/* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2. * * 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. * * Test that the removal of the memory object contents is postponed until all * open and map references to the shared memory object have been removed. */ /* ftruncate was formerly an XOPEN extension. We define _XOPEN_SOURCE here to avoid warning if the implementation does not program ftruncate as a base interface */ #define _XOPEN_SOURCE 600 #include #include #include #include #include #include #include #include "posixtest.h" #define BUF_SIZE 8 #define SHM_NAME "posixtest_3-1" int main() { int fd; char *buf; fd = shm_open(SHM_NAME, O_RDWR|O_CREAT, S_IRUSR|S_IWUSR); if(fd == -1) { perror("An error occurs when calling shm_open()"); return PTS_UNRESOLVED; } if(ftruncate(fd, BUF_SIZE) != 0) { perror("An error occurs when calling ftruncate()"); shm_unlink(SHM_NAME); return PTS_UNRESOLVED; } if(shm_unlink(SHM_NAME) != 0) { perror("An error occurs when calling shm_unlink()"); return PTS_UNRESOLVED; } /* Now, SHM_NAME is unlinked but there are open references on it */ buf = mmap(NULL, BUF_SIZE, PROT_READ, MAP_SHARED, fd, 0); if( buf == MAP_FAILED && errno == EBADF) { printf("The shared memory object was removed.\n"); return PTS_FAIL; } else if(buf == MAP_FAILED) { perror("An error occurs when calling mmap()"); return PTS_UNRESOLVED; } printf("Test PASSED\n"); return PTS_PASS; }