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// file : bbot/agent.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <signal.h> // signal()
#include <unistd.h> // sleep()
#include <iostream>
#include <butl/pager>
#include <bbot/types>
#include <bbot/utility>
#include <bbot/diagnostics>
#include <bbot/agent-options>
using namespace std;
using namespace butl;
using namespace bbot;
extern "C" void
handle_signal (int sig)
{
switch (sig)
{
case SIGHUP: exit (3); // Unimplemented feature.
case SIGTERM: exit (0);
default: assert (false);
}
}
int
main (int argc, char* argv[])
try
{
// Map to systemd severity prefixes (see sd-daemon(3) for details). Note
// that here we assume we will never have location (like file name which
// would end up being before the prefix).
//
const char indent[] = "\xE2\x86\xB2\n"; // Right arrow followed by newline.
trace_indent =
fail.indent_ =
error.indent_ =
warn.indent_ =
info.indent_ =
text.indent_ = indent;
fail.type_ = "<3>";
error.type_ = "<3>";
warn.type_ = "<4>";
info.type_ = "<6>";
trace_type = "<7>";
tracer trace ("main");
// On POSIX ignore SIGPIPE which is signaled to a pipe-writing process if
// the pipe reading end is closed. Note that by default this signal
// terminates a process. Also note that there is no way to disable this
// behavior on a file descriptor basis or for the write() function call.
//
if (signal (SIGPIPE, SIG_IGN) == SIG_ERR)
fail << "unable to ignore broken pipe (SIGPIPE) signal: "
<< system_error (errno, generic_category ()); // Sanitize.
// Handle SIGHUP and SIGTERM.
//
if (signal (SIGHUP, &handle_signal) == SIG_ERR ||
signal (SIGTERM, &handle_signal) == SIG_ERR)
fail << "unable to set signal handler: "
<< system_error (errno, generic_category ()); // Sanitize.
cli::argv_scanner scan (argc, argv, true);
agent_options ops (scan);
// Version.
//
if (ops.version ())
{
cout << "bbot-agent " << BBOT_VERSION_STR << endl
<< "libbbot " << LIBBBOT_VERSION_STR << endl
<< "libbutl " << LIBBUTL_VERSION_STR << endl
<< "Copyright (c) 2014-2017 Code Synthesis Ltd" << endl
<< "MIT; see accompanying LICENSE file" << endl;
return 0;
}
// Help.
//
if (ops.help ())
{
pager p ("bbot-agent help", false);
print_bbot_agent_usage (p.stream ());
// If the pager failed, assume it has issued some diagnostics.
//
return p.wait () ? 0 : 1;
}
for (;;)
{
error << "sleeping" <<
warn << "lightly";
sleep (10);
}
}
catch (const failed&)
{
return 1; // Diagnostics has already been issued.
}
catch (const cli::exception& e)
{
error << e;
return 1;
}
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