-# serial 34
+# serial 45
# See if we need to use our replacement for Solaris' openat et al functions.
-dnl Copyright (C) 2004-2011 Free Software Foundation, Inc.
+dnl Copyright (C) 2004-2014 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_OPENAT],
[
AC_REQUIRE([gl_FCNTL_H_DEFAULTS])
- GNULIB_OPENAT=1
-
- AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
- GNULIB_FCHMODAT=1
- GNULIB_FSTATAT=1
- GNULIB_MKDIRAT=1
-
- AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
- GNULIB_FCHOWNAT=1
- GNULIB_UNLINKAT=1
-
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
- AC_CHECK_FUNCS_ONCE([fchmodat lchmod mkdirat openat unlinkat])
+ AC_CHECK_FUNCS_ONCE([openat])
AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
- AC_REQUIRE([gl_FUNC_UNLINK])
case $ac_cv_func_openat+$gl_cv_func_lstat_dereferences_slashed_symlink in
- yes+yes)
- # GNU/Hurd has unlinkat, but it has the same bug as unlink.
- if test $REPLACE_UNLINK = 1; then
- REPLACE_UNLINKAT=1
- fi ;;
+ yes+*yes)
+ ;;
yes+*)
# Solaris 9 has *at functions, but uniformly mishandles trailing
# slash in all of them.
REPLACE_OPENAT=1
- REPLACE_UNLINKAT=1
;;
*)
HAVE_OPENAT=0
- HAVE_UNLINKAT=0 # No known system with unlinkat but not openat
- gl_PREREQ_OPENAT;;
+ ;;
esac
- if test $ac_cv_func_fchmodat != yes; then
- HAVE_FCHMODAT=0
- fi
- if test $ac_cv_func_mkdirat != yes; then
- HAVE_MKDIRAT=0
- fi
- gl_FUNC_FCHOWNAT
- gl_FUNC_FSTATAT
-])
-
-# gl_FUNC_FCHOWNAT_DEREF_BUG([ACTION-IF-BUGGY[, ACTION-IF-NOT_BUGGY]])
-AC_DEFUN([gl_FUNC_FCHOWNAT_DEREF_BUG],
-[
- dnl Persuade glibc's <unistd.h> to declare fchownat().
- AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
-
- AC_CACHE_CHECK([whether fchownat works with AT_SYMLINK_NOFOLLOW],
- gl_cv_func_fchownat_nofollow_works,
- [
- gl_dangle=conftest.dangle
- # Remove any remnants of a previous test.
- rm -f $gl_dangle
- # Arrange for deletion of the temporary file this test creates.
- ac_clean_files="$ac_clean_files $gl_dangle"
- ln -s conftest.no-such $gl_dangle
- AC_RUN_IFELSE(
- [AC_LANG_SOURCE(
- [[
-#include <fcntl.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <sys/types.h>
-int
-main ()
-{
- return (fchownat (AT_FDCWD, "$gl_dangle", -1, getgid (),
- AT_SYMLINK_NOFOLLOW) != 0
- && errno == ENOENT);
-}
- ]])],
- [gl_cv_func_fchownat_nofollow_works=yes],
- [gl_cv_func_fchownat_nofollow_works=no],
- [gl_cv_func_fchownat_nofollow_works=no],
- )
- ])
- AS_IF([test $gl_cv_func_fchownat_nofollow_works = no], [$1], [$2])
-])
-
-# gl_FUNC_FCHOWNAT_EMPTY_FILENAME_BUG([ACTION-IF-BUGGY[, ACTION-IF-NOT_BUGGY]])
-AC_DEFUN([gl_FUNC_FCHOWNAT_EMPTY_FILENAME_BUG],
-[
- dnl Persuade glibc's <unistd.h> to declare fchownat().
- AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
-
- AC_CACHE_CHECK([whether fchownat works with an empty file name],
- [gl_cv_func_fchownat_empty_filename_works],
- [AC_RUN_IFELSE(
- [AC_LANG_PROGRAM(
- [[#include <unistd.h>
- #include <fcntl.h>
- ]],
- [[int fd;
- int ret;
- if (mkdir ("conftestdir", 0700) < 0)
- return 2;
- fd = open ("conftestdir", O_RDONLY);
- if (fd < 0)
- return 3;
- ret = fchownat (fd, "", -1, -1, 0);
- close (fd);
- rmdir ("conftestdir");
- return ret == 0;
- ]])],
- [gl_cv_func_fchownat_empty_filename_works=yes],
- [gl_cv_func_fchownat_empty_filename_works=no],
- [gl_cv_func_fchownat_empty_filename_works="guessing no"])
- ])
- AS_IF([test "$gl_cv_func_fchownat_empty_filename_works" != yes], [$1], [$2])
-])
-
-# If we have the fchownat function, and it has the bug (in glibc-2.4)
-# that it dereferences symlinks even with AT_SYMLINK_NOFOLLOW, then
-# use the replacement function.
-# Also if the fchownat function, like chown, has the trailing slash bug,
-# use the replacement function.
-# Also use the replacement function if fchownat is simply not available.
-AC_DEFUN([gl_FUNC_FCHOWNAT],
-[
- AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
- AC_REQUIRE([gl_FUNC_CHOWN])
- AC_CHECK_FUNC([fchownat],
- [gl_FUNC_FCHOWNAT_DEREF_BUG(
- [REPLACE_FCHOWNAT=1
- AC_DEFINE([FCHOWNAT_NOFOLLOW_BUG], [1],
- [Define to 1 if your platform has fchownat, but it cannot
- perform lchown tasks.])
- ])
- gl_FUNC_FCHOWNAT_EMPTY_FILENAME_BUG(
- [REPLACE_FCHOWNAT=1
- AC_DEFINE([FCHOWNAT_EMPTY_FILENAME_BUG], [1],
- [Define to 1 if your platform has fchownat, but it does
- not reject an empty file name.])
- ])
- if test $REPLACE_CHOWN = 1; then
- REPLACE_FCHOWNAT=1
- fi],
- [HAVE_FCHOWNAT=0])
-])
-
-# If we have the fstatat function, and it has the bug (in AIX 7.1)
-# that it does not fill in st_size correctly, use the replacement function.
-AC_DEFUN([gl_FUNC_FSTATAT],
-[
- AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
- AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
- AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
- AC_CHECK_FUNCS_ONCE([fstatat openat])
-
- if test $ac_cv_func_fstatat = no; then
- HAVE_FSTATAT=0
- else
- AC_CACHE_CHECK([whether fstatat fills in st_size etc.],
- [gl_cv_func_fstatat_st_size_etc],
- [gl_cv_func_fstatat_st_size_etc=no
- echo xxx >conftest.file
- AC_RUN_IFELSE(
- [AC_LANG_SOURCE(
- [[
- #include <fcntl.h>
- #include <sys/stat.h>
-
- int
- main (void)
- {
- struct stat a;
- struct stat b;
- if (fstatat (AT_FDCWD, "conftest.file", &a,
- AT_SYMLINK_NOFOLLOW)
- != 0)
- return 1;
- if (lstat ("conftest.file", &b) != 0)
- return 2;
- if (a.st_size != b.st_size) return 3;
- if (a.st_dev != b.st_dev) return 4;
- if (a.st_ino != b.st_ino) return 5;
- if (a.st_mode != b.st_mode) return 6;
- if (a.st_nlink != b.st_nlink) return 7;
- if (a.st_uid != b.st_uid) return 8;
- if (a.st_gid != b.st_gid) return 9;
- /* Don't check time members, to avoid caching issues. */
- return 0;
- }
- ]])],
- [gl_cv_func_fstatat_st_size_etc=yes])])
-
- case $gl_cv_func_fstatat_st_size_etc+$gl_cv_func_lstat_dereferences_slashed_symlink in
- yes+yes) ;;
- *) REPLACE_FSTATAT=1
- if test $gl_cv_func_fstatat_st_size_etc != yes; then
- AC_DEFINE([FSTATAT_ST_SIZE_ETC_BROKEN], [1],
- [Define to 1 if fstatat does not fill in st_size etc.,
- as in AIX 7.1.])
- fi
- ;;
- esac
- fi
])
+# Prerequisites of lib/openat.c.
AC_DEFUN([gl_PREREQ_OPENAT],
[
- AC_REQUIRE([AC_C_INLINE])
AC_REQUIRE([gl_PROMOTED_TYPE_MODE_T])
:
])
projects / gnulib.git / blobdiff