| /* |
| * |
| * 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 |
| * msgrcv05.c |
| * |
| * DESCRIPTION |
| * msgrcv05 - test for EINTR error |
| * |
| * ALGORITHM |
| * create a message queue with read/write permissions |
| * loop if that option was specified |
| * fork a child who attempts to read a non-existent message with msgrcv() |
| * parent sends a SIGHUP to the child, then waits for the child to complete |
| * check the errno value |
| * issue a PASS message if we get EINTR |
| * otherwise, the tests fails |
| * issue a FAIL message |
| * child exits, parent calls cleanup |
| * |
| * USAGE: <for command-line> |
| * msgrcv05 [-c n] [-e] [-i n] [-I x] [-P x] [-t] |
| * where, -c n : Run n copies concurrently. |
| * -e : Turn on errno logging. |
| * -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 |
| * 03/2001 - Written by Wayne Boyer |
| * 14/03/2008 Matthieu Fertré (Matthieu.Fertre@irisa.fr) |
| * - Fix concurrency issue. Due to the use of usleep function to |
| * synchronize processes, synchronization issues can occur on a loaded |
| * system. Fix this by using pipes to synchronize processes. |
| * |
| * RESTRICTIONS |
| * none |
| */ |
| |
| #include "test.h" |
| |
| #include "ipcmsg.h" |
| #include "libtestsuite.h" |
| |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| |
| void do_child(void); |
| void cleanup(void); |
| void setup(void); |
| #ifdef UCLINUX |
| #define PIPE_NAME "msgrcv05" |
| void do_child_uclinux(void); |
| #endif |
| |
| char *TCID = "msgrcv05"; |
| int TST_TOTAL = 1; |
| |
| int msg_q_1 = -1; /* The message queue id created in setup */ |
| |
| int sync_pipes[2]; |
| |
| MSGBUF rcv_buf; |
| pid_t c_pid; |
| |
| int main(int ac, char **av) |
| { |
| int lc; |
| const char *msg; |
| |
| if ((msg = parse_opts(ac, av, NULL, NULL)) != NULL) |
| tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg); |
| |
| #ifdef UCLINUX |
| maybe_run_child(&do_child_uclinux, "d", &msg_q_1); |
| #endif |
| |
| setup(); /* global setup */ |
| |
| if (sync_pipe_create(sync_pipes, PIPE_NAME) == -1) |
| tst_brkm(TBROK, cleanup, "sync_pipe_create failed"); |
| |
| for (lc = 0; TEST_LOOPING(lc); lc++) { |
| tst_count = 0; |
| |
| /* |
| * fork a child that will attempt to read a non-existent |
| * message from the queue |
| */ |
| if ((c_pid = FORK_OR_VFORK()) == -1) |
| tst_brkm(TBROK, cleanup, "could not fork"); |
| |
| if (c_pid == 0) { |
| /* |
| * Attempt to read a message without IPC_NOWAIT. |
| * With no message to read, the child sleeps. |
| */ |
| |
| #ifdef UCLINUX |
| if (self_exec(av[0], "d", msg_q_1) < 0) |
| tst_brkm(TBROK, cleanup, "could not self_exec"); |
| #else |
| do_child(); |
| #endif |
| } else { |
| |
| if (sync_pipe_wait(sync_pipes) == -1) |
| tst_brkm(TBROK, cleanup, |
| "sync_pipe_wait failed"); |
| |
| if (sync_pipe_close(sync_pipes, PIPE_NAME) == -1) |
| tst_brkm(TBROK, cleanup, |
| "sync_pipe_close failed"); |
| |
| /* After son has been created, give it a chance to execute the |
| * msgrcv command before we continue. Without this sleep, on SMP machine |
| * the father kill could be executed before the son msgrcv. |
| */ |
| sleep(1); |
| |
| /* send a signal that must be caught to the child */ |
| if (kill(c_pid, SIGHUP) == -1) |
| tst_brkm(TBROK, cleanup, "kill failed"); |
| |
| waitpid(c_pid, NULL, 0); |
| } |
| } |
| |
| cleanup(); |
| |
| tst_exit(); |
| } |
| |
| void do_child(void) |
| { |
| if (sync_pipe_notify(sync_pipes) == -1) |
| tst_brkm(TBROK, cleanup, "sync_pipe_notify failed"); |
| |
| if (sync_pipe_close(sync_pipes, PIPE_NAME) == -1) |
| tst_brkm(TBROK, cleanup, "sync_pipe_close failed"); |
| |
| TEST(msgrcv(msg_q_1, &rcv_buf, MSGSIZE, 1, 0)); |
| |
| if (TEST_RETURN != -1) |
| tst_brkm(TFAIL, NULL, "call succeeded unexpectedly"); |
| |
| switch (TEST_ERRNO) { |
| case EINTR: |
| tst_resm(TPASS, "got EINTR as expected"); |
| break; |
| default: |
| tst_resm(TFAIL | TTERRNO, |
| "call failed with an unexpected error"); |
| break; |
| } |
| |
| exit(0); |
| } |
| |
| void sighandler(int sig) |
| { |
| if (sig == SIGHUP) |
| return; |
| else |
| tst_brkm(TBROK, NULL, "unexpected signal %d received", sig); |
| } |
| |
| #ifdef UCLINUX |
| /* |
| * do_child_uclinux() - capture signals again, then run do_child() |
| */ |
| void do_child_uclinux(void) |
| { |
| if (sync_pipe_create(sync_pipes, PIPE_NAME) == -1) |
| tst_brkm(TBROK, cleanup, "sync_pipe_create failed"); |
| |
| tst_sig(FORK, sighandler, cleanup); |
| |
| do_child(); |
| } |
| #endif |
| |
| /* |
| * setup() - performs all the ONE TIME setup for this test. |
| */ |
| void setup(void) |
| { |
| |
| tst_sig(FORK, sighandler, cleanup); |
| |
| TEST_PAUSE; |
| |
| /* |
| * Create a temporary directory and cd into it. |
| * This helps to ensure that a unique msgkey is created. |
| * See ../lib/libipc.c for more information. |
| */ |
| tst_tmpdir(); |
| |
| msgkey = getipckey(); |
| |
| /* create a message queue with read/write permission */ |
| if ((msg_q_1 = msgget(msgkey, IPC_CREAT | IPC_EXCL | MSG_RW)) == -1) |
| tst_brkm(TBROK, cleanup, "Can't create message queue"); |
| } |
| |
| /* |
| * cleanup() - performs all the ONE TIME cleanup for this test at completion |
| * or premature exit. |
| */ |
| void cleanup(void) |
| { |
| /* if it exists, remove the message queue that was created */ |
| rm_queue(msg_q_1); |
| |
| tst_rmdir(); |
| |
| } |