radio/src/syscalls.c

   1 /*
   2  * Copyright (C) OpenTX
   3  *
   4  * Based on code named
   5  *   th9x - http://code.google.com/p/th9x
   6  *   er9x - http://code.google.com/p/er9x
   7  *   gruvin9x - http://code.google.com/p/gruvin9x
   8  *
   9  * License GPLv2: http://www.gnu.org/licenses/gpl-2.0.html
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  */
  20
  21 #include <stdio.h>
  22 #include <stdarg.h>
  23 #include <sys/types.h>
  24 #include <sys/stat.h>
  25 #include <errno.h>
  26 #include "debug.h"
  27
  28 #undef errno
  29 extern int errno;
  30 extern int _end;
  31 extern int _heap_end;
  32
  33 unsigned char * heap = (unsigned char *)&_end;
  34
  35 extern caddr_t _sbrk(int nbytes)
  36 {
  37   if (heap + nbytes < (unsigned char *)&_heap_end) {
  38     unsigned char * prev_heap = heap;
  39     heap += nbytes;
  40     return (caddr_t)prev_heap;
  41   }
  42   else {
  43     errno = ENOMEM;
  44     return ((void *)-1);
  45   }
  46 }
  47
  48 #if !defined(SEMIHOSTING)
  49 extern int _gettimeofday(void *p1, void *p2)
  50 {
  51   return 0;
  52 }
  53
  54 extern int _link(char *old, char *nw)
  55 {
  56   return -1;
  57 }
  58
  59 extern int _unlink(const char *path)
  60 {
  61   return -1;
  62 }
  63
  64 extern int _open(const char *name, int flags, int mode)
  65 {
  66   return -1;
  67 }
  68
  69 extern int _close(int file)
  70 {
  71   return -1;
  72 }
  73
  74 extern int _fstat(int file, struct stat * st)
  75 {
  76   st->st_mode = S_IFCHR ;
  77   return 0;
  78 }
  79
  80 extern int _isatty(int file)
  81 {
  82   return 1;
  83 }
  84
  85 extern int _lseek(int file, int ptr, int dir)
  86 {
  87   return 0;
  88 }
  89
  90 extern int _read(int file, char *ptr, int len)
  91 {
  92   return 0;
  93 }
  94
  95 extern int _write(int file, char *ptr, int len)
  96 {
  97   return 0;
  98 }
  99
 100 extern void _exit(int status)
 101 {
 102   TRACE("_exit(%d)", status);
 103   for (;;);
 104 }
 105
 106 extern void _kill(int pid, int sig)
 107 {
 108   return ;
 109 }
 110
 111 extern int _getpid()
 112 {
 113     return -1 ;
 114 }
 115 #endif
 116