| /* |
| * Copyright (c) International Business Machines Corp., 2003 |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * 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. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /* |
| * Test Description: |
| * Verify that truncating a mmaped file works correctly. |
| * |
| * Expected Result: |
| * ftruncate should be allowed to increase, decrease, or zero the |
| * size of a file that has been mmaped |
| * |
| * Test: |
| * Use ftruncate to shrink the file while it is mapped |
| * Use ftruncate to grow the file while it is mapped |
| * Use ftruncate to zero the size of the file while it is mapped |
| * |
| * HISTORY |
| * 04/2003 Written by Paul Larson |
| */ |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <errno.h> |
| #include <sys/mman.h> |
| #include <sys/types.h> |
| #include "test.h" |
| #include "usctest.h" |
| |
| #define mapsize (1 << 14) |
| |
| char *TCID = "mmap09"; |
| int TST_TOTAL = 3; |
| |
| static int fd; |
| static char *maddr; |
| |
| static struct test_case_t { |
| off_t newsize; |
| char *desc; |
| } TC[] = { |
| {mapsize - 8192, "ftruncate mmaped file to a smaller size"}, |
| {mapsize + 1024, "ftruncate mmaped file to a larger size"}, |
| {0, "ftruncate mmaped file to 0 size"}, |
| }; |
| |
| static void setup(void); |
| static void cleanup(void); |
| |
| int main(int argc, char **argv) |
| { |
| int lc; |
| int i; |
| char *msg; |
| |
| if ((msg = parse_opts(argc, argv, NULL, NULL)) != NULL) |
| tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg); |
| |
| setup(); |
| |
| for (lc = 0; TEST_LOOPING(lc); lc++) { |
| tst_count = 0; |
| for (i = 0; i < TST_TOTAL; i++) { |
| TEST(ftruncate(fd, TC[i].newsize)); |
| |
| if (TEST_RETURN == -1) { |
| TEST_ERROR_LOG(TEST_ERRNO); |
| tst_resm(TFAIL | TTERRNO, "%s", TC[i].desc); |
| } else { |
| tst_resm(TPASS, "%s", TC[i].desc); |
| } |
| } |
| |
| } |
| |
| cleanup(); |
| tst_exit(); |
| } |
| |
| static void setup(void) |
| { |
| tst_sig(NOFORK, DEF_HANDLER, cleanup); |
| |
| TEST_PAUSE; |
| |
| tst_tmpdir(); |
| |
| if ((fd = open("mmaptest", O_RDWR | O_CREAT, 0666)) < 0) |
| tst_brkm(TFAIL | TERRNO, cleanup, "opening mmaptest failed"); |
| |
| /* ftruncate the file to 16k */ |
| if (ftruncate(fd, mapsize) < 0) |
| tst_brkm(TFAIL | TERRNO, cleanup, "ftruncate file failed"); |
| |
| maddr = mmap(0, mapsize, PROT_READ | PROT_WRITE, |
| MAP_FILE | MAP_SHARED, fd, 0); |
| if (maddr == MAP_FAILED) |
| tst_brkm(TFAIL | TERRNO, cleanup, "mmapping mmaptest failed"); |
| |
| /* fill up the file with A's */ |
| memset(maddr, 'A', mapsize); |
| } |
| |
| static void cleanup(void) |
| { |
| TEST_CLEANUP; |
| munmap(maddr, mapsize); |
| close(fd); |
| tst_rmdir(); |
| } |