sysdeps/unix/sysv/linux/ptrace.c

   1 /* Copyright (C) 1995-2014 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <sys/types.h>
  20 #include <sys/ptrace.h>
  21 #include <sys/user.h>
  22 #include <stdarg.h>
  23 #include <signal.h>
  24
  25 #include <sysdep.h>
  26 #include <sys/syscall.h>
  27
  28 long int
  29 ptrace (enum __ptrace_request request, ...)
  30 {
  31   long int res, ret;
  32   va_list ap;
  33   pid_t pid;
  34   void *addr, *data;
  35
  36   va_start (ap, request);
  37   pid = va_arg (ap, pid_t);
  38   addr = va_arg (ap, void *);
  39   data = va_arg (ap, void *);
  40   va_end (ap);
  41
  42   if (request > 0 && request < 4)
  43     data = &ret;
  44
  45   res = INLINE_SYSCALL (ptrace, 4, request, pid, addr, data);
  46   if (res >= 0 && request > 0 && request < 4)
  47     {
  48       __set_errno (0);
  49       return ret;
  50     }
  51
  52   return res;
  53 }