120 lines
2.8 KiB
C
120 lines
2.8 KiB
C
/*
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* Copyright (c) International Business Machines Corp., 2003
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* Test Description:
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* Verify that truncating a mmaped file works correctly.
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*
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* Expected Result:
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* ftruncate should be allowed to increase, decrease, or zero the
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* size of a file that has been mmaped
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*
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* Test:
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* Use ftruncate to shrink the file while it is mapped
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* Use ftruncate to grow the file while it is mapped
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* Use ftruncate to zero the size of the file while it is mapped
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*
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* HISTORY
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* 04/2003 Written by Paul Larson
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include "test.h"
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#define mapsize (1 << 14)
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char *TCID = "mmap09";
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int TST_TOTAL = 3;
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static int fd;
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static char *maddr;
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static struct test_case_t {
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off_t newsize;
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char *desc;
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} TC[] = {
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{mapsize - 8192, "ftruncate mmaped file to a smaller size"},
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{mapsize + 1024, "ftruncate mmaped file to a larger size"},
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{0, "ftruncate mmaped file to 0 size"},
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};
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static void setup(void);
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static void cleanup(void);
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int main(int argc, char **argv)
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{
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int lc;
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int i;
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tst_parse_opts(argc, argv, NULL, NULL);
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setup();
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for (lc = 0; TEST_LOOPING(lc); lc++) {
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tst_count = 0;
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for (i = 0; i < TST_TOTAL; i++) {
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TEST(ftruncate(fd, TC[i].newsize));
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if (TEST_RETURN == -1) {
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tst_resm(TFAIL | TTERRNO, "%s", TC[i].desc);
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} else {
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tst_resm(TPASS, "%s", TC[i].desc);
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}
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}
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}
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cleanup();
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tst_exit();
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}
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static void setup(void)
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{
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tst_sig(NOFORK, DEF_HANDLER, cleanup);
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TEST_PAUSE;
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tst_tmpdir();
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if ((fd = open("mmaptest", O_RDWR | O_CREAT, 0666)) < 0)
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tst_brkm(TFAIL | TERRNO, cleanup, "opening mmaptest failed");
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/* ftruncate the file to 16k */
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if (ftruncate(fd, mapsize) < 0)
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tst_brkm(TFAIL | TERRNO, cleanup, "ftruncate file failed");
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maddr = mmap(0, mapsize, PROT_READ | PROT_WRITE,
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MAP_FILE | MAP_SHARED, fd, 0);
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if (maddr == MAP_FAILED)
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tst_brkm(TFAIL | TERRNO, cleanup, "mmapping mmaptest failed");
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/* fill up the file with A's */
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memset(maddr, 'A', mapsize);
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}
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static void cleanup(void)
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{
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munmap(maddr, mapsize);
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close(fd);
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tst_rmdir();
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}
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