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111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
/* Test truncating a file.
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Copyright (C) 2017 Free Software Foundation, Inc.
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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 3 of the License, or
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(at your option) any later version.
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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 the
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GNU General Public License for more details.
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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, see <http://www.gnu.org/licenses/>. */
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#include <config.h>
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#include <unistd.h>
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#include "signature.h"
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SIGNATURE_CHECK (truncate, int, (const char *, off_t));
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#include <errno.h>
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#include <fcntl.h>
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#include "ignore-value.h"
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#include "macros.h"
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#define BASE "test-truncate.t"
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int
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main (int argc, char *argv[])
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{
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/* Clean up any trash from prior testsuite runs. */
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ignore_value (system ("rm -rf " BASE "*"));
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{
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int fd = open (BASE "file", O_RDWR | O_TRUNC | O_CREAT, 0600);
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ASSERT (fd >= 0);
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ASSERT (write (fd, "Hello", 5) == 5);
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close (fd);
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}
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{
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int fd = open (BASE "file", O_RDONLY);
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ASSERT (fd >= 0);
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ASSERT (lseek (fd, 0, SEEK_END) == 5);
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close (fd);
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}
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/* Test increasing the size. */
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ASSERT (truncate (BASE "file", 314159) == 0);
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{
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int fd = open (BASE "file", O_RDONLY);
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ASSERT (fd >= 0);
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ASSERT (lseek (fd, 0, SEEK_END) == 314159);
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close (fd);
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}
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/* Test reducing the size. */
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ASSERT (truncate (BASE "file", 3) == 0);
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{
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int fd = open (BASE "file", O_RDONLY);
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ASSERT (fd >= 0);
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ASSERT (lseek (fd, 0, SEEK_END) == 3);
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close (fd);
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}
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/* Test reducing the size to 0. */
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ASSERT (truncate (BASE "file", 0) == 0);
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{
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int fd = open (BASE "file", O_RDONLY);
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ASSERT (fd >= 0);
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ASSERT (lseek (fd, 0, SEEK_END) == 0);
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close (fd);
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}
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/* Test behaviour for nonexistent files. */
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{
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errno = 0;
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ASSERT (truncate ("/nonexistent", 0) == -1);
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ASSERT (errno == ENOENT);
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}
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/* Test behaviour for directories. */
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{
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errno = 0;
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ASSERT (truncate (".", 0) == -1);
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ASSERT (errno == EISDIR
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|| /* on native Windows */ errno == EACCES);
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}
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/* Test behaviour for trailing slashes. */
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{
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errno = 0;
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ASSERT (truncate (BASE "file/", 0) == -1);
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ASSERT (errno == ENOTDIR
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|| /* on native Windows */ errno == EINVAL);
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}
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/* Test behaviour for invalid lengths. */
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{
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errno = 0;
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ASSERT (truncate (BASE "file", -3) == -1);
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ASSERT (errno == EINVAL);
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}
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/* Cleanup. */
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ASSERT (unlink (BASE "file") == 0);
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return 0;
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}
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