1 /*
2 *
3 * Copyright (c) International Business Machines Corp., 2001
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19
20 /*
21 * NAME
22 * pipe06.c
23 *
24 * DESCRIPTION
25 * Check what happens when the system runs out of pipes.
26 *
27 * ALGORITHM
28 * Issue enough pipe calls to run the system out of pipes.
29 * Check that we get EMFILE.
30 *
31 * USAGE: <for command-line>
32 * pipe06 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
33 * where, -c n : Run n copies concurrently.
34 * -e : Turn on errno logging.
35 * -i n : Execute test n times.
36 * -I x : Execute test for x seconds.
37 * -P x : Pause for x seconds between iterations.
38 * -t : Turn on syscall timing.
39 *
40 * HISTORY
41 * 07/2001 Ported by Wayne Boyer
42 *
43 * RESTRICTIONS
44 * None
45 */
46 #include <fcntl.h>
47 #include <errno.h>
48 #include "test.h"
49
50 char *TCID = "pipe06";
51 int TST_TOTAL = 1;
52
53 int pipe_ret, pipes[2];
54 void setup(void);
55 void cleanup(void);
56
main(int ac,char ** av)57 int main(int ac, char **av)
58 {
59 int lc;
60
61 tst_parse_opts(ac, av, NULL, NULL);
62
63 setup();
64
65 for (lc = 0; TEST_LOOPING(lc); lc++) {
66
67 /* reset tst_count in case we are looping */
68 tst_count = 0;
69
70 TEST(pipe(pipes));
71
72 if (TEST_RETURN != -1) {
73 tst_resm(TFAIL, "call succeeded unexpectedly");
74 }
75
76 if (TEST_ERRNO != EMFILE) {
77 tst_resm(TFAIL | TTERRNO, "pipe failed unexpectedly");
78 } else {
79 tst_resm(TPASS, "failed with EMFILE");
80 }
81
82 }
83 cleanup();
84 tst_exit();
85
86 }
87
88 /*
89 * setup() - performs all ONE TIME setup for this test.
90 */
setup(void)91 void setup(void)
92 {
93 int i, numb_fds;
94
95 tst_sig(NOFORK, DEF_HANDLER, cleanup);
96
97 TEST_PAUSE;
98
99 numb_fds = getdtablesize();
100
101 for (i = 0; i < numb_fds; i++) {
102 pipe_ret = pipe(pipes);
103 if (pipe_ret < 0) {
104 if (errno != EMFILE) {
105 tst_brkm(TBROK | TTERRNO, cleanup,
106 "didn't get EMFILE");
107 }
108 break;
109 }
110 }
111 }
112
113 /*
114 * cleanup() - performs all ONE TIME cleanup for this test at
115 * completion or premature exit.
116 */
cleanup(void)117 void cleanup(void)
118 {
119 }
120