--- /dev/null
+# flock.m4 serial 1
+dnl Copyright (C) 2008 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_FLOCK],
+[
+ AC_REQUIRE([gl_HEADER_SYS_FILE_H_DEFAULTS])
+ AC_CHECK_FUNCS_ONCE([flock])
+ if test $ac_cv_func_flock = no; then
+ HAVE_FLOCK=0
+ AC_LIBOBJ([flock])
+ gl_PREREQ_FLOCK
+ fi
+])
+
+dnl Prerequisites of lib/flock.c.
+AC_DEFUN([gl_PREREQ_FLOCK],
+[
+ AC_CHECK_FUNCS_ONCE([fcntl])
+ AC_CHECK_HEADERS_ONCE([unistd.h fcntl.h])
+
+ dnl Do we have a POSIX fcntl lock implementation?
+ AC_CHECK_MEMBERS([struct flock.l_type],[],[],[[#include <fcntl.h>]])
+])