From 35684203ea9951bc0634065e7ae2120fc8372591 Mon Sep 17 00:00:00 2001 From: Bruno Haible Date: Wed, 13 May 2009 02:03:30 +0200 Subject: [PATCH] Add comments. --- ChangeLog | 4 ++++ m4/mmap-anon.m4 | 11 ++++++++++- 2 files changed, 14 insertions(+), 1 deletion(-) diff --git a/ChangeLog b/ChangeLog index ba732851b8..ffa4100a38 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,7 @@ +2009-05-12 Bruno Haible + + * m4/mmap-anon.m4 (gl_FUNC_MMAP_ANON): Add comments. + 2009-05-12 Jim Meyering * top/maint.mk: Adjust backslash alignment. diff --git a/m4/mmap-anon.m4 b/m4/mmap-anon.m4 index 025c904e41..91cd95b232 100644 --- a/m4/mmap-anon.m4 +++ b/m4/mmap-anon.m4 @@ -1,9 +1,18 @@ -# mmap-anon.m4 serial 5 +# mmap-anon.m4 serial 6 dnl Copyright (C) 2005, 2007, 2009 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. +# Detect how mmap can be used to create anonymous (not file-backed) memory +# mappings. +# - On Linux, AIX, OSF/1, Solaris, Cygwin, Interix, Haiku, both MAP_ANONYMOUS +# and MAP_ANON exist and have the same value. +# - On HP-UX, only MAP_ANONYMOUS exists. +# - On MacOS X, FreeBSD, NetBSD, OpenBSD, only MAP_ANON exists. +# - On IRIX, neither exists, and a file descriptor opened to /dev/zero must be +# used. + AC_DEFUN([gl_FUNC_MMAP_ANON], [ dnl Work around a bug of AC_EGREP_CPP in autoconf-2.57. -- 2.30.2