147 lines
3.3 KiB
C
147 lines
3.3 KiB
C
/*
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*
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* Copyright (c) International Business Machines Corp., 2001
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* NAME
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* read03.c
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*
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* DESCRIPTION
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* Testcase to check that read() sets errno to EAGAIN
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*
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* ALGORITHM
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* Create a named pipe (fifo), open it in O_NONBLOCK mode, and
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* attempt to read from it, without writing to it. read() should fail
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* with EAGAIN.
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*
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* USAGE: <for command-line>
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* read03 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
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* where, -c n : Run n copies concurrently.
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* -e : Turn on errno logging.
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* -i n : Execute test n times.
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* -I x : Execute test for x seconds.
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* -P x : Pause for x seconds between iterations.
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* -t : Turn on syscall timing.
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*
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* HISTORY
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* 07/2001 Ported by Wayne Boyer
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*
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* RESTRICTIONS
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* NONE
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*/
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <errno.h>
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#include "test.h"
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char *TCID = "read03";
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int TST_TOTAL = 1;
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char fifo[100] = "fifo";
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int rfd, wfd;
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struct stat buf;
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void alarm_handler();
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void setup();
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void cleanup();
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int main(int ac, char **av)
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{
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int lc;
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int c;
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tst_parse_opts(ac, av, NULL, NULL);
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setup();
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/*
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* The following loop checks looping state if -i option given
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*/
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for (lc = 0; TEST_LOOPING(lc); lc++) {
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/* reset tst_count in case we are looping */
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tst_count = 0;
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TEST(read(rfd, &c, 1));
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if (TEST_RETURN != -1) {
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tst_resm(TFAIL, "read() failed to fail when nothing "
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"is written to a pipe");
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continue;
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}
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if (TEST_ERRNO != EAGAIN) {
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tst_resm(TFAIL, "read set bad errno, expected "
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"EAGAIN, got %d", TEST_ERRNO);
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} else {
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tst_resm(TPASS, "read() succeded in setting errno to "
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"EAGAIN");
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}
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}
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cleanup();
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tst_exit();
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}
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/*
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* setup() - performs all ONE TIME setup for this test
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*/
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void setup(void)
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{
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tst_sig(NOFORK, DEF_HANDLER, cleanup);
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TEST_PAUSE;
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/* create a temporary filename */
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sprintf(fifo, "%s.%d", fifo, getpid());
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/* Create a temporary directory and cd to it */
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tst_tmpdir();
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if (mknod(fifo, S_IFIFO | 0777, 0) < 0) {
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tst_brkm(TBROK, cleanup, "mknod() failed, errno: %d", errno);
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}
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if (stat(fifo, &buf) != 0) {
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tst_brkm(TBROK, cleanup, "stat() failed, errno: %d", errno);
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}
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if ((buf.st_mode & S_IFIFO) == 0) {
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tst_brkm(TBROK, cleanup, "Mode does not indicate fifo file");
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}
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rfd = open(fifo, O_RDONLY | O_NONBLOCK);
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wfd = open(fifo, O_WRONLY | O_NONBLOCK);
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}
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/*
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* cleanup() - performs all ONE TIME cleanup for this test at
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* completion or premature exit.
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*/
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void cleanup(void)
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{
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close(rfd);
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close(wfd);
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unlink(fifo);
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/* delete the test directory created in setup() */
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tst_rmdir();
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}
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