sysdeps/unix/sysv/linux/ptrace.c

   1 /* Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <errno.h>
  20 #include <sys/types.h>
  21 #include <sys/ptrace.h>
  22 #include <stdarg.h>
  23
  24 extern long int __syscall_ptrace (int, pid_t, void *, void *);
  25
  26 long int
  27 ptrace (enum __ptrace_request request, ...)
  28 {
  29   long int res, ret;
  30   va_list ap;
  31   pid_t pid;
  32   void *addr, *data;
  33
  34   va_start (ap, request);
  35   pid = va_arg (ap, pid_t);
  36   addr = va_arg (ap, void *);
  37   data = va_arg (ap, void *);
  38   va_end (ap);
  39
  40   if (request > 0 && request < 4)
  41     data = &ret;
  42
  43   res = __syscall_ptrace (request, pid, addr, data);
  44
  45   if (res >= 0)
  46     {
  47       if (request > 0 && request < 4)
  48         {
  49           __set_errno (0);
  50           return ret;
  51         }
  52       return res;
  53     }
  54
  55   return -1;
  56 }