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