| /* |
| * |
| * Copyright (c) International Business Machines Corp., 2001 |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| * the GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /* |
| * NAME |
| * pipe10.c |
| * |
| * DESCRIPTION |
| * Check that parent can open a pipe and have a child read from it |
| * |
| * ALGORITHM |
| * Parent opens pipe, child reads. Passes if child can read all the |
| * characters written by the parent. |
| * |
| * USAGE: <for command-line> |
| * pipe10 [-c n] [-f] [-i n] [-I x] [-P x] [-t] |
| * where, -c n : Run n copies concurrently. |
| * -f : Turn off functionality Testing. |
| * -i n : Execute test n times. |
| * -I x : Execute test for x seconds. |
| * -P x : Pause for x seconds between iterations. |
| * -t : Turn on syscall timing. |
| * |
| * HISTORY |
| * 07/2001 Ported by Wayne Boyer |
| * |
| * RESTRICTIONS |
| * None |
| */ |
| #include <errno.h> |
| #include <unistd.h> |
| #include <wait.h> |
| #include <string.h> |
| #include "test.h" |
| |
| char *TCID = "pipe10"; |
| int TST_TOTAL = 1; |
| |
| void setup(void); |
| void cleanup(void); |
| |
| ssize_t safe_read(int fd, void *buf, size_t count) |
| { |
| ssize_t n; |
| |
| do { |
| n = read(fd, buf, count); |
| } while (n < 0 && errno == EINTR); |
| |
| return n; |
| } |
| |
| int main(int ac, char **av) |
| { |
| int lc; |
| const char *msg; |
| |
| int fd[2]; /* fds for pipe read/write */ |
| char wrbuf[BUFSIZ], rebuf[BUFSIZ]; |
| int red, written; /* no of chars read and */ |
| /* written to pipe */ |
| int length, greater, forkstat; |
| int retval = 0, status, e_code; |
| |
| if ((msg = parse_opts(ac, av, NULL, NULL)) != NULL) |
| tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg); |
| |
| setup(); |
| |
| for (lc = 0; TEST_LOOPING(lc); lc++) { |
| |
| /* reset tst_count in case we are looping */ |
| tst_count = 0; |
| |
| TEST(pipe(fd)); |
| |
| if (TEST_RETURN == -1) { |
| retval = 1; |
| tst_resm(TFAIL, "pipe creation failed"); |
| continue; |
| } |
| |
| strcpy(wrbuf, "abcdefghijklmnopqrstuvwxyz"); |
| length = strlen(wrbuf) + 1; |
| |
| written = write(fd[1], wrbuf, length); |
| |
| /* did write write at least some chars */ |
| if ((written < 0) || (written > length)) { |
| tst_brkm(TBROK, cleanup, "write to pipe failed"); |
| } |
| |
| forkstat = FORK_OR_VFORK(); |
| |
| if (forkstat == -1) { |
| tst_brkm(TBROK, cleanup, "fork() failed"); |
| } |
| |
| if (forkstat == 0) { /* child */ |
| red = safe_read(fd[0], rebuf, written); |
| |
| /* did read , get at least some chars */ |
| if ((red < 0) || (red > written)) { |
| tst_brkm(TBROK, cleanup, "read pipe failed"); |
| } |
| |
| greater = strcmp(rebuf, wrbuf); |
| |
| /* are the strings written and read equal */ |
| if (greater == 0) { |
| tst_resm(TPASS, "functionality is correct"); |
| } else { |
| retval = 1; |
| tst_resm(TFAIL, "read & write strings do " |
| "not match"); |
| } |
| exit(retval); |
| } else { /* parent */ |
| /* wait for the child to finish */ |
| wait(&status); |
| /* make sure the child returned a good exit status */ |
| e_code = status >> 8; |
| if (e_code != 0) { |
| tst_resm(TFAIL, "Failures reported above"); |
| } |
| } |
| } |
| cleanup(); |
| |
| tst_exit(); |
| } |
| |
| /* |
| * setup() - performs all ONE TIME setup for this test. |
| */ |
| void setup(void) |
| { |
| |
| tst_sig(FORK, DEF_HANDLER, cleanup); |
| |
| TEST_PAUSE; |
| } |
| |
| /* |
| * cleanup() - performs all ONE TIME cleanup for this test at |
| * completion or premature exit. |
| */ |
| void cleanup(void) |
| { |
| } |