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/**
* @file
* @section AUTHORS
*
* Authors:
* Eamon Walsh <ewalsh@tycho.nsa.gov>
*
* @section LICENSE
*
* This file is in the public domain.
*
* @section DESCRIPTION
*
* This is the main routine for the linpicker-monitor program.
* Nothing much here except initialization, select loop, and teardown.
*/
#include <sys/types.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <errno.h>
#include "common.h"
#include "fd.h"
#include "xen_backend.h"
#include "sys-queue.h"
extern int xenfb_monitor_init(void);
static int timetodie;
/*
* Is called in case of process signals.
*/
static void
monitor_sighandler(int sig)
{
timetodie = 1;
}
static int
monitor_fork(void)
{
int pipefd[2];
pid_t pid;
char tmp;
if (chdir("/") < 0)
exit(1);
if (pipe(pipefd) < 0)
exit(1);
pid = fork();
if (pid < 0)
exit(5);
if (pid > 0) {
close(pipefd[1]);
while (read(pipefd[0], &tmp, 1) != 0);
exit(0);
}
close(pipefd[0]);
return pipefd[1];
}
/*
* Main
*/
int main (int argc, char *argv[])
{
struct sigaction sa = { .sa_handler = monitor_sighandler };
int writefd;
/* Fork and wait in the parent */
writefd = monitor_fork();
/* Set up sighandlers */
sigaction(SIGINT, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
/* Open logfile */
if (fd_open_logfile(MONITOR_LOG) < 0)
return 1;
/* Initialize subsystems */
if (xen_be_init() < 0)
return 1;
if (xenfb_monitor_init() < 0)
return 2;
/* Signal the parent process to exit */
close(writefd);
/* Enter select loop */
while (!timetodie && fd_run_select() == 0);
/* Shut down */
fd_shutdown();
return 0;
}
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