1 /* 2 * Copyright (c) 2002, Intel Corporation. All rights reserved. 3 * Copyright (c) 2012, Cyril Hrubis <chrubis (at) suse.cz> 4 * 5 * This file is licensed under the GPL license. For the full content 6 * of this license, see the COPYING file at the top level of this 7 * source tree. 8 * 9 * Implementation performs mapping operations over whole pages. 10 * Thus, while the argument len 11 * need not meet a size or alignment constraint, 12 * the implementation shall include, in any mapping 13 * operation, any partial page specified by the range [pa,pa+len). 14 * The system shall always zero-fill any partial page at the end of an object. 15 * Further, the system shall never write out any modified portions of 16 * the last page of an object which are beyond its end. 17 * 18 * Test Steps: 19 * 1. Create a process, in this process: 20 * a. map a shared memory object with size of 1/2 * page_size, 21 * set len = 1/2 * page_size 22 * b. Read the partial page beyond the object size. 23 * Make sure the partial page is zero-filled; 24 * c. Modify a byte in the partial page, then un-map the and close the 25 * file descriptor. 26 * 2. Wait for the child proces to exit, then read the file using read() 27 * and check that change wasn't written. 28 */ 29 30 #define _XOPEN_SOURCE 600 31 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <unistd.h> 35 #include <sys/mman.h> 36 #include <sys/types.h> 37 #include <sys/stat.h> 38 #include <sys/wait.h> 39 #include <fcntl.h> 40 #include <string.h> 41 #include <errno.h> 42 #include "posixtest.h" 43 44 int main(void) 45 { 46 char tmpfname[256]; 47 long page_size; 48 49 char *pa, ch; 50 ssize_t len; 51 int fd; 52 53 pid_t child; 54 int i, exit_val, ret, size; 55 56 page_size = sysconf(_SC_PAGE_SIZE); 57 58 /* mmap will create a partial page */ 59 len = page_size / 2; 60 61 snprintf(tmpfname, sizeof(tmpfname), "pts_mmap_11_5_%d", getpid()); 62 child = fork(); 63 switch (child) { 64 case 0: 65 /* Create shared object */ 66 shm_unlink(tmpfname); 67 fd = shm_open(tmpfname, O_RDWR | O_CREAT | O_EXCL, 68 S_IRUSR | S_IWUSR); 69 if (fd == -1) { 70 printf("Error at shm_open(): %s\n", strerror(errno)); 71 return PTS_UNRESOLVED; 72 } 73 if (ftruncate(fd, len) == -1) { 74 printf("Error at ftruncate(): %s\n", strerror(errno)); 75 return PTS_UNRESOLVED; 76 } 77 78 pa = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); 79 if (pa == MAP_FAILED) { 80 printf("Error at mmap(): %s\n", strerror(errno)); 81 return PTS_FAIL; 82 } 83 84 /* Check the patial page is ZERO filled */ 85 for (i = len; i < page_size; i++) 86 if (pa[i] != 0) { 87 printf("Test FAILED: The partial page at the " 88 "end of an object is not zero-filled\n"); 89 return PTS_FAIL; 90 } 91 92 /* Write the partial page */ 93 pa[len + 1] = 'b'; 94 munmap(pa, len); 95 close(fd); 96 return PTS_PASS; 97 case -1: 98 printf("Error at fork(): %s\n", strerror(errno)); 99 return PTS_UNRESOLVED; 100 default: 101 break; 102 } 103 104 wait(&exit_val); 105 if (!(WIFEXITED(exit_val) && (WEXITSTATUS(exit_val) == PTS_PASS))) { 106 unlink(tmpfname); 107 108 if (WIFEXITED(exit_val)) 109 return WEXITSTATUS(exit_val); 110 111 printf("Child exited abnormally\n"); 112 return PTS_UNRESOLVED; 113 } 114 115 fd = shm_open(tmpfname, O_RDWR, 0); 116 shm_unlink(tmpfname); 117 118 size = 0; 119 120 while ((ret = read(fd, &ch, 1)) == 1) { 121 122 if (ch != 0) { 123 printf("File is not zeroed\n"); 124 return PTS_FAIL; 125 } 126 127 size += ret; 128 } 129 130 if (ret == -1) { 131 printf("Error at read(): %s\n", strerror(errno)); 132 return PTS_UNRESOLVED; 133 } 134 135 if (size != len) { 136 printf("File has wrong size\n"); 137 return PTS_UNRESOLVED; 138 } 139 140 close(fd); 141 142 printf("Test PASSED\n"); 143 return PTS_PASS; 144 } 145
