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  1. /****************************************************************************
  2. *
  3. *                            Open Watcom Project
  4. *
  5. *    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
  6. *
  7. *  ========================================================================
  8. *
  9. *    This file contains Original Code and/or Modifications of Original
  10. *    Code as defined in and that are subject to the Sybase Open Watcom
  11. *    Public License version 1.0 (the 'License'). You may not use this file
  12. *    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
  13. *    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
  14. *    provided with the Original Code and Modifications, and is also
  15. *    available at www.sybase.com/developer/opensource.
  16. *
  17. *    The Original Code and all software distributed under the License are
  18. *    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  19. *    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
  20. *    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
  21. *    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
  22. *    NON-INFRINGEMENT. Please see the License for the specific language
  23. *    governing rights and limitations under the License.
  24. *
  25. *  ========================================================================
  26. *
  27. * Description:  Implementation of _cmdname().
  28. *
  29. ****************************************************************************/
  30.  
  31.  
  32. #ifdef __WATCOMC__
  33.     #include "variety.h"
  34. #else
  35.     #define _WCRTLINK
  36. #endif
  37. #include <string.h>
  38. #include <unistd.h>
  39. #include <errno.h>
  40. #include <limits.h>
  41.  
  42. extern char **_argv;    /* argument vector */
  43.  
  44. /* NOTE: This file isn't used for QNX. It's got its own version. */
  45.  
  46. #ifdef __LINUX__
  47.  
  48. _WCRTLINK char *_cmdname( char *name )
  49. {
  50.     int save_errno = errno;
  51.     int result = readlink( "/proc/self/exe", name, PATH_MAX );
  52.  
  53.     errno = save_errno;
  54.  
  55.     /* fall back to argv[0] if readlink doesn't work */
  56.     if( result == -1 || result == PATH_MAX )
  57.         return( strcpy( name, _argv[0] ) );
  58.  
  59.     /* readlink does not add a NUL so we need to do it ourselves */
  60.     name[result] = '\0';
  61.     return( name );
  62. }
  63.  
  64. #else
  65.  
  66. _WCRTLINK char *_cmdname( char *name )
  67. {
  68.     return( strcpy( name, _argv[0] ) );
  69. }
  70.  
  71. #endif
  72.