plars | 865695b | 2001-08-27 22:15:12 +0000 | [diff] [blame] | 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | */ |
| 19 | |
| 20 | /* |
| 21 | * NAME |
| 22 | * pipe09.c |
| 23 | * |
| 24 | * DESCRIPTION |
| 25 | * Check that two processes can use the same pipe at the same time. |
| 26 | * |
| 27 | * ALGORITHM |
| 28 | * 1. Open a pipe |
| 29 | * 2. Fork a child which writes to the pipe |
| 30 | * 3. Fork another child which writes a different character to the pipe |
| 31 | * 4. Have the parent read from the pipe |
| 32 | * 5. It should get the characters from both children. |
| 33 | * |
| 34 | * USAGE: <for command-line> |
| 35 | * pipe09 [-c n] [-f] [-i n] [-I x] [-P x] [-t] |
| 36 | * where, -c n : Run n copies concurrently. |
| 37 | * -f : Turn off functionality Testing. |
| 38 | * -i n : Execute test n times. |
| 39 | * -I x : Execute test for x seconds. |
| 40 | * -P x : Pause for x seconds between iterations. |
| 41 | * -t : Turn on syscall timing. |
| 42 | * |
| 43 | * HISTORY |
| 44 | * 07/2001 Ported by Wayne Boyer |
| 45 | * |
| 46 | * RESTRICTIONS |
| 47 | * None |
| 48 | */ |
| 49 | #include <unistd.h> |
| 50 | #include <signal.h> |
| 51 | #include <wait.h> |
| 52 | #include <errno.h> |
| 53 | #include "test.h" |
| 54 | #include "usctest.h" |
| 55 | |
| 56 | #define PIPEWRTCNT 100 /* must be an even number */ |
| 57 | |
| 58 | char *TCID = "pipe09"; |
| 59 | int TST_TOTAL = 1; |
| 60 | extern int Tst_count; |
| 61 | |
| 62 | void setup(void); |
| 63 | void cleanup(void); |
| 64 | |
robbiew | a728d28 | 2003-09-08 21:36:41 +0000 | [diff] [blame] | 65 | ssize_t safe_read(int fd, void *buf, size_t count) |
| 66 | { |
| 67 | ssize_t n; |
| 68 | |
| 69 | do { |
| 70 | n = read(fd, buf, count); |
| 71 | } while (n < 0 && errno == EINTR); |
| 72 | |
| 73 | return n; |
| 74 | } |
| 75 | |
plars | 74948ad | 2002-11-14 16:16:14 +0000 | [diff] [blame] | 76 | int main(int ac, char **av) |
plars | 865695b | 2001-08-27 22:15:12 +0000 | [diff] [blame] | 77 | { |
| 78 | int lc; /* loop counter */ |
| 79 | char *msg; /* message returned from parse_opts */ |
| 80 | |
plars | 74948ad | 2002-11-14 16:16:14 +0000 | [diff] [blame] | 81 | int i, red, wtstatus; |
plars | 865695b | 2001-08-27 22:15:12 +0000 | [diff] [blame] | 82 | int pipefd[2]; /* fds for pipe read/write */ |
plars | 865695b | 2001-08-27 22:15:12 +0000 | [diff] [blame] | 83 | char rebuf[BUFSIZ]; |
| 84 | int Acnt = 0, Bcnt = 0; /* count 'A' and 'B' */ |
| 85 | int fork_1, fork_2; /* ret values in parent */ |
| 86 | |
| 87 | /* parse standard options */ |
| 88 | if ((msg = parse_opts(ac, av, (option_t *)NULL, NULL)) != (char *)NULL){ |
| 89 | tst_brkm(TBROK, tst_exit, "OPTION PARSING ERROR - %s", msg); |
| 90 | /*NOTREACHED*/ |
| 91 | } |
| 92 | |
| 93 | setup(); |
| 94 | |
| 95 | for (lc = 0; TEST_LOOPING(lc); lc++) { |
| 96 | |
| 97 | /* reset Tst_count in case we are looping */ |
| 98 | Tst_count = 0; |
| 99 | |
| 100 | TEST(pipe(pipefd)); |
| 101 | |
| 102 | if (TEST_RETURN == -1) { |
| 103 | tst_resm(TFAIL, "pipe() call failed"); |
| 104 | continue; |
| 105 | } |
| 106 | |
| 107 | if (!STD_FUNCTIONAL_TEST) { |
| 108 | tst_resm(TWARN, "-f option should not be used"); |
| 109 | tst_resm(TPASS, "call succeeded"); |
| 110 | continue; |
| 111 | } |
| 112 | |
robbiew | d34d581 | 2005-07-11 22:28:09 +0000 | [diff] [blame] | 113 | if ((fork_1 = FORK_OR_VFORK()) == -1) { |
plars | 865695b | 2001-08-27 22:15:12 +0000 | [diff] [blame] | 114 | tst_brkm(TBROK, cleanup, "fork() #1 failed"); |
| 115 | /*NOTREACHED*/ |
| 116 | } |
| 117 | |
| 118 | if (fork_1 == 0) { /* 1st child */ |
| 119 | if (close(pipefd[0]) != 0) { |
| 120 | tst_resm(TWARN, "pipefd[0] close failed, " |
| 121 | "errno = %d", errno); |
| 122 | exit(1); |
| 123 | } |
| 124 | |
| 125 | for (i = 0; i < PIPEWRTCNT / 2; ++i) { |
| 126 | if (write(pipefd[1], "A", 1) != 1) { |
| 127 | tst_resm(TWARN, "write to pipe failed"); |
| 128 | exit(1); |
| 129 | } |
| 130 | } |
| 131 | exit(0); |
| 132 | } |
| 133 | |
| 134 | /* parent */ |
| 135 | |
| 136 | waitpid(fork_1, &wtstatus, 0); |
| 137 | if (WEXITSTATUS(wtstatus) != 0) { |
| 138 | tst_brkm(TBROK, cleanup, "problem detected in child, " |
| 139 | "wait status %d, errno = %d", wtstatus, errno); |
| 140 | } |
| 141 | |
robbiew | d34d581 | 2005-07-11 22:28:09 +0000 | [diff] [blame] | 142 | if ((fork_2 = FORK_OR_VFORK()) == -1) { |
plars | 865695b | 2001-08-27 22:15:12 +0000 | [diff] [blame] | 143 | tst_brkm(TBROK, cleanup, "fork() #2 failed"); |
| 144 | /*NOTREACHED*/ |
| 145 | } |
| 146 | |
| 147 | if (fork_2 == 0) { /* 2nd child */ |
| 148 | if (close(pipefd[0]) != 0) { |
| 149 | tst_resm(TWARN, "pipefd[0] close " |
| 150 | "failed, errno = %d", errno); |
| 151 | exit(1); |
| 152 | } |
| 153 | |
| 154 | for (i = 0; i < PIPEWRTCNT / 2; ++i) { |
| 155 | if (write(pipefd[1], "B", 1) != 1) { |
| 156 | tst_resm(TWARN, "write to pipe failed"); |
| 157 | exit(1); |
| 158 | } |
| 159 | } |
| 160 | exit(0); |
| 161 | } |
| 162 | |
| 163 | /* parent */ |
| 164 | |
| 165 | waitpid(fork_2, &wtstatus, 0); |
| 166 | if (WEXITSTATUS(wtstatus) != 0) { |
| 167 | tst_brkm(TBROK, cleanup, "problem detected in child, " |
| 168 | "wait status %d, errno = %d", wtstatus, errno); |
| 169 | } |
| 170 | |
| 171 | if (close(pipefd[1]) != 0) { |
| 172 | tst_brkm(TBROK, cleanup, "pipefd[1] close failed, " |
| 173 | "errno = %d", errno); |
| 174 | /*NOTREACHED*/ |
| 175 | } |
| 176 | |
robbiew | a728d28 | 2003-09-08 21:36:41 +0000 | [diff] [blame] | 177 | while ((red = safe_read(pipefd[0], rebuf, 100)) > 0) { |
plars | 865695b | 2001-08-27 22:15:12 +0000 | [diff] [blame] | 178 | for (i = 0; i < red; i++) { |
| 179 | if (rebuf[i] == 'A') { |
| 180 | Acnt++; |
| 181 | continue; |
| 182 | } |
| 183 | if (rebuf[i] == 'B') { |
| 184 | Bcnt++; |
| 185 | continue; |
| 186 | } |
| 187 | tst_resm(TFAIL, "got bogus '%c' character", |
| 188 | rebuf[i]); |
| 189 | break; |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | if (red == -1) { |
| 194 | tst_brkm(TBROK, cleanup, "Failure reading pipefd pipe, " |
| 195 | "errno = %d", errno); |
| 196 | } |
| 197 | |
| 198 | if (Bcnt == Acnt && Bcnt == (PIPEWRTCNT / 2)) { |
| 199 | tst_resm(TPASS, "functionality appears to be correct"); |
| 200 | } else { |
| 201 | tst_resm(TFAIL, "functionality is not correct - Acnt " |
| 202 | "= %d, Bcnt = %d", Acnt, Bcnt); |
| 203 | } |
| 204 | |
| 205 | /* clean up things in case we are looping */ |
| 206 | Acnt = Bcnt = 0; |
| 207 | } |
| 208 | cleanup(); |
| 209 | |
| 210 | /*NOTREACHED*/ |
subrata_modak | 43337a3 | 2009-02-26 11:43:51 +0000 | [diff] [blame^] | 211 | return 0; |
plars | 865695b | 2001-08-27 22:15:12 +0000 | [diff] [blame] | 212 | } |
| 213 | |
| 214 | /* |
| 215 | * setup() - performs all ONE TIME setup for this test. |
| 216 | */ |
| 217 | void |
| 218 | setup() |
| 219 | { |
| 220 | /* capture signals */ |
| 221 | tst_sig(FORK, DEF_HANDLER, cleanup); |
| 222 | |
| 223 | /* Pause if that option was specified */ |
| 224 | TEST_PAUSE; |
| 225 | } |
| 226 | |
| 227 | /* |
| 228 | * cleanup() - performs all ONE TIME cleanup for this test at |
| 229 | * completion or premature exit. |
| 230 | */ |
| 231 | void |
| 232 | cleanup() |
| 233 | { |
| 234 | /* |
| 235 | * print timing stats if that option was specified. |
| 236 | * print errno log if that option was specified. |
| 237 | */ |
| 238 | TEST_CLEANUP; |
| 239 | |
| 240 | /* exit with return code appropriate for results */ |
| 241 | tst_exit(); |
| 242 | } |