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kolibrios/programs/develop/open watcom/trunk/clib/crt/cmdname.c

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/****************************************************************************
*
* Open Watcom Project
*
* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
* ========================================================================
*
* This file contains Original Code and/or Modifications of Original
* Code as defined in and that are subject to the Sybase Open Watcom
* Public License version 1.0 (the 'License'). You may not use this file
* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
* provided with the Original Code and Modifications, and is also
* available at www.sybase.com/developer/opensource.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
* NON-INFRINGEMENT. Please see the License for the specific language
* governing rights and limitations under the License.
*
* ========================================================================
*
* Description: Implementation of _cmdname().
*
****************************************************************************/
#ifdef __WATCOMC__
#include "variety.h"
#else
#define _WCRTLINK
#endif
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <limits.h>
extern char **_argv; /* argument vector */
/* NOTE: This file isn't used for QNX. It's got its own version. */
#ifdef __LINUX__
_WCRTLINK char *_cmdname( char *name )
{
int save_errno = errno;
int result = readlink( "/proc/self/exe", name, PATH_MAX );
errno = save_errno;
/* fall back to argv[0] if readlink doesn't work */
if( result == -1 || result == PATH_MAX )
return( strcpy( name, _argv[0] ) );
/* readlink does not add a NUL so we need to do it ourselves */
name[result] = '\0';
return( name );
}
#else
_WCRTLINK char *_cmdname( char *name )
{
return( strcpy( name, _argv[0] ) );
}
#endif