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 * pipe08.c
23 *
24 * DESCRIPTION
25 * Check that a SIGPIPE signal is generated when a write is
26 * attempted on an empty pipe.
27 *
28 * ALGORITHM
29 * 1. Write to a pipe after closing the read side.
30 * 2. Check for the signal SIGPIPE to be received.
31 *
32 * USAGE: <for command-line>
33 * pipe08 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
34 * where, -c n : Run n copies concurrently.
35 * -f : Turn off functionality Testing.
36 * -i n : Execute test n times.
37 * -I x : Execute test for x seconds.
38 * -P x : Pause for x seconds between iterations.
39 * -t : Turn on syscall timing.
40 *
41 * USAGE
42 * pipe08
43 *
44 * HISTORY
45 * 07/2001 Ported by Wayne Boyer
46 *
47 * RESTRICTIONS
48 * None
49 */
50 #include <errno.h>
51 #include <unistd.h>
52 #include <signal.h>
53 #include <string.h>
54 #include "test.h"
55
56 char *TCID = "pipe08";
57 int TST_TOTAL = 1;
58
59 void setup(void);
60 void cleanup(void);
61 void sighandler(int);
62
main(int ac,char ** av)63 int main(int ac, char **av)
64 {
65 int lc;
66
67 int pipefd[2]; /* fds for pipe read/write */
68 char wrbuf[BUFSIZ];
69 int written, length;
70 int close_stat; /* exit status of close(read fd) */
71
72 tst_parse_opts(ac, av, NULL, NULL);
73
74 setup();
75
76 for (lc = 0; TEST_LOOPING(lc); lc++) {
77
78 /* reset tst_count in case we are looping */
79 tst_count = 0;
80
81 TEST(pipe(pipefd));
82
83 if (TEST_RETURN != 0) {
84 tst_resm(TFAIL, "call failed unexpectedly");
85 continue;
86 }
87
88 if ((close_stat = close(pipefd[0])) == -1) {
89 tst_brkm(TBROK, cleanup, "close of read side failed");
90 }
91
92 strcpy(wrbuf, "abcdefghijklmnopqrstuvwxyz\0");
93 length = strlen(wrbuf);
94
95 /*
96 * the SIGPIPE signal will be caught here or else
97 * the program will dump core when the signal is
98 * sent
99 */
100 written = write(pipefd[1], wrbuf, length);
101 if (written > 0)
102 tst_brkm(TBROK, cleanup, "write succeeded unexpectedly");
103 }
104 cleanup();
105 tst_exit();
106
107 }
108
109 /*
110 * sighandler - catch signals and look for SIGPIPE
111 */
sighandler(int sig)112 void sighandler(int sig)
113 {
114 if (sig != SIGPIPE)
115 tst_resm(TFAIL, "expected SIGPIPE, got %d", sig);
116 else
117 tst_resm(TPASS, "got expected SIGPIPE signal");
118 }
119
120 /*
121 * setup() - performs all ONE TIME setup for this test.
122 */
setup(void)123 void setup(void)
124 {
125
126 tst_sig(NOFORK, sighandler, cleanup);
127
128 TEST_PAUSE;
129 }
130
131 /*
132 * cleanup() - performs all ONE TIME cleanup for this test at
133 * completion or premature exit.
134 */
cleanup(void)135 void cleanup(void)
136 {
137 }
138