mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-23 07:19:15 +00:00
220a9ecba1
This incorporates: 2018-01-01 maint: Run 'make update-copyright' 2017-12-29 Add cross-compilation results for GNU/Hurd. 2017-12-12 explicit_bzero: port to macOS + Clang 9.0.0
96 lines
2.7 KiB
Plaintext
96 lines
2.7 KiB
Plaintext
# open.m4 serial 15
|
|
dnl Copyright (C) 2007-2018 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_OPEN],
|
|
[
|
|
AC_REQUIRE([AC_CANONICAL_HOST])
|
|
AC_REQUIRE([gl_PREPROC_O_CLOEXEC])
|
|
case "$host_os" in
|
|
mingw* | pw*)
|
|
REPLACE_OPEN=1
|
|
;;
|
|
*)
|
|
dnl open("foo/") should not create a file when the file name has a
|
|
dnl trailing slash. FreeBSD only has the problem on symlinks.
|
|
AC_CHECK_FUNCS_ONCE([lstat])
|
|
if test "$gl_cv_macro_O_CLOEXEC" != yes; then
|
|
REPLACE_OPEN=1
|
|
fi
|
|
AC_CACHE_CHECK([whether open recognizes a trailing slash],
|
|
[gl_cv_func_open_slash],
|
|
[# Assume that if we have lstat, we can also check symlinks.
|
|
if test $ac_cv_func_lstat = yes; then
|
|
touch conftest.tmp
|
|
ln -s conftest.tmp conftest.lnk
|
|
fi
|
|
AC_RUN_IFELSE(
|
|
[AC_LANG_SOURCE([[
|
|
#include <fcntl.h>
|
|
#if HAVE_UNISTD_H
|
|
# include <unistd.h>
|
|
#endif
|
|
int main ()
|
|
{
|
|
int result = 0;
|
|
#if HAVE_LSTAT
|
|
if (open ("conftest.lnk/", O_RDONLY) != -1)
|
|
result |= 1;
|
|
#endif
|
|
if (open ("conftest.sl/", O_CREAT, 0600) >= 0)
|
|
result |= 2;
|
|
return result;
|
|
}]])],
|
|
[gl_cv_func_open_slash=yes],
|
|
[gl_cv_func_open_slash=no],
|
|
[
|
|
changequote(,)dnl
|
|
case "$host_os" in
|
|
freebsd* | aix* | hpux* | solaris2.[0-9] | solaris2.[0-9].*)
|
|
gl_cv_func_open_slash="guessing no" ;;
|
|
*)
|
|
gl_cv_func_open_slash="guessing yes" ;;
|
|
esac
|
|
changequote([,])dnl
|
|
])
|
|
rm -f conftest.sl conftest.tmp conftest.lnk
|
|
])
|
|
case "$gl_cv_func_open_slash" in
|
|
*no)
|
|
AC_DEFINE([OPEN_TRAILING_SLASH_BUG], [1],
|
|
[Define to 1 if open() fails to recognize a trailing slash.])
|
|
REPLACE_OPEN=1
|
|
;;
|
|
esac
|
|
;;
|
|
esac
|
|
dnl Replace open() for supporting the gnulib-defined fchdir() function,
|
|
dnl to keep fchdir's bookkeeping up-to-date.
|
|
m4_ifdef([gl_FUNC_FCHDIR], [
|
|
if test $REPLACE_OPEN = 0; then
|
|
gl_TEST_FCHDIR
|
|
if test $HAVE_FCHDIR = 0; then
|
|
REPLACE_OPEN=1
|
|
fi
|
|
fi
|
|
])
|
|
dnl Replace open() for supporting the gnulib-defined O_NONBLOCK flag.
|
|
m4_ifdef([gl_NONBLOCKING_IO], [
|
|
if test $REPLACE_OPEN = 0; then
|
|
gl_NONBLOCKING_IO
|
|
if test $gl_cv_have_open_O_NONBLOCK != yes; then
|
|
REPLACE_OPEN=1
|
|
fi
|
|
fi
|
|
])
|
|
])
|
|
|
|
# Prerequisites of lib/open.c.
|
|
AC_DEFUN([gl_PREREQ_OPEN],
|
|
[
|
|
AC_REQUIRE([gl_PROMOTED_TYPE_MODE_T])
|
|
:
|
|
])
|