flock: new module

[gnulib.git] / m4 / sys_file_h.m4

diff --git a/m4/sys_file_h.m4 b/m4/sys_file_h.m4
new file mode 100644 (file)
index 0000000..436c6fe
--- /dev/null
+++ b/m4/sys_file_h.m4
@@ -0,0 +1,41 @@
+# Configure a replacement for <sys/file.h>.
+
+# Copyright (C) 2008 Free Software Foundation, Inc.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# Written by Richard W.M. Jones.
+
+AC_DEFUN([gl_HEADER_SYS_FILE_H],
+[
+  AC_REQUIRE([gl_HEADER_SYS_FILE_H_DEFAULTS])
+
+  dnl Only flock is defined in a working <sys/file.h>.  If that
+  dnl function is already there, we don't want to do any substitution.
+  AC_CHECK_FUNCS_ONCE([flock])
+
+  gl_CHECK_NEXT_HEADERS([sys/file.h])
+  SYS_FILE_H='sys/file.h'
+  AC_SUBST([SYS_FILE_H])
+
+  AC_CHECK_HEADERS_ONCE([sys/file.h])
+  if test $ac_cv_header_sys_file_h = yes; then
+    HAVE_SYS_FILE_H=1
+  else
+    HAVE_SYS_FILE_H=0
+  fi
+  AC_SUBST([HAVE_SYS_FILE_H])
+])
+
+AC_DEFUN([gl_HEADER_SYS_FILE_MODULE_INDICATOR],
+[
+  AC_REQUIRE([gl_HEADER_SYS_FILE_H_DEFAULTS])
+  GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1
+])
+
+AC_DEFUN([gl_HEADER_SYS_FILE_H_DEFAULTS],
+[
+  GNULIB_FLOCK=0;        AC_SUBST([GNULIB_FLOCK])
+  HAVE_FLOCK=1;          AC_SUBST([HAVE_FLOCK])
+])