-#serial 16
+# serial 27
# Determine whether we need the chown wrapper.
-dnl Copyright (C) 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005 Free
-dnl Software Foundation, Inc.
+dnl Copyright (C) 1997-2001, 2003-2005, 2007, 2009-2014 Free Software
+dnl Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
# From Jim Meyering.
-AC_DEFUN([gl_FUNC_CHOWN],
+m4_version_prereq([2.70], [] ,[
+
+# This is taken from the following Autoconf patch:
+# http://git.savannah.gnu.org/gitweb/?p=autoconf.git;a=commitdiff;h=7fbb553727ed7e0e689a17594b58559ecf3ea6e9
+AC_DEFUN([AC_FUNC_CHOWN],
+[
+ AC_REQUIRE([AC_TYPE_UID_T])dnl
+ AC_REQUIRE([AC_CANONICAL_HOST])dnl for cross-compiles
+ AC_CHECK_HEADERS([unistd.h])
+ AC_CACHE_CHECK([for working chown],
+ [ac_cv_func_chown_works],
+ [AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM(
+ [AC_INCLUDES_DEFAULT
+ [#include <fcntl.h>
+ ]],
+ [[
+ char *f = "conftest.chown";
+ struct stat before, after;
+
+ if (creat (f, 0600) < 0)
+ return 1;
+ if (stat (f, &before) < 0)
+ return 1;
+ if (chown (f, (uid_t) -1, (gid_t) -1) == -1)
+ return 1;
+ if (stat (f, &after) < 0)
+ return 1;
+ return ! (before.st_uid == after.st_uid && before.st_gid == after.st_gid);
+ ]])
+ ],
+ [ac_cv_func_chown_works=yes],
+ [ac_cv_func_chown_works=no],
+ [case "$host_os" in # ((
+ # Guess yes on glibc systems.
+ *-gnu*) ac_cv_func_chown_works=yes ;;
+ # If we don't know, assume the worst.
+ *) ac_cv_func_chown_works=no ;;
+ esac
+ ])
+ rm -f conftest.chown
+ ])
+ if test $ac_cv_func_chown_works = yes; then
+ AC_DEFINE([HAVE_CHOWN], [1],
+ [Define to 1 if your system has a working `chown' function.])
+ fi
+])# AC_FUNC_CHOWN
+
+])
+
+AC_DEFUN_ONCE([gl_FUNC_CHOWN],
[
+ AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
AC_REQUIRE([AC_TYPE_UID_T])
AC_REQUIRE([AC_FUNC_CHOWN])
AC_REQUIRE([gl_FUNC_CHOWN_FOLLOWS_SYMLINK])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CHECK_FUNCS_ONCE([chown fchown])
- if test $ac_cv_func_chown_works = no; then
- AC_DEFINE(CHOWN_FAILS_TO_HONOR_ID_OF_NEGATIVE_ONE, 1,
- [Define if chown is not POSIX compliant regarding IDs of -1.])
- fi
-
- # If chown has either of the above problems, then we need the wrapper.
- if test $ac_cv_func_chown_works$gl_cv_func_chown_follows_symlink = yesyes; then
- : # no wrapper needed
+ dnl mingw lacks chown altogether.
+ if test $ac_cv_func_chown = no; then
+ HAVE_CHOWN=0
else
- AC_LIBOBJ(chown)
- AC_DEFINE(chown, rpl_chown,
- [Define to rpl_chown if the replacement function should be used.])
- gl_PREREQ_CHOWN
+ dnl Some old systems treated chown like lchown.
+ if test $gl_cv_func_chown_follows_symlink = no; then
+ REPLACE_CHOWN=1
+ fi
+
+ dnl Some old systems tried to use uid/gid -1 literally.
+ if test $ac_cv_func_chown_works = no; then
+ AC_DEFINE([CHOWN_FAILS_TO_HONOR_ID_OF_NEGATIVE_ONE], [1],
+ [Define if chown is not POSIX compliant regarding IDs of -1.])
+ REPLACE_CHOWN=1
+ fi
+
+ dnl Solaris 9 ignores trailing slash.
+ dnl FreeBSD 7.2 mishandles trailing slash on symlinks.
+ dnl Likewise for AIX 7.1.
+ AC_CACHE_CHECK([whether chown honors trailing slash],
+ [gl_cv_func_chown_slash_works],
+ [touch conftest.file && rm -f conftest.link
+ AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+]], [[ if (symlink ("conftest.file", "conftest.link")) return 1;
+ if (chown ("conftest.link/", getuid (), getgid ()) == 0) return 2;
+ ]])],
+ [gl_cv_func_chown_slash_works=yes],
+ [gl_cv_func_chown_slash_works=no],
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_chown_slash_works="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_chown_slash_works="guessing no" ;;
+ esac
+ ])
+ rm -f conftest.link conftest.file])
+ case "$gl_cv_func_chown_slash_works" in
+ *yes) ;;
+ *)
+ AC_DEFINE([CHOWN_TRAILING_SLASH_BUG], [1],
+ [Define to 1 if chown mishandles trailing slash.])
+ REPLACE_CHOWN=1
+ ;;
+ esac
+
+ dnl OpenBSD fails to update ctime if ownership does not change.
+ AC_CACHE_CHECK([whether chown always updates ctime],
+ [gl_cv_func_chown_ctime_works],
+ [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+]], [[ struct stat st1, st2;
+ if (close (creat ("conftest.file", 0600))) return 1;
+ if (stat ("conftest.file", &st1)) return 2;
+ sleep (1);
+ if (chown ("conftest.file", st1.st_uid, st1.st_gid)) return 3;
+ if (stat ("conftest.file", &st2)) return 4;
+ if (st2.st_ctime <= st1.st_ctime) return 5;
+ ]])],
+ [gl_cv_func_chown_ctime_works=yes],
+ [gl_cv_func_chown_ctime_works=no],
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_chown_ctime_works="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_chown_ctime_works="guessing no" ;;
+ esac
+ ])
+ rm -f conftest.file])
+ case "$gl_cv_func_chown_ctime_works" in
+ *yes) ;;
+ *)
+ AC_DEFINE([CHOWN_CHANGE_TIME_BUG], [1], [Define to 1 if chown fails
+ to change ctime when at least one argument was not -1.])
+ REPLACE_CHOWN=1
+ ;;
+ esac
fi
])
# Determine whether chown follows symlinks (it should).
-AC_DEFUN([gl_FUNC_CHOWN_FOLLOWS_SYMLINK],
+AC_DEFUN_ONCE([gl_FUNC_CHOWN_FOLLOWS_SYMLINK],
[
AC_CACHE_CHECK(
- [whether chown(2) dereferences symlinks],
- gl_cv_func_chown_follows_symlink,
+ [whether chown dereferences symlinks],
+ [gl_cv_func_chown_follows_symlink],
[
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
- int
- main ()
- {
- char const *dangling_symlink = "conftest.dangle";
-
- unlink (dangling_symlink);
- if (symlink ("conftest.no-such", dangling_symlink))
- abort ();
-
- /* Exit successfully on a conforming system,
- i.e., where chown must fail with ENOENT. */
- exit ( ! (chown (dangling_symlink, getuid (), getgid ()) != 0
- && errno == ENOENT));
- }
- ]])],
- [gl_cv_func_chown_follows_symlink=yes],
- [gl_cv_func_chown_follows_symlink=no],
- [gl_cv_func_chown_follows_symlink=yes]
+ int
+ main ()
+ {
+ int result = 0;
+ char const *dangling_symlink = "conftest.dangle";
+
+ unlink (dangling_symlink);
+ if (symlink ("conftest.no-such", dangling_symlink))
+ abort ();
+
+ /* Exit successfully on a conforming system,
+ i.e., where chown must fail with ENOENT. */
+ if (chown (dangling_symlink, getuid (), getgid ()) == 0)
+ result |= 1;
+ if (errno != ENOENT)
+ result |= 2;
+ return result;
+ }
+ ]])],
+ [gl_cv_func_chown_follows_symlink=yes],
+ [gl_cv_func_chown_follows_symlink=no],
+ [gl_cv_func_chown_follows_symlink=yes]
)
]
)
if test $gl_cv_func_chown_follows_symlink = no; then
- AC_DEFINE(CHOWN_MODIFIES_SYMLINK, 1,
+ AC_DEFINE([CHOWN_MODIFIES_SYMLINK], [1],
[Define if chown modifies symlinks.])
fi
])
-
-# Prerequisites of lib/chown.c.
-AC_DEFUN([gl_PREREQ_CHOWN],
-[
- AC_CHECK_FUNC([fchown], , [AC_LIBOBJ(fchown-stub)])
-])
projects / gnulib.git / blobdiff