File: lseek.m4

package info (click to toggle)
shishi 1.0.0-1
  • links: PTS, VCS
  • area: main
  • in suites: squeeze
  • size: 22,144 kB
  • ctags: 7,865
  • sloc: ansic: 61,153; sh: 12,212; yacc: 1,219; makefile: 1,164; perl: 624; sed: 16
file content (51 lines) | stat: -rw-r--r-- 1,654 bytes parent folder | download | duplicates (19)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
# lseek.m4 serial 5
dnl Copyright (C) 2007, 2009, 2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

AC_DEFUN([gl_FUNC_LSEEK],
[
  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
  AC_REQUIRE([AC_PROG_CC])
  AC_CACHE_CHECK([whether lseek detects pipes], [gl_cv_func_lseek_pipe],
    [if test $cross_compiling = no; then
       AC_LINK_IFELSE([
#include <sys/types.h> /* for off_t */
#include <stdio.h> /* for SEEK_CUR */
#include <unistd.h>
int main ()
{
  /* Exit with success only if stdin is seekable.  */
  return lseek (0, (off_t)0, SEEK_CUR) < 0;
}],
         [if test -s conftest$ac_exeext \
             && ./conftest$ac_exeext < conftest.$ac_ext \
             && test 1 = "`echo hi \
               | { ./conftest$ac_exeext; echo $?; cat >/dev/null; }`"; then
            gl_cv_func_lseek_pipe=yes
          else
            gl_cv_func_lseek_pipe=no
          fi],
         [gl_cv_func_lseek_pipe=no])
     else
       AC_COMPILE_IFELSE([
#if ((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__) || defined __BEOS__
/* mingw and BeOS mistakenly return 0 when trying to seek on pipes.  */
  Choke me.
#endif],
         [gl_cv_func_lseek_pipe=yes], [gl_cv_func_lseek_pipe=no])
     fi])
  if test $gl_cv_func_lseek_pipe = no; then
    gl_REPLACE_LSEEK
  fi
])

AC_DEFUN([gl_REPLACE_LSEEK],
[
  AC_LIBOBJ([lseek])
  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
  REPLACE_LSEEK=1
  AC_DEFINE([LSEEK_PIPE_BROKEN], [1],
            [Define to 1 if lseek does not detect pipes.])
])