-#serial 11
-dnl Copyright (C) 2002, 2005, 2007, 2009-2010 Free Software Foundation, Inc.
+#serial 14
+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.
[
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
+ AC_LIBOBJ([dup2])
+ 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>
+#include <fcntl.h>
#include <errno.h>]],
[int result = 0;
- if (dup2 (1, 1) == 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)
- result |= 2;
+ result |= 8;
/* Many gnulib modules require POSIX conformance of EBADF. */
- if (dup2 (1, 1000000) == -1 && errno != EBADF)
- result |= 4;
+ if (dup2 (2, 1000000) == -1 && errno != EBADF)
+ result |= 16;
return result;
])
],
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])
])
gl_REPLACE_DUP2
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
+ gl_REPLACE_DUP2
+ fi
+ ])
])
AC_DEFUN([gl_REPLACE_DUP2],
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+ AC_CHECK_FUNCS_ONCE([dup2])
if test $ac_cv_func_dup2 = yes; then
REPLACE_DUP2=1
fi