tests/test-lseek.c

   1 /* Test of lseek() function.
   2    Copyright (C) 2007-2024 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Eric Blake, 2007.  */
  18
  19 #include <config.h>
  20
  21 #include <unistd.h>
  22
  23 #include "signature.h"
  24 SIGNATURE_CHECK (lseek, off_t, (int, off_t, int));
  25
  26 #include <errno.h>
  27
  28 #include "macros.h"
  29
  30 /* ARGC must be 2; *ARGV[1] is '0' if stdin and stdout are files, '1'
  31    if they are pipes, and '2' if they are closed.  Check for proper
  32    semantics of lseek.  */
  33 int
  34 main (int argc, char **argv)
  35 {
  36   if (argc != 2)
  37     return 2;
  38   switch (*argv[1])
  39     {
  40     case '0': /* regular files */
  41       ASSERT (lseek (0, (off_t)2, SEEK_SET) == 2);
  42       ASSERT (lseek (0, (off_t)-4, SEEK_CUR) == -1);
  43       ASSERT (errno == EINVAL);
  44       errno = 0;
  45 #if ! defined __BEOS__
  46       /* POSIX says that the last lseek call, when failing, does not change
  47          the current offset.  But BeOS sets it to 0.  */
  48       ASSERT (lseek (0, (off_t)0, SEEK_CUR) == 2);
  49 #endif
  50 #if 0 /* leads to SIGSYS on IRIX 6.5 */
  51       ASSERT (lseek (0, (off_t)0, (SEEK_SET | SEEK_CUR | SEEK_END) + 1) == -1);
  52       ASSERT (errno == EINVAL);
  53 #endif
  54       ASSERT (lseek (1, (off_t)2, SEEK_SET) == 2);
  55       errno = 0;
  56       ASSERT (lseek (1, (off_t)-4, SEEK_CUR) == -1);
  57       ASSERT (errno == EINVAL);
  58       errno = 0;
  59 #if ! defined __BEOS__
  60       /* POSIX says that the last lseek call, when failing, does not change
  61          the current offset.  But BeOS sets it to 0.  */
  62       ASSERT (lseek (1, (off_t)0, SEEK_CUR) == 2);
  63 #endif
  64 #if 0 /* leads to SIGSYS on IRIX 6.5 */
  65       ASSERT (lseek (1, (off_t)0, (SEEK_SET | SEEK_CUR | SEEK_END) + 1) == -1);
  66       ASSERT (errno == EINVAL);
  67 #endif
  68       break;
  69
  70     case '1': /* pipes */
  71       errno = 0;
  72       ASSERT (lseek (0, (off_t)0, SEEK_CUR) == -1);
  73       ASSERT (errno == ESPIPE);
  74       errno = 0;
  75       ASSERT (lseek (1, (off_t)0, SEEK_CUR) == -1);
  76       ASSERT (errno == ESPIPE);
  77       break;
  78
  79     case '2': /* closed */
  80       /* Explicitly close file descriptors 0 and 1.  The <&- and >&- in the
  81          invoking shell are not enough on HP-UX.  */
  82       close (0);
  83       close (1);
  84
  85       errno = 0;
  86       ASSERT (lseek (0, (off_t)0, SEEK_CUR) == -1);
  87       ASSERT (errno == EBADF);
  88
  89       errno = 0;
  90       ASSERT (lseek (1, (off_t)0, SEEK_CUR) == -1);
  91       ASSERT (errno == EBADF);
  92
  93       /* Test behaviour for invalid file descriptors.  */
  94       errno = 0;
  95       ASSERT (lseek (-1, (off_t)0, SEEK_CUR) == -1);
  96       ASSERT (errno == EBADF);
  97
  98       close (99);
  99       errno = 0;
 100       ASSERT (lseek (99, (off_t)0, SEEK_CUR) == -1);
 101       ASSERT (errno == EBADF);
 102
 103       break;
 104
 105     default:
 106       return 1;
 107     }
 108   return test_exit_status;
 109 }