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103 lines
2.4 KiB
C
103 lines
2.4 KiB
C
/* Test the pread function.
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Copyright (C) 2009-2017 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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/* Written by Jim Meyering. */
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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 (pread, ssize_t, (int, void *, size_t, off_t));
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#include <sys/types.h>
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#include <fcntl.h>
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#include <errno.h>
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#include "macros.h"
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#define N (sizeof buf - 1)
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int
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main (void)
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{
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char const *file = "in";
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int fd;
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char buf[] = "0123456789";
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off_t pos;
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ASSERT (file);
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fd = open (file, O_CREAT | O_WRONLY, 0600);
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ASSERT (0 <= fd);
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ASSERT (write (fd, buf, N) == N);
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ASSERT (close (fd) == 0);
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fd = open (file, O_RDONLY);
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ASSERT (0 <= fd);
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for (pos = 0; pos < 3; pos++)
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{
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size_t i;
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off_t init_pos = lseek (fd, pos, SEEK_SET);
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ASSERT (init_pos == pos);
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for (i = 0; i < N; i++)
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{
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char byte_buf;
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ASSERT (pread (fd, &byte_buf, 1, i) == 1);
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ASSERT (byte_buf == buf[i]);
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ASSERT (lseek (fd, 0, SEEK_CUR) == init_pos);
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}
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}
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{
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/* Invalid offset must evoke failure with EINVAL. */
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char byte;
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ASSERT (pread (fd, &byte, 1, (off_t) -1) == -1);
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ASSERT (errno == EINVAL
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|| errno == EFBIG /* seen on OpenBSD 4.9 */
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);
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}
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ASSERT (close (fd) == 0);
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{
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char byte;
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/* Trying to operate on a pipe must evoke failure with ESPIPE.
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This assumes that stdin is a pipe, and hence not seekable. */
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ASSERT (pread (STDIN_FILENO, &byte, 1, 1) == -1);
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ASSERT (errno == ESPIPE);
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}
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/* Test behaviour for invalid file descriptors. */
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{
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char byte;
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errno = 0;
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ASSERT (pread (-1, &byte, 1, 0) == -1);
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ASSERT (errno == EBADF);
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}
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{
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char byte;
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close (99);
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errno = 0;
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ASSERT (pread (99, &byte, 1, 0) == -1);
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ASSERT (errno == EBADF);
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}
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return 0;
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}
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