sysdeps/unix/sysv/linux/ptrace.c

   1 /* Copyright (C) 1995, 1996, 1997, 1998 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 #include <sysdep.h>
  25 #include <sys/syscall.h>
  26
  27 extern long int __syscall_ptrace (int, pid_t, void *, void *);
  28
  29 long int
  30 ptrace (enum __ptrace_request request, ...)
  31 {
  32   long int res, ret;
  33   va_list ap;
  34   pid_t pid;
  35   void *addr, *data;
  36
  37   va_start (ap, request);
  38   pid = va_arg (ap, pid_t);
  39   addr = va_arg (ap, void *);
  40   data = va_arg (ap, void *);
  41   va_end (ap);
  42
  43   if (request > 0 && request < 4)
  44     data = &ret;
  45
  46   res = INLINE_SYSCALL (ptrace, 4, request, pid, addr, data);
  47   if (res >= 0 && request > 0 && request < 4)
  48     {
  49       __set_errno (0);
  50       return ret;
  51     }
  52
  53   return res;
  54 }