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-rw-r--r--m4/flock.m424
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+# flock.m4 serial 4
+dnl Copyright (C) 2008-2022 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_SYS_FILE_H_DEFAULTS])
+ AC_CHECK_FUNCS_ONCE([flock])
+ if test $ac_cv_func_flock = no; then
+ HAVE_FLOCK=0
+ fi
+])
+
+dnl Prerequisites of lib/flock.c.
+AC_DEFUN([gl_PREREQ_FLOCK],
+[
+ AC_CHECK_FUNCS_ONCE([fcntl])
+ AC_CHECK_HEADERS_ONCE([unistd.h])
+
+ dnl Do we have a POSIX fcntl lock implementation?
+ AC_CHECK_MEMBERS([struct flock.l_type],[],[],[[#include <fcntl.h>]])
+])