update CLib startup code

git-svn-id: svn://kolibrios.org@615 a494cfbc-eb01-0410-851d-a64ba20cac60

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

@@ -0,0 +1,71 @@
+/****************************************************************************
+*
+*                            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