/usr/share/doc/libglibmm-2.4-dev/examples/iochannel_stream/main.cc is in libglibmm-2.4-doc 2.56.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 | /* Copyright (C) 2004 The glibmm Development Team
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include <fcntl.h>
#include <glibmm.h>
#include <iostream>
#include <limits.h>
#include <string>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "fdstream.h"
fdstream input_stream;
Glib::RefPtr<Glib::MainLoop> mainloop;
/*
send to the fifo with:
echo "Hello" > testfifo
quit the program with:
echo "Q" > testfifo
*/
// this will be our signal handler for read operations
// it will print out the message sent to the fifo
// and quit the program if the message was, or began
// with, 'Q'
bool
MyCallback(Glib::IOCondition io_condition)
{
if ((io_condition & Glib::IO_IN) == 0)
{
std::cerr << "Invalid fifo response" << std::endl;
}
else
{
// stream for stdout (does the same as std::cout
// - this is an example of using fdstream for output)
fdstream out(1, false);
std::string text;
input_stream >> text;
out << text << std::endl;
if (text[0] == 'Q')
mainloop->quit();
}
return true;
}
int main(/* int argc, char *argv[] */)
{
Glib::init();
// the usual Glib::Main object
mainloop = Glib::MainLoop::create();
if (access("testfifo", F_OK) == -1)
{
// fifo doesn't exit - create it
if (mkfifo("testfifo", 0666) != 0)
{
std::cerr << "error creating fifo" << std::endl;
return -1;
}
}
const auto read_fd = open("testfifo", O_RDONLY);
if (read_fd == -1)
{
std::cerr << "error opening fifo" << std::endl;
return -1;
}
input_stream.attach(read_fd);
input_stream.connect(sigc::ptr_fun(MyCallback), Glib::IO_IN);
// and last but not least - run the application main loop
mainloop->run();
// now remove the temporary fifo
if (unlink("testfifo"))
std::cerr << "error removing fifo" << std::endl;
return 0;
}
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