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 * pipe10.c
23 *
24 * DESCRIPTION
25 * Check that parent can open a pipe and have a child read from it
26 *
27 * ALGORITHM
28 * Parent opens pipe, child reads. Passes if child can read all the
29 * characters written by the parent.
30 *
31 * USAGE: <for command-line>
32 * pipe10 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
33 * where, -c n : Run n copies concurrently.
34 * -f : Turn off functionality Testing.
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 <errno.h>
47 #include <unistd.h>
48 #include <sys/wait.h>
49 #include <string.h>
50 #include "test.h"
51
52 char *TCID = "pipe10";
53 int TST_TOTAL = 1;
54
55 void setup(void);
56 void cleanup(void);
57
do_read(int fd,void * buf,size_t count)58 ssize_t do_read(int fd, void *buf, size_t count)
59 {
60 ssize_t n;
61
62 do {
63 n = read(fd, buf, count);
64 } while (n < 0 && errno == EINTR);
65
66 return n;
67 }
68
main(int ac,char ** av)69 int main(int ac, char **av)
70 {
71 int lc;
72
73 int fd[2]; /* fds for pipe read/write */
74 char wrbuf[BUFSIZ], rebuf[BUFSIZ];
75 int red, written; /* no of chars read and */
76 /* written to pipe */
77 int length, greater, forkstat;
78 int retval = 0, status, e_code;
79
80 tst_parse_opts(ac, av, NULL, NULL);
81
82 setup();
83
84 for (lc = 0; TEST_LOOPING(lc); lc++) {
85
86 /* reset tst_count in case we are looping */
87 tst_count = 0;
88
89 TEST(pipe(fd));
90
91 if (TEST_RETURN == -1) {
92 retval = 1;
93 tst_resm(TFAIL, "pipe creation failed");
94 continue;
95 }
96
97 strcpy(wrbuf, "abcdefghijklmnopqrstuvwxyz");
98 length = strlen(wrbuf) + 1;
99
100 written = write(fd[1], wrbuf, length);
101
102 /* did write write at least some chars */
103 if ((written < 0) || (written > length)) {
104 tst_brkm(TBROK, cleanup, "write to pipe failed");
105 }
106
107 forkstat = FORK_OR_VFORK();
108
109 if (forkstat == -1) {
110 tst_brkm(TBROK, cleanup, "fork() failed");
111 }
112
113 if (forkstat == 0) { /* child */
114 red = do_read(fd[0], rebuf, written);
115
116 /* did read , get at least some chars */
117 if ((red < 0) || (red > written)) {
118 tst_brkm(TBROK, cleanup, "read pipe failed");
119 }
120
121 greater = strcmp(rebuf, wrbuf);
122
123 /* are the strings written and read equal */
124 if (greater == 0) {
125 tst_resm(TPASS, "functionality is correct");
126 } else {
127 retval = 1;
128 tst_resm(TFAIL, "read & write strings do "
129 "not match");
130 }
131 exit(retval);
132 } else { /* parent */
133 /* wait for the child to finish */
134 wait(&status);
135 /* make sure the child returned a good exit status */
136 e_code = status >> 8;
137 if (e_code != 0) {
138 tst_resm(TFAIL, "Failures reported above");
139 }
140 }
141 }
142 cleanup();
143
144 tst_exit();
145 }
146
147 /*
148 * setup() - performs all ONE TIME setup for this test.
149 */
setup(void)150 void setup(void)
151 {
152
153 tst_sig(FORK, DEF_HANDLER, cleanup);
154
155 TEST_PAUSE;
156 }
157
158 /*
159 * cleanup() - performs all ONE TIME cleanup for this test at
160 * completion or premature exit.
161 */
cleanup(void)162 void cleanup(void)
163 {
164 }
165