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-rw-r--r--m4/mmap-anon.m455
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diff --git a/m4/mmap-anon.m4 b/m4/mmap-anon.m4
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-# mmap-anon.m4 serial 9
-dnl Copyright (C) 2005, 2007, 2009-2010 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 Persuade glibc <sys/mman.h> to define MAP_ANONYMOUS.
- AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
-
- # Check for mmap(). Don't use AC_FUNC_MMAP, because it checks too much: it
- # fails on HP-UX 11, because MAP_FIXED mappings do not work. But this is
- # irrelevant for anonymous mappings.
- AC_CHECK_FUNC([mmap], [gl_have_mmap=yes], [gl_have_mmap=no])
-
- # Try to allow MAP_ANONYMOUS.
- gl_have_mmap_anonymous=no
- if test $gl_have_mmap = yes; then
- AC_MSG_CHECKING([for MAP_ANONYMOUS])
- AC_EGREP_CPP([I cant identify this map.], [
-#include <sys/mman.h>
-#ifdef MAP_ANONYMOUS
- I cant identify this map.
-#endif
-],
- [gl_have_mmap_anonymous=yes])
- if test $gl_have_mmap_anonymous != yes; then
- AC_EGREP_CPP([I cant identify this map.], [
-#include <sys/mman.h>
-#ifdef MAP_ANON
- I cant identify this map.
-#endif
-],
- [AC_DEFINE([MAP_ANONYMOUS], [MAP_ANON],
- [Define to a substitute value for mmap()'s MAP_ANONYMOUS flag.])
- gl_have_mmap_anonymous=yes])
- fi
- AC_MSG_RESULT([$gl_have_mmap_anonymous])
- if test $gl_have_mmap_anonymous = yes; then
- AC_DEFINE([HAVE_MAP_ANONYMOUS], [1],
- [Define to 1 if mmap()'s MAP_ANONYMOUS flag is available after including
- config.h and <sys/mman.h>.])
- fi
- fi
-])