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# flock.m4 serial 3
dnl Copyright (C) 2008-2020 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
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>]])
])
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