| /* |
| * Copyright (c) 2005, Bull S.A.. All rights reserved. |
| * Created by: Sebastien Decugis |
| |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of version 2 of the GNU General Public License as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it would be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| |
| * This sample test aims to check the following assertion: |
| * |
| * If pshared is non-zero, any process that can access the semaphore can use it. |
| |
| * The steps are: |
| * -> Create a shared memory segment and mmap it. |
| * -> sem_init a semaphore placed in this segment, with pshared != 0 and val=0 |
| * -> fork. |
| * -> child process post the semaphore then exit |
| * -> parent process waits for the semaphore. |
| |
| * The test fails if it hangs |
| |
| */ |
| |
| /* We are testing conformance to IEEE Std 1003.1, 2003 Edition */ |
| #define _POSIX_C_SOURCE 200112L |
| |
| /******************************************************************************/ |
| /*************************** standard includes ********************************/ |
| /******************************************************************************/ |
| #include <pthread.h> |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include <semaphore.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <sys/wait.h> |
| #include <sys/mman.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| |
| /******************************************************************************/ |
| /*************************** Test framework *******************************/ |
| /******************************************************************************/ |
| #include "../testfrmw/testfrmw.h" |
| #include "../testfrmw/testfrmw.c" |
| /* This header is responsible for defining the following macros: |
| * UNRESOLVED(ret, descr); |
| * where descr is a description of the error and ret is an int |
| * (error code for example) |
| * FAILED(descr); |
| * where descr is a short text saying why the test has failed. |
| * PASSED(); |
| * No parameter. |
| * |
| * Both three macros shall terminate the calling process. |
| * The testcase shall not terminate in any other maneer. |
| * |
| * The other file defines the functions |
| * void output_init() |
| * void output(char * string, ...) |
| * |
| * Those may be used to output information. |
| */ |
| |
| /******************************************************************************/ |
| /**************************** Configuration ***********************************/ |
| /******************************************************************************/ |
| #ifndef VERBOSE |
| #define VERBOSE 1 |
| #endif |
| |
| /******************************************************************************/ |
| /*************************** Test case ***********************************/ |
| /******************************************************************************/ |
| |
| /* The main test function. */ |
| int main(void) |
| { |
| int ret, status; |
| pid_t child, ctl; |
| int fd; |
| void *buf; |
| sem_t *sem; |
| |
| /* Initialize output */ |
| output_init(); |
| |
| /* Create the shared memory segment */ |
| fd = shm_open("/sem_init_3-2", O_CREAT | O_RDWR, S_IRUSR | S_IWUSR); |
| |
| if (fd == -1) { |
| UNRESOLVED(errno, "Failed to open shared memory segment"); |
| } |
| |
| /* Size the memory segment to 1 page size. */ |
| ret = ftruncate(fd, sysconf(_SC_PAGESIZE)); |
| |
| if (ret != 0) { |
| UNRESOLVED(errno, "Failed to size the shared memory segment"); |
| } |
| |
| /* Map these sengments in the process memory space */ |
| buf = |
| mmap(NULL, sysconf(_SC_PAGESIZE), PROT_READ | PROT_WRITE, |
| MAP_SHARED, fd, 0); |
| |
| if (buf == MAP_FAILED) { |
| UNRESOLVED(errno, "Failed to mmap the shared memory segment"); |
| } |
| |
| sem = (sem_t *) buf; |
| |
| /* Initialize the semaphore */ |
| ret = sem_init(sem, 1, 0); |
| |
| if (ret != 0) { |
| UNRESOLVED(errno, "Failed to init the semaphore"); |
| } |
| |
| /* Create the child */ |
| child = fork(); |
| |
| if (child == -1) { |
| UNRESOLVED(errno, "Failed to fork"); |
| } |
| |
| /* child */ |
| if (child == 0) { |
| /* Post the sempahore */ |
| ret = sem_post(sem); |
| |
| if (ret != 0) { |
| UNRESOLVED(errno, "Failed to post the semaphore"); |
| } |
| |
| /* We're done */ |
| exit(PTS_PASS); |
| } |
| |
| /* Wait the sempahore */ |
| do { |
| ret = sem_wait(sem); |
| } while (ret != 0 && errno == EINTR); |
| |
| if (ret != 0) { |
| UNRESOLVED(errno, "Failed to wait for the semaphore"); |
| } |
| |
| /* Parent joins the child */ |
| ctl = waitpid(child, &status, 0); |
| |
| if (ctl != child) { |
| UNRESOLVED(errno, "Waitpid returned the wrong PID"); |
| } |
| |
| if (!WIFEXITED(status) || (WEXITSTATUS(status) != PTS_PASS)) { |
| FAILED("Child exited abnormally"); |
| } |
| |
| /* Clean things */ |
| ret = sem_destroy(sem); |
| |
| if (ret != 0) { |
| UNRESOLVED(errno, "Failed to destroy the semaphore"); |
| } |
| |
| ret = shm_unlink("/sem_init_3-2"); |
| |
| if (ret != 0) { |
| UNRESOLVED(errno, "Failed to unlink shared memory"); |
| } |
| |
| /* Test passed */ |
| #if VERBOSE > 0 |
| |
| output("Test passed\n"); |
| |
| #endif |
| |
| PASSED; |
| } |