sysdeps/unix/sysv/linux/ptrace.c

   1 /* Copyright (C) 1995, 1996 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
  16 not, 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/ptrace.h>
  21 #include <sys/syscall.h>
  22
  23 int
  24 ptrace (int request, int pid, int addr, int data)
  25 {
  26   long int ret;
  27   long int res;
  28   if (request > 0 && request < 4)
  29     (long int *) data = &ret;
  30
  31   res = __syscall_ptrace (request, pid, addr, data);
  32
  33   if (res >= 0)
  34     {
  35       if (request > 0 && request < 4)
  36         {
  37           errno = 0;
  38           return (ret);
  39         }
  40       return (int) res;
  41     }
  42
  43   errno = -res;
  44   return -1;
  45 }