103 lines
2.5 KiB
C++
103 lines
2.5 KiB
C++
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/* Copyright (C) 2004 The glibmm Development Team
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*
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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 Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <glibmm.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <limits.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <iostream>
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#include <string>
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#include "fdstream.h"
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fdstream input_stream;
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Glib::RefPtr<Glib::MainLoop> mainloop;
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/*
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send to the fifo with:
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echo "Hello" > testfifo
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quit the program with:
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echo "Q" > testfifo
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*/
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// this will be our signal handler for read operations
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// it will print out the message sent to the fifo
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// and quit the program if the message was, or began
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// with, 'Q'
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bool MyCallback(Glib::IOCondition io_condition)
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{
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if ((io_condition & Glib::IO_IN) == 0)
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{
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std::cerr << "Invalid fifo response" << std::endl;
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}
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else
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{
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// stream for stdout (does the same as std::cout
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// - this is an example of using fdstream for output)
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fdstream out(1, false);
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std::string text;
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input_stream >> text;
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out << text << std::endl;
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if (text[0] == 'Q')
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mainloop->quit();
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}
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return true;
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}
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int main( /* int argc, char *argv[] */)
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{
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Glib::init();
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// the usual Glib::Main object
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mainloop = Glib::MainLoop::create();
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if(access("testfifo", F_OK) == -1)
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{
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// fifo doesn't exit - create it
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if (mkfifo("testfifo", 0666) != 0)
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{
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std::cerr << "error creating fifo" << std::endl;
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return -1;
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}
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}
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int read_fd = open("testfifo", O_RDONLY);
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if(read_fd == -1)
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{
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std::cerr << "error opening fifo" << std::endl;
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return -1;
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}
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input_stream.attach(read_fd);
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input_stream.connect(sigc::ptr_fun(MyCallback), Glib::IO_IN);
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// and last but not least - run the application main loop
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mainloop->run();
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// now remove the temporary fifo
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if(unlink("testfifo"))
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std::cerr << "error removing fifo" << std::endl;
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return 0;
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}
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