haha4.c

haha4.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <syslog.h>

static void start_skeleton_daemon()
{
  pid_t pid;

  /* Fork off the parent process */
  pid = fork();

  /* An error occurred */
  if (pid < 0)
    exit(EXIT_FAILURE);

  /* Success: Let the parent terminate */
  if (pid > 0)
    exit(EXIT_SUCCESS);

  /* On success: The child process becomes session leader */
  if (setsid() < 0)
    exit(EXIT_FAILURE);

  /* Catch, ignore and handle signals */
  //TODO: Implement a working signal handler */
  signal(SIGCHLD, SIG_IGN);
  signal(SIGHUP, SIG_IGN);

  /* Fork off for the second time*/
  pid = fork();

  /* An error occurred */
  if (pid < 0)
    exit(EXIT_FAILURE);

  /* Success: Let the parent terminate */
  if (pid > 0)
    exit(EXIT_SUCCESS);

  /* Set new file permissions */
  umask(0);

  /* Change the working directory to the root directory */
  /* or another appropriated directory */
  chdir("/");

  /* Close all open file descriptors */
  int x;
  for (x = sysconf(_SC_OPEN_MAX); x>=0; x--)
    {
      close (x);
    }

  /* Open the log file */
  openlog ("puzzle_daemon", LOG_PID, LOG_DAEMON);
}

// TODO: write real codes. :)
int daemon_main()
{
  while (1)
    {
      syslog (LOG_NOTICE, "Puzzle daemon started.");
      usleep(2*1000*1000);
    }

  return EXIT_SUCCESS;
}

int main()
{
  int ret;

  start_skeleton_daemon();

  syslog (LOG_NOTICE, "Puzzle daemon started.");

  ret = daemon_main();

  syslog (LOG_NOTICE, "Puzzle daemon terminated.");
  closelog();

  return ret;
}


///////////////////////////////


CC = arm-none-linux-gnueabi-gcc
OUT = puzzle_daemon
SRC = $(OUT).c

all: $(OUT)

$(OUT): $(SRC)
	$(CC) -static $(SRC) -o $(OUT)

clear:
	rm -rf $(OUT)