait for the lock directory to be created by peer */
     55 	while (rmdir(lockdir)) {
     56 		if (ENOENT != errno)
     57 			perror_msg_and_fail("rmdir: %s", lockdir);
     58 	}
     59 }
     60 
     61 int
     62 main(void)
     63 {
     64 	const pid_t pid = getpid();
     65 	write_pidfile(pid);
     66 
     67 	wait_for_peer_invocation();
     68 
     69 	static const char dir[] = "attach-p-cmd.test cmd";
     70 	int rc = chdir(dir);
     71 
     72 	printf("%-5d chdir(\"%s\") = %s\n"
     73 	       "%-5d +++ exited with 0 +++\n",
     74 	       pid, dir, sprintrc(rc), pid);
     75 
     76 	return 0;
     77 }
     78