Andrew's git - arduino-weather.git/blob - libraries/Bridge/src/Process.cpp

   1/*
   2  Copyright (c) 2013 Arduino LLC. All right reserved.
   3
   4  This 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  This 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 this library; if not, write to the Free Software
  16  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  17*/
  18
  19#include <Process.h>
  20
  21Process::~Process() {
  22  close();
  23}
  24
  25size_t Process::write(uint8_t c) {
  26  uint8_t cmd[] = {'I', handle, c};
  27  bridge.transfer(cmd, 3);
  28  return 1;
  29}
  30
  31void Process::flush() {
  32}
  33
  34int Process::available() {
  35  // Look if there is new data available
  36  doBuffer();
  37  return buffered;
  38}
  39
  40int Process::read() {
  41  doBuffer();
  42  if (buffered == 0)
  43    return -1; // no chars available
  44  else {
  45    buffered--;
  46    return buffer[readPos++];
  47  }
  48}
  49
  50int Process::peek() {
  51  doBuffer();
  52  if (buffered == 0)
  53    return -1; // no chars available
  54  else
  55    return buffer[readPos];
  56}
  57
  58void Process::doBuffer() {
  59  // If there are already char in buffer exit
  60  if (buffered > 0)
  61    return;
  62
  63  // Try to buffer up to 32 characters
  64  readPos = 0;
  65  uint8_t cmd[] = {'O', handle, sizeof(buffer)};
  66  buffered = bridge.transfer(cmd, 3, buffer, sizeof(buffer));
  67}
  68
  69void Process::begin(const String &command) {
  70  close();
  71  cmdline = new String(command);
  72}
  73
  74void Process::addParameter(const String &param) {
  75  *cmdline += "\xFE";
  76  *cmdline += param;
  77}
  78
  79void Process::runAsynchronously() {
  80  uint8_t cmd[] = {'R'};
  81  uint8_t res[2];
  82  bridge.transfer(cmd, 1, (uint8_t*)cmdline->c_str(), cmdline->length(), res, 2);
  83  handle = res[1];
  84
  85  delete cmdline;
  86  cmdline = NULL;
  87
  88  if (res[0] == 0) // res[0] contains error code
  89    started = true;
  90}
  91
  92boolean Process::running() {
  93  uint8_t cmd[] = {'r', handle};
  94  uint8_t res[1];
  95  bridge.transfer(cmd, 2, res, 1);
  96  return (res[0] == 1);
  97}
  98
  99unsigned int Process::exitValue() {
 100  uint8_t cmd[] = {'W', handle};
 101  uint8_t res[2];
 102  bridge.transfer(cmd, 2, res, 2);
 103  return (res[0] << 8) + res[1];
 104}
 105
 106unsigned int Process::run() {
 107  runAsynchronously();
 108  while (running())
 109    delay(100);
 110  return exitValue();
 111}
 112
 113void Process::close() {
 114  if (started) {
 115    uint8_t cmd[] = {'w', handle};
 116    bridge.transfer(cmd, 2);
 117  }
 118  started = false;
 119}
 120
 121unsigned int Process::runShellCommand(const String &command) {
 122  runShellCommandAsynchronously(command);
 123  while (running())
 124    delay(100);
 125  return exitValue();
 126}
 127
 128void Process::runShellCommandAsynchronously(const String &command) {
 129  begin("/bin/ash");
 130  addParameter("-c");
 131  addParameter(command);
 132  runAsynchronously();
 133}
 134
 135// This method is currently unused
 136//static unsigned int __commandOutputAvailable(uint8_t handle) {
 137//  uint8_t cmd[] = {'o', handle};
 138//  uint8_t res[1];
 139//  Bridge.transfer(cmd, 2, res, 1);
 140//  return res[0];
 141//}
 142