Not exactly.
This file is needed for VERY old libc implementations.
I don't think these exists anymore in supported configurations.
If we find memcmp() is missing, we add it properly to compat.
2012/3/6 Samuli Seppänen <sam...@openvpn.net>:
>
>> Signed-off-by: Alon Bar-Lev <alon.bar...@gmail.com>
>> ---
>> configure.ac | 3 ---
>> memcmp.c | 43 -------------------------------------------
>> 2 files changed, 0 insertions(+), 46 deletions(-)
>> delete mode 100644 memcmp.c
>>
>> diff --git a/configure.ac b/configure.ac
>> index 25dcc37..1c4d66c 100644
>> --- a/configure.ac
>> +++ b/configure.ac
>> @@ -564,9 +564,6 @@ else
>>
>> fi
>>
>> -dnl Required library functions
>> -AC_FUNC_MEMCMP
>> -
>> dnl
>> dnl Check for res_init
>> dnl
>> diff --git a/memcmp.c b/memcmp.c
>> deleted file mode 100644
>> index d921aac..0000000
>> --- a/memcmp.c
>> +++ /dev/null
>> @@ -1,43 +0,0 @@
>> -/*
>> - * OpenVPN -- An application to securely tunnel IP networks
>> - * over a single TCP/UDP port, with support for SSL/TLS-based
>> - * session authentication and key exchange,
>> - * packet encryption, packet authentication, and
>> - * packet compression.
>> - *
>> - * Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sa...@openvpn.net>
>> - *
>> - * This program is free software; you can redistribute it and/or modify
>> - * it under the terms of the GNU General Public License version 2
>> - * as published by the Free Software Foundation.
>> - *
>> - * This program is distributed in the hope that it will be useful,
>> - * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> - * GNU General Public License for more details.
>> - *
>> - * You should have received a copy of the GNU General Public License
>> - * along with this program (see the file COPYING included with this
>> - * distribution); if not, write to the Free Software Foundation, Inc.,
>> - * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
>> - */
>> -
>> -#include "syshead.h"
>> -
>> -#include "memdbg.h"
>> -
>> -int
>> -memcmp (const void *s1, const void *s2, size_t n)
>> -{
>> - unsigned const char *p1 = s1, *p2 = s2;
>> - int d;
>> -
>> - if (n)
>> - while (n-- > 0)
>> - {
>> - d = *p1++ - *p2++;
>> - if (d != 0)
>> - return d;
>> - }
>> - return 0;
>> -}
>
> My C-fu is fairly low, but this still seems to make sense as there's no
> memcmp.h. The memcmp function calls in other source files seem to use
> memcmp function stored elsewhere (gcc[1], libc[2], etc.).
>
> ACK.
>
> --
> Samuli Seppänen
> Community Manager
> OpenVPN Technologies, Inc
>
> irc freenode net: mattock
>
>
> [1] <http://justin.harmonize.fm/index.php/2009/05/exploring-memcmp>
> [2]
> <http://www.slac.stanford.edu/comp/unix/package/rtems/doc/html/libc/libc.info.memcmp.html>
