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/*
Copyright (C) 2009 Jiri Moskovcak (jmoskovc@redhat.com)
Copyright (C) 2009 RedHat inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "CrashWatcher.h"
#include "ABRTException.h"
#include <iostream>
#include <cstdio>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
uint8_t sig_caught;
static void handle_fatal_signal(int signal)
{
sig_caught = signal;
}
CCrashWatcher *g_pCrashWatcher = NULL;
void print_help()
{
}
int main(int argc, char** argv)
{
int daemonize = 1;
/* signal handlers */
signal(SIGTERM, handle_fatal_signal);
signal(SIGINT, handle_fatal_signal);
try
{
if (argv[1])
{
if (strcmp(argv[1], "-d") == 0)
{
daemonize = 0;
}
}
if (daemonize)
{
/* Open stdin to /dev/null. We do it before forking
* in order to emit useful exitcode to the parent
* if open fails */
close(STDIN_FILENO);
if (open("/dev/null", O_RDWR))
{
throw CABRTException(EXCEP_FATAL, "Can't open /dev/null");
}
/* forking to background */
pid_t pid = fork();
if (pid < 0)
{
throw CABRTException(EXCEP_FATAL, "CCrashWatcher::Daemonize(): Fork error");
}
if (pid > 0)
{
/* Parent */
/* Wait for child to notify us via SIGTERM that it feels ok */
int i = 20; /* 2 sec */
while (sig_caught == 0 && --i)
{
usleep(100 * 1000);
}
_exit(sig_caught != SIGTERM); /* TERM:ok (0), anything else: bad (1) */
}
/* Child (daemon) continues */
pid_t sid = setsid();
if(sid == -1)
{
throw CABRTException(EXCEP_FATAL, "CCrashWatcher::Daemonize(): setsid failed");
}
/* We must not leave fds 0,1,2 closed.
* Otherwise fprintf(stderr) dumps messages into random fds, etc. */
close(STDOUT_FILENO);
close(STDERR_FILENO);
dup(0);
dup(0);
}
g_pCrashWatcher = new CCrashWatcher(DEBUG_DUMPS_DIR);
if (daemonize)
{
/* Let parent know we initialized ok */
kill(getppid(), SIGTERM);
}
g_pCrashWatcher->Run();
}
catch(CABRTException& e)
{
std::cerr << "Cannot create daemon: " << e.what() << std::endl;
}
catch(std::exception& e)
{
std::cerr << "Cannot create daemon: " << e.what() << std::endl;
}
delete g_pCrashWatcher;
/* Take care to emit correct exit status */
if (sig_caught) {
signal(sig_caught, SIG_DFL);
raise(sig_caught);
}
/* I think we never end up here */
return 0;
}
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