1/* 2 * Copyright (c) 2002, Intel Corporation. All rights reserved. 3 * This file is licensed under the GPL license. For the full content 4 * of this license, see the COPYING file at the top level of this 5 * source tree. 6 7 * 8 * The mmap( ) function shall fail if: 9 * ML [EAGAIN] The mapping could not be locked in memory, 10 * if required by mlockall ( ), due toa lack of resources. 11 * 12 * Test Step: 13 * 1. Call mlockall(), setting MCL_FUTURE; 14 * 2. Call setrlimit(), set rlim_cur of resource RLIMIT_MEMLOCK to a 15 * certain value. 16 * 3. Map a shared memory object, with size larger than the 17 * rlim_cur value set in step 2 18 * 4. Should get EAGAIN. 19 */ 20 21#define _XOPEN_SOURCE 600 22#include <pthread.h> 23#include <stdio.h> 24#include <stdlib.h> 25#include <unistd.h> 26#include <sys/mman.h> 27#include <sys/types.h> 28#include <sys/stat.h> 29#include <sys/resource.h> 30#include <fcntl.h> 31#include <string.h> 32#include <errno.h> 33#include "posixtest.h" 34 35#define TNAME "mmap/18-1.c" 36 37int main() 38{ 39 char tmpfname[256]; 40 int shm_fd; 41 42 /* size of shared memory object */ 43 size_t shm_size; 44 45 void *pa = NULL; 46 void *addr = NULL; 47 size_t len; 48 int prot = PROT_READ | PROT_WRITE; 49 int flag = MAP_SHARED; 50 int fd; 51 off_t off = 0; 52 53 size_t memlock_size; 54 struct rlimit rlim = {.rlim_max = RLIM_INFINITY}; 55 56 /* Lock all memory page to be mapped */ 57 if (mlockall(MCL_FUTURE) == -1) 58 { 59 printf(TNAME " Error at mlockall(): %s\n", strerror(errno)); 60 return PTS_UNRESOLVED; 61 } 62 63 /* Set rlim.rlim_cur < len */ 64 65 len = 1024 * 1024; 66 memlock_size = len / 2; 67 rlim.rlim_cur = memlock_size; 68 69 /* We don't cate the size of the actual shared memory object */ 70 shm_size = 1024; 71 72 if (setrlimit (RLIMIT_MEMLOCK, &rlim) == -1) 73 { 74 printf(TNAME " Error at setrlimit(): %s\n", strerror(errno)); 75 return PTS_UNRESOLVED; 76 } 77 78 snprintf(tmpfname, sizeof(tmpfname), "pts_mmap_18_1_%ld", 79 (long)getpid()); 80 81 /* Create shared object */ 82 shm_unlink(tmpfname); 83 shm_fd = shm_open(tmpfname, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR); 84 if(shm_fd == -1) 85 { 86 printf(TNAME " Error at shm_open(): %s\n", strerror(errno)); 87 return PTS_UNRESOLVED; 88 } 89 shm_unlink(tmpfname); 90 if(ftruncate(shm_fd, shm_size) == -1) { 91 printf(TNAME " Error at ftruncate(): %s\n", strerror(errno)); 92 return PTS_UNRESOLVED; 93 } 94 95 fd = shm_fd; 96 pa = mmap (addr, len, prot, flag, fd, off); 97 if (pa == MAP_FAILED && errno == EAGAIN) 98 { 99 printf ("Test Pass: " TNAME " Get EAGAIN: %s\n", 100 strerror(errno)); 101 close(fd); 102 munmap(pa, len); 103 exit(PTS_PASS); 104 } 105 106 if (pa == MAP_FAILED) 107 perror("Error at mmap()"); 108 close(fd); 109 munmap(pa, len); 110 printf ("Test Fail: Did not get EAGAIN as expected\n"); 111 return PTS_FAIL; 112} 113