File size: 3,213 Bytes
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Copyright (c) 2013 Arduino LLC. All right reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <Process.h>
Process::~Process() {
close();
}
size_t Process::write(uint8_t c) {
uint8_t cmd[] = {'I', handle, c};
bridge.transfer(cmd, 3);
return 1;
}
void Process::flush() {
}
int Process::available() {
// Look if there is new data available
doBuffer();
return buffered;
}
int Process::read() {
doBuffer();
if (buffered == 0)
return -1; // no chars available
else {
buffered--;
return buffer[readPos++];
}
}
int Process::peek() {
doBuffer();
if (buffered == 0)
return -1; // no chars available
else
return buffer[readPos];
}
void Process::doBuffer() {
// If there are already char in buffer exit
if (buffered > 0)
return;
// Try to buffer up to 32 characters
readPos = 0;
uint8_t cmd[] = {'O', handle, sizeof(buffer)};
buffered = bridge.transfer(cmd, 3, buffer, sizeof(buffer));
}
void Process::begin(const String &command) {
close();
cmdline = new String(command);
}
void Process::addParameter(const String ¶m) {
*cmdline += "\xFE";
*cmdline += param;
}
void Process::runAsynchronously() {
uint8_t cmd[] = {'R'};
uint8_t res[2];
bridge.transfer(cmd, 1, (uint8_t*)cmdline->c_str(), cmdline->length(), res, 2);
handle = res[1];
delete cmdline;
cmdline = NULL;
if (res[0] == 0) // res[0] contains error code
started = true;
}
boolean Process::running() {
uint8_t cmd[] = {'r', handle};
uint8_t res[1];
bridge.transfer(cmd, 2, res, 1);
return (res[0] == 1);
}
unsigned int Process::exitValue() {
uint8_t cmd[] = {'W', handle};
uint8_t res[2];
bridge.transfer(cmd, 2, res, 2);
return (res[0] << 8) + res[1];
}
unsigned int Process::run() {
runAsynchronously();
while (running())
delay(100);
return exitValue();
}
void Process::close() {
if (started) {
uint8_t cmd[] = {'w', handle};
bridge.transfer(cmd, 2);
}
started = false;
}
unsigned int Process::runShellCommand(const String &command) {
runShellCommandAsynchronously(command);
while (running())
delay(100);
return exitValue();
}
void Process::runShellCommandAsynchronously(const String &command) {
begin("/bin/ash");
addParameter("-c");
addParameter(command);
runAsynchronously();
}
// This method is currently unused
//static unsigned int __commandOutputAvailable(uint8_t handle) {
// uint8_t cmd[] = {'o', handle};
// uint8_t res[1];
// Bridge.transfer(cmd, 2, res, 1);
// return res[0];
//}
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