1  /* Copyright (C) 1995-2023 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     <https://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  }