projects
/
gnulib.git
/ blobdiff
commit
grep
author
committer
pickaxe
?
search:
re
summary
|
shortlog
|
log
|
commit
|
commitdiff
|
tree
raw
|
inline
| side by side
New module 'asinf'.
[gnulib.git]
/
m4
/
dup2.m4
diff --git
a/m4/dup2.m4
b/m4/dup2.m4
index
73a3209
..
cd9d254
100644
(file)
--- a/
m4/dup2.m4
+++ b/
m4/dup2.m4
@@
-1,5
+1,5
@@
-#serial 1
0
-dnl Copyright (C) 2002, 2005, 2007, 2009 Free Software Foundation, Inc.
+#serial 1
6
+dnl Copyright (C) 2002, 2005, 2007, 2009
-2011
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.
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.
@@
-8,24
+8,38
@@
AC_DEFUN([gl_FUNC_DUP2],
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST])
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST])
- AC_CHECK_FUNCS_ONCE([dup2])
- if test $ac_cv_func_dup2 = no; then
- HAVE_DUP2=0
- AC_LIBOBJ([dup2])
- else
+ m4_ifdef([gl_FUNC_DUP2_OBSOLETE], [
+ AC_CHECK_FUNCS_ONCE([dup2])
+ if test $ac_cv_func_dup2 = no; then
+ HAVE_DUP2=0
+ fi
+ ], [
+ AC_DEFINE([HAVE_DUP2], [1], [Define to 1 if you have the 'dup2' function.])
+ ])
+ if test $HAVE_DUP2 = 1; then
AC_CACHE_CHECK([whether dup2 works], [gl_cv_func_dup2_works],
[AC_RUN_IFELSE([
AC_LANG_PROGRAM([[#include <unistd.h>
AC_CACHE_CHECK([whether dup2 works], [gl_cv_func_dup2_works],
[AC_RUN_IFELSE([
AC_LANG_PROGRAM([[#include <unistd.h>
+#include <fcntl.h>
#include <errno.h>]],
#include <errno.h>]],
- [if (dup2 (1, 1) == 0)
- return 1;
+ [int result = 0;
+#ifdef FD_CLOEXEC
+ if (fcntl (1, F_SETFD, FD_CLOEXEC) == -1)
+ result |= 1;
+#endif
+ if (dup2 (1, 1) == 0)
+ result |= 2;
+#ifdef FD_CLOEXEC
+ if (fcntl (1, F_GETFD) != FD_CLOEXEC)
+ result |= 4;
+#endif
close (0);
if (dup2 (0, 0) != -1)
close (0);
if (dup2 (0, 0) != -1)
- re
turn 2
;
+ re
sult |= 8
;
/* Many gnulib modules require POSIX conformance of EBADF. */
/* Many gnulib modules require POSIX conformance of EBADF. */
- if (dup2 (
1
, 1000000) == -1 && errno != EBADF)
- re
turn 3
;
- return
0
;
+ if (dup2 (
2
, 1000000) == -1 && errno != EBADF)
+ re
sult |= 16
;
+ return
result
;
])
],
[gl_cv_func_dup2_works=yes], [gl_cv_func_dup2_works=no],
])
],
[gl_cv_func_dup2_works=yes], [gl_cv_func_dup2_works=no],
@@
-39,20
+53,24
@@
AC_DEFUN([gl_FUNC_DUP2],
gl_cv_func_dup2_works=no;;
freebsd*) # on FreeBSD 6.1, dup2(1,1000000) gives EMFILE, not EBADF.
gl_cv_func_dup2_works=no;;
gl_cv_func_dup2_works=no;;
freebsd*) # on FreeBSD 6.1, dup2(1,1000000) gives EMFILE, not EBADF.
gl_cv_func_dup2_works=no;;
+ haiku*) # on Haiku alpha 2, dup2(1, 1) resets FD_CLOEXEC.
+ gl_cv_func_dup2_works=no;;
*) gl_cv_func_dup2_works=yes;;
esac])
])
if test "$gl_cv_func_dup2_works" = no; then
*) gl_cv_func_dup2_works=yes;;
esac])
])
if test "$gl_cv_func_dup2_works" = no; then
- gl_REPLACE_DUP2
+ REPLACE_DUP2=1
fi
fi
fi
fi
+ dnl Replace dup2() for supporting the gnulib-defined fchdir() function,
+ dnl to keep fchdir's bookkeeping up-to-date.
+ m4_ifdef([gl_FUNC_FCHDIR], [
+ gl_TEST_FCHDIR
+ if test $HAVE_FCHDIR = 0; then
+ REPLACE_DUP2=1
+ fi
+ ])
])
])
-AC_DEFUN([gl_REPLACE_DUP2],
-[
- AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
- if test $ac_cv_func_dup2 = yes; then
- REPLACE_DUP2=1
- fi
- AC_LIBOBJ([dup2])
-])
+# Prerequisites of lib/dup2.c.
+AC_DEFUN([gl_PREREQ_DUP2], [])