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Add comments.
author
Bruno Haible
<bruno@clisp.org>
Wed, 13 May 2009 00:03:30 +0000
(
02:03
+0200)
committer
Bruno Haible
<bruno@clisp.org>
Wed, 13 May 2009 00:03:30 +0000
(
02:03
+0200)
ChangeLog
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m4/mmap-anon.m4
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diff --git
a/ChangeLog
b/ChangeLog
index ba732851b8007d6bb749eb60cdeffffbe5de8b6e..ffa4100a382ed9fdd2bb806861045f8b28447e0c 100644
(file)
--- a/
ChangeLog
+++ b/
ChangeLog
@@
-1,3
+1,7
@@
+2009-05-12 Bruno Haible <bruno@clisp.org>
+
+ * m4/mmap-anon.m4 (gl_FUNC_MMAP_ANON): Add comments.
+
2009-05-12 Jim Meyering <meyering@redhat.com>
* top/maint.mk: Adjust backslash alignment.
2009-05-12 Jim Meyering <meyering@redhat.com>
* top/maint.mk: Adjust backslash alignment.
diff --git
a/m4/mmap-anon.m4
b/m4/mmap-anon.m4
index 025c904e4131ea8f118d1641cde75a8df6875be2..91cd95b232862850cad26daa3732ce8902ab4aab 100644
(file)
--- 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.
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.
AC_DEFUN([gl_FUNC_MMAP_ANON],
[
dnl Work around a bug of AC_EGREP_CPP in autoconf-2.57.