1 /* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License version 2. 4 * 5 * This program is distributed in the hope that it will be useful, 6 * but WITHOUT ANY WARRANTY; without even the implied warranty of 7 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 8 * GNU General Public License for more details. 9 * 10 * Test that mlockall lock the mapped files pages currently mapped into the 11 * address space of the process when MCL_CURRENT is set. 12 * 13 * This test use msync to check that the page is locked. 14 */ 15 #include <sys/mman.h> 16 #include <stdio.h> 17 #include <unistd.h> 18 #include <errno.h> 19 #include <fcntl.h> 20 #include <stdlib.h> 21 #include "posixtest.h" 22 23 int main(void) 24 { 25 void *page_ptr; 26 size_t page_size; 27 int result, fd; 28 void *foo; 29 char filename[] = "/tmp/mlockall_3-7-XXXXXX"; 30 31 page_size = sysconf(_SC_PAGESIZE); 32 if (errno) { 33 perror("An error occurs when calling sysconf()"); 34 return PTS_UNRESOLVED; 35 } 36 37 fd = mkstemp(filename); 38 if (fd == -1) { 39 perror("An error occurs when calling open()"); 40 return PTS_UNRESOLVED; 41 } 42 unlink(filename); 43 44 foo = mmap(NULL, page_size, PROT_READ, MAP_SHARED, fd, 0); 45 if (foo == MAP_FAILED) { 46 perror("An error occurs when calling mmap()"); 47 return PTS_UNRESOLVED; 48 } 49 50 if (mlockall(MCL_CURRENT) == -1) { 51 if (errno == EPERM) { 52 printf 53 ("You don't have permission to lock your address space.\nTry to rerun this test as root.\n"); 54 } else { 55 perror("An error occurs when calling mlockall()"); 56 } 57 return PTS_UNRESOLVED; 58 } 59 60 page_ptr = (void *)((long)foo - ((long)foo % page_size)); 61 62 result = msync(page_ptr, page_size, MS_SYNC | MS_INVALIDATE); 63 if (result == -1 && errno == EBUSY) { 64 printf("Test PASSED\n"); 65 return PTS_PASS; 66 } else if (result == 0) { 67 printf 68 ("The mapped files pages of the process are not locked.\n"); 69 return PTS_FAIL; 70 } 71 perror("Unexpected error"); 72 return PTS_UNRESOLVED; 73 } 74
