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/* Test of lseek() function.
Copyright (C) 2007-2008 Free Software Foundation, Inc.
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 3 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, see <http://www.gnu.org/licenses/>. */
/* Written by Eric Blake, 2007. */
#include <config.h>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#define ASSERT(expr) \
do \
{ \
if (!(expr)) \
{ \
fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
fflush (stderr); \
abort (); \
} \
} \
while (0)
/* ARGC must be 2; *ARGV[1] is '0' if stdin and stdout are files, '1'
if they are pipes, and '2' if they are closed. Check for proper
semantics of lseek. */
int
main (int argc, char **argv)
{
if (argc != 2)
return 2;
switch (*argv[1])
{
case '0': /* regular files */
ASSERT (lseek (0, (off_t)2, SEEK_SET) == 2);
ASSERT (lseek (0, (off_t)-4, SEEK_CUR) == -1);
ASSERT (errno == EINVAL);
errno = 0;
#if ! defined __BEOS__
/* POSIX says that the last lseek call, when failing, does not change
the current offset. But BeOS sets it to 0. */
ASSERT (lseek (0, (off_t)0, SEEK_CUR) == 2);
#endif
#if 0 /* leads to SIGSYS on IRIX 6.5 */
ASSERT (lseek (0, (off_t)0, (SEEK_SET | SEEK_CUR | SEEK_END) + 1) == -1);
ASSERT (errno == EINVAL);
#endif
ASSERT (lseek (1, (off_t)2, SEEK_SET) == 2);
errno = 0;
ASSERT (lseek (1, (off_t)-4, SEEK_CUR) == -1);
ASSERT (errno == EINVAL);
errno = 0;
#if ! defined __BEOS__
/* POSIX says that the last lseek call, when failing, does not change
the current offset. But BeOS sets it to 0. */
ASSERT (lseek (1, (off_t)0, SEEK_CUR) == 2);
#endif
#if 0 /* leads to SIGSYS on IRIX 6.5 */
ASSERT (lseek (1, (off_t)0, (SEEK_SET | SEEK_CUR | SEEK_END) + 1) == -1);
ASSERT (errno == EINVAL);
#endif
break;
case '1': /* pipes */
errno = 0;
ASSERT (lseek (0, (off_t)0, SEEK_CUR) == -1);
ASSERT (errno == ESPIPE);
errno = 0;
ASSERT (lseek (1, (off_t)0, SEEK_CUR) == -1);
ASSERT (errno == ESPIPE);
break;
case '2': /* closed */
/* Explicitly close file descriptors 0 and 1. The <&- and >&- in the
invoking shell are not enough on HP-UX. */
close (0);
close (1);
errno = 0;
ASSERT (lseek (0, (off_t)0, SEEK_CUR) == -1);
ASSERT (errno == EBADF);
errno = 0;
ASSERT (lseek (1, (off_t)0, SEEK_CUR) == -1);
ASSERT (errno == EBADF);
break;
default:
return 1;
}
return 0;
}
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