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#serial 3
dnl From Jim Meyering.
dnl Determine whether chown accepts arguments of -1 for uid and gid.
dnl If it doesn't, arrange to use the replacement function.
dnl
dnl If you use this macro in a package, you should
dnl add the following two lines to acconfig.h:
dnl /* Define to rpl_chown if the replacement function should be used. */
dnl #undef chown
dnl
AC_DEFUN(jm_FUNC_CHOWN,
[AC_REQUIRE([AC_TYPE_UID_T])dnl
test -z "$ac_cv_header_unistd_h" \
&& AC_CHECK_HEADERS(unistd.h)
AC_CACHE_CHECK([for working chown], jm_cv_func_working_chown,
[AC_TRY_RUN([
# include <sys/types.h>
# include <sys/stat.h>
# include <fcntl.h>
# ifdef HAVE_UNISTD_H
# include <unistd.h>
# endif
int
main ()
{
char *f = "conftestchown";
struct stat before, after;
if (creat (f, 0600) < 0)
exit (1);
if (stat (f, &before) < 0)
exit (1);
if (chown (f, (uid_t) -1, (gid_t) -1) == -1)
exit (1);
if (stat (f, &after) < 0)
exit (1);
exit ((before.st_uid == after.st_uid
&& before.st_gid == after.st_gid) ? 0 : 1);
}
],
jm_cv_func_working_chown=yes,
jm_cv_func_working_chown=no,
dnl When crosscompiling, assume chown is broken.
jm_cv_func_working_chown=no)
])
if test $jm_cv_func_working_chown = no; then
LIBOBJS="$LIBOBJS chown.o"
AC_DEFINE_UNQUOTED(chown, rpl_chown)
fi
])
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