lib/io_debug.h

   1 /*
   2  * Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation
   3  *
   4  * Author: Nikos Mavroyanopoulos
   5  *
   6  * This file is part of GNUTLS.
   7  *
   8  * The GNUTLS library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public License
  10  * as published by the Free Software Foundation; either version 2.1 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  21  * USA
  22  *
  23  */
  24
  25 /* This debug file was contributed by
  26  * Paul Sheer <psheer@icon.co.za>. Some changes were made by nmav.
  27  * Its purpose is to debug non blocking behaviour of gnutls. The included
  28  * send() and recv() functions return EAGAIN errors in random.
  29  *
  30  */
  31
  32 #ifdef IO_DEBUG
  33
  34 #include <gnutls_int.h>
  35
  36 #define EDUNNO EAGAIN           /* EAGAIN */
  37
  38 extern int errno;
  39 static int initialized_rand = 0;
  40
  41 #define INITIALIZE_RAND if (initialized_rand==0) {\
  42                 srand(time(0)); \
  43                 initialized_rand = 1; \
  44                 }
  45 static int
  46 recv_debug (int fd, char *buf, int len, int flags)
  47 {
  48   INITIALIZE_RAND;
  49
  50   if (!(rand () % IO_DEBUG))
  51     {
  52       errno = EDUNNO;
  53       return -1;
  54     }
  55   if (len > 1)
  56     len = 1;
  57   return recv (fd, buf, len, flags);
  58 }
  59
  60 #define recv recv_debug
  61
  62 static int
  63 send_debug (int fd, const char *buf, int len, int flags)
  64 {
  65   INITIALIZE_RAND;
  66
  67   if (!(rand () % IO_DEBUG))
  68     {
  69       errno = EDUNNO;
  70       return -1;
  71     }
  72   if (len > 10)
  73     len = 10;
  74   return send (fd, buf, len, flags);
  75 }
  76
  77 #define send send_debug
  78
  79 #endif