197 lines
4.3 KiB
C
197 lines
4.3 KiB
C
/*
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* Copyright (c) Wipro Technologies Ltd, 2002. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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/**********************************************************
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*
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* TEST IDENTIFIER : sched_setparam03
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*
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* EXECUTED BY : root / superuser
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*
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* TEST TITLE : Checks functionality for sched_setparam(2) for pid!=0
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*
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* TEST CASE TOTAL : 1
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*
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* AUTHOR : Saji Kumar.V.R <saji.kumar@wipro.com>
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*
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* SIGNALS
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* Uses SIGUSR1 to pause before test if option set.
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* (See the parse_opts(3) man page).
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*
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* DESCRIPTION
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* This test forks a child & changes its parent's scheduling priority
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*
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* Setup:
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* Setup signal handling.
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* Pause for SIGUSR1 if option specified.
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* Change scheduling policy to SCHED_FIFO
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*
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* Test:
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* Loop if the proper options are given.
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* Fork a child
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*
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* CHILD:
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* Changes scheduling priority for parent
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*
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* PARENT:
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* If scheduling priority is set properly,
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* TEST passed
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* else
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* TEST failed
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*
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* Cleanup:
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* Print errno log and/or timing stats if options given
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*
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* USAGE: <for command-line>
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* sched_setparam03 [-c n] [-e] [-i n] [-I x] [-P x] [-t] [-h] [-f] [-p]
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* where, -c n : Run n copies concurrently.
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* -e : Turn on errno logging.
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* -h : Show help screen
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* -f : Turn off functional testing
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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 : Pause for SIGUSR1 before starting
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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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****************************************************************/
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#include <err.h>
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#include <errno.h>
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#include <sched.h>
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#include <sys/wait.h>
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#include "test.h"
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#define NEW_PRIORITY 5
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static void setup();
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static void cleanup();
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static int verify_priority();
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char *TCID = "sched_setparam03";
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int TST_TOTAL = 1;
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static struct sched_param param = { NEW_PRIORITY };
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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 status;
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pid_t child_pid;
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tst_parse_opts(ac, av, NULL, NULL);
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setup();
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for (lc = 0; TEST_LOOPING(lc); lc++) {
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tst_count = 0;
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switch (child_pid = FORK_OR_VFORK()) {
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case -1:
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/* fork() failed */
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tst_resm(TFAIL, "fork() failed");
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continue;
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case 0:
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/* Child */
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/*
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* Call sched_setparam(2) with pid = getppid() so that
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* it will set the scheduling parameters for parent
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* process
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*/
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TEST(sched_setparam(getppid(), ¶m));
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if (TEST_RETURN == -1) {
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err(0, "sched_setparam returned %ld",
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TEST_RETURN);
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}
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exit(1);
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default:
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/* Parent */
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if ((waitpid(child_pid, &status, 0)) < 0) {
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tst_resm(TFAIL, "wait() failed");
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continue;
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}
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/*
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* Verify that parent's scheduling priority has
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* changed.
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*/
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if ((WIFEXITED(status)) && (WEXITSTATUS(status)) &&
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(verify_priority())) {
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tst_resm(TPASS, "Test Passed");
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} else {
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tst_resm(TFAIL, "Test Failed");
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}
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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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/* setup() - performs all ONE TIME setup for this test */
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void setup(void)
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{
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struct sched_param p = { 1 };
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tst_require_root();
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tst_sig(FORK, DEF_HANDLER, cleanup);
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TEST_PAUSE;
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/* Change scheduling policy to SCHED_FIFO */
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if ((sched_setscheduler(0, SCHED_FIFO, &p)) == -1) {
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tst_brkm(TBROK, cleanup, "sched_setscheduler() failed");
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}
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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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}
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/*
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* verify_priority() - This function checks whether the priority is
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* set correctly
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*/
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int verify_priority(void)
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{
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struct sched_param p;
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if ((sched_getparam(0, &p)) == 0) {
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if (p.sched_priority == NEW_PRIORITY) {
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return 1;
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} else {
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tst_resm(TWARN, "sched_getparam() returned priority"
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" value as %d", p.sched_priority);
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return 0;
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}
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}
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tst_resm(TWARN, "sched_getparam() failed");
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return 0;
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}
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