AC_DEFUN([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])
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 test $ac_cv_func_chown_works$gl_cv_func_chown_follows_symlink = yesyes; then
: else
REPLACE_CHOWN=1
AC_LIBOBJ(chown)
gl_PREREQ_CHOWN
fi
])
AC_DEFUN([gl_FUNC_CHOWN_FOLLOWS_SYMLINK],
[
AC_CACHE_CHECK(
[whether chown(2) dereferences symlinks],
gl_cv_func_chown_follows_symlink,
[
AC_RUN_IFELSE([AC_LANG_SOURCE([[
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]
)
]
)
if test $gl_cv_func_chown_follows_symlink = no; then
AC_DEFINE(CHOWN_MODIFIES_SYMLINK, 1,
[Define if chown modifies symlinks.])
fi
])
AC_DEFUN([gl_PREREQ_CHOWN],
[
AC_CHECK_FUNC([fchown], , [AC_LIBOBJ(fchown-stub)])
])