xref: /freebsd-src/tests/sys/kern/pipe/pipe_overcommit2_test.c (revision 76f2606181eabc8ab20aa7297bbddc6e78bb549d)
1 /*-
2  * Copyright (C) 2005 Michael J. Silbersack <silby@freebsd.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(s), this list of conditions and the following disclaimer as
10  *    the first lines of this file unmodified other than the possible
11  *    addition of one or more copyright notices.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice(s), this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
17  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19  * DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
23  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
26  * DAMAGE.
27  */
28 
29 #include <sys/param.h>
30 #include <sys/stat.h>
31 #include <err.h>
32 #include <errno.h>
33 #include <fcntl.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <unistd.h>
37 
38 /*
39  * $FreeBSD$
40  * This program tests how sys_pipe.c handles the case where there
41  * is ample memory to allocate a pipe, but the file descriptor
42  * limit for that user has been exceeded.
43  */
44 
45 int
46 main(void)
47 {
48 	char template[] = "pipe.XXXXXXXXXX";
49 	int lastfd, pipes[10000], returnval;
50 	unsigned int i;
51 
52 	lastfd = -1;
53 
54 	umask(0077);
55 	if (mkstemp(template) == -1)
56 		err(1, "mkstemp failed");
57 
58 	for (i = 0; i < nitems(pipes); i++) {
59 		returnval = open(template, O_RDONLY);
60 		if (returnval == -1 && (errno == ENFILE || errno == EMFILE))
61 			break; /* All descriptors exhausted. */
62 		else
63 			lastfd = returnval;
64 	}
65 
66 	/* First falloc failure case in sys_pipe.c:pipe() */
67 	for (i = 0; i < 1000; i++) {
68 		returnval = pipe(&pipes[i]);
69 	}
70 
71 	/*
72 	 * Free just one FD so that the second falloc failure
73 	 * case will occur.
74 	 */
75 	close(lastfd);
76 
77 	for (i = 0; i < 1000; i++) {
78 		returnval = pipe(&pipes[i]);
79 	}
80 	printf("PASS\n");
81 
82 	unlink(template);
83 
84 	exit(0);
85 }
86