1 /* 2 * 3 * Copyright (c) International Business Machines Corp., 2001 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 13 * the GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 18 */ 19 20 /* 21 * Test Name: mremap04 22 * 23 * Test Description: 24 * Verify that, 25 * mremap() fails when used to expand the existing virtual memory mapped 26 * region to the requested size, if the memory area cannot be expanded at 27 * the current virtual address and MREMAP_MAYMOVE flag not set. 28 * 29 * Expected Result: 30 * mremap() should return -1 and set errno to ENOMEM. 31 * 32 * Algorithm: 33 * Setup: 34 * Setup signal handling. 35 * Create temporary directory. 36 * Pause for SIGUSR1 if option specified. 37 * 38 * Test: 39 * Loop if the proper options are given. 40 * Execute system call 41 * Check return code, if system call failed (return=-1) 42 * if errno set == expected errno 43 * Issue sys call failed with expected return value and errno. 44 * Otherwise, 45 * Issue sys call failed with unexpected errno. 46 * Otherwise, 47 * Issue sys call returns unexpected value. 48 * 49 * Cleanup: 50 * Print errno log and/or timing stats if options given 51 * Delete the temporary directory(s)/file(s) created. 52 * 53 * Usage: <for command-line> 54 * mremap04 [-c n] [-e] [-i n] [-I x] [-P x] [-t] 55 * where, -c n : Run n copies concurrently. 56 * -e : Turn on errno logging. 57 * -i n : Execute test n times. 58 * -I x : Execute test for x seconds. 59 * -p x : Pause for x seconds between iterations. 60 * -t : Turn on syscall timing. 61 * 62 * HISTORY 63 * 07/2001 Ported by Wayne Boyer 64 * 65 * 11/09/2001 Manoj Iyer (manjo (at) austin.ibm.com) 66 * Modified. 67 * - #include <linux/mman.h> should not be included as per man page for 68 * mremap, #include <sys/mman.h> alone should do the job. But inorder 69 * to include definition of MREMAP_MAYMOVE defined in bits/mman.h 70 * (included by sys/mman.h) __USE_GNU needs to be defined. 71 * There may be a more elegant way of doing this... 72 * 73 * 26/02/2008 Renaud Lottiaux (Renaud.Lottiaux (at) kerlabs.com) 74 * - Fix concurrency issue. Use a shm key from getipckey instead of 75 * a fixed hard-coded value. 76 * 77 * RESTRICTIONS: 78 * None. 79 */ 80 #include <errno.h> 81 #include <unistd.h> 82 #define __USE_GNU 83 #include <sys/mman.h> 84 #undef __USE_GNU 85 #include <sys/ipc.h> 86 #include <sys/shm.h> 87 88 #include "test.h" 89 90 #define SHM_MODE (SHM_R | SHM_W) /* mode permissions of shared memory */ 91 92 char *TCID = "mremap04"; 93 int TST_TOTAL = 1; 94 char *addr; /* addr of memory mapped region */ 95 char *shmaddr; /* pointer to shared memory segment */ 96 int shmid; /* shared memory identifier. */ 97 int memsize; /* memory mapped size */ 98 int newsize; /* new size of virtual memory block */ 99 100 void setup(); /* Main setup function of test */ 101 void cleanup(); /* cleanup function for the test */ 102 103 extern int getipckey(); 104 105 int main(int ac, char **av) 106 { 107 int lc; 108 109 tst_parse_opts(ac, av, NULL, NULL); 110 111 setup(); 112 113 for (lc = 0; TEST_LOOPING(lc); lc++) { 114 115 tst_count = 0; 116 117 /* 118 * Attempt to expand the existing shared 119 * memory region of newsize by newsize limits 120 * using mremap() should fail as specified 121 * memory area already locked and MREMAP_MAYMOVE 122 * flag unset. 123 */ 124 errno = 0; 125 addr = mremap(shmaddr, memsize, newsize, 0); 126 TEST_ERRNO = errno; 127 128 /* Check for the return value of mremap() */ 129 if (addr != MAP_FAILED) { 130 tst_resm(TFAIL, 131 "mremap returned invalid value, expected: -1"); 132 133 /* Unmap the mapped memory region */ 134 if (munmap(addr, newsize) != 0) { 135 tst_brkm(TFAIL, cleanup, "munmap failed to " 136 "unmap the expanded memory region, " 137 "error=%d", errno); 138 } 139 continue; 140 } 141 142 if (TEST_ERRNO == ENOMEM) { 143 tst_resm(TPASS, "mremap() failed, " 144 "'MREMAP_MAYMOVE flag unset', " 145 "errno %d", TEST_ERRNO); 146 } else { 147 tst_resm(TFAIL, "mremap() failed, " 148 "Unexpected errno %d", TEST_ERRNO); 149 } 150 } 151 152 cleanup(); 153 tst_exit(); 154 155 } 156 157 /* 158 * setup() - performs all ONE TIME setup for this test. 159 * 160 * Get system page size, Set the size of virtual memory area and the 161 * newsize after resize, 162 * Create a named shared memory segment SHMKEY of newsize and mode SHM_MODE 163 * by using shmget() which returns a shared memory identifier associated 164 * with the created shared memory segment. 165 * Call shmat() to attach the shared memory segment to the data segment of the 166 * calling process. The segment is attached at the first available address as 167 * selected by the system. 168 */ 169 void setup(void) 170 { 171 key_t shmkey; 172 173 tst_sig(FORK, DEF_HANDLER, cleanup); 174 175 TEST_PAUSE; 176 177 tst_tmpdir(); 178 179 /* Get the system page size */ 180 if ((memsize = getpagesize()) < 0) { 181 tst_brkm(TBROK, NULL, 182 "getpagesize() failed to get system page size"); 183 } 184 185 /* Get the New size of virtual memory block after resize */ 186 newsize = (memsize * 2); 187 188 /* get an IPC resource key */ 189 shmkey = getipckey(); 190 191 /* 192 * Create a shared memory segment represented by SHMKEY of 193 * specified size 'newsize' and mode permissions 'SHM_MODE'. 194 */ 195 shmid = shmget(shmkey, newsize, IPC_CREAT | SHM_MODE); 196 if (shmid == -1) { 197 tst_brkm(TBROK, NULL, "shmget() Failed to create a shared " 198 "memory, error:%d", errno); 199 } 200 201 /* 202 * Attach the shared memory segment associated with the shared 203 * memory identifier specified by "shmid" to the data segment of 204 * the calling process at the first available address as selected 205 * by the system. 206 */ 207 shmaddr = shmat(shmid, NULL, 0); 208 if (shmaddr == (void *)-1) { 209 tst_brkm(TBROK, cleanup, "shmat() Failed to attach shared " 210 "memory, error:%d", errno); 211 } 212 } 213 214 /* 215 * cleanup() - performs all ONE TIME cleanup for this test at 216 * completion or premature exit. 217 * Detach the shared memory segment and remove the shared memory 218 * identifier associated with the shared memory. 219 */ 220 void cleanup(void) 221 { 222 223 /* 224 * Detach the shared memory segment attached to 225 * the calling process's data segment 226 */ 227 if (shmdt(shmaddr) < 0) { 228 tst_brkm(TFAIL, NULL, "shmdt() Failed to detach shared " 229 "memory, error:%d", errno); 230 } 231 232 /* 233 * Remove the shared memory identifier associated with 234 * the shared memory segment and destroy the shared memory 235 * segment. 236 */ 237 if (shmctl(shmid, IPC_RMID, 0) < 0) { 238 tst_brkm(TFAIL, NULL, "shmctl() Failed to remove shared " 239 "memory, error:%d", errno); 240 } 241 242 tst_rmdir(); 243 244 /* Exit the program */ 245 246 } 247
