Elysian Shadows

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/*
	File:        lifeping.c
	Description: This application tells a set server (192.168.1.20) at certain intervals that
		     it is indeed still alive.
	Interval:    About 5 minutes
	Port:        2024
	Protocol:    <connect>, send identification code, send status, <terminate>
*/

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <fcntl.h>
#include <string.h>

#define ID_BILL 0
#define ID_JACOB 1

#define ID ID_BILL

int check_status();

int main(int argc, char* argv[]) {
	//...
}

int check_status() {
	int val = fork();

	int fd = open("status.tmp", O_CREAT | O_RDWR | O_TRUNC);
	if(fd < 0) {
		fprintf(stderr, "Couldn't open file!\n");
	}

	if(val == 0) {
		if(dup2(fd, STDOUT_FILENO) < 0) fprintf(stderr, "dup2 failed\n");
		int val = execve("../isup.sh", NULL, NULL);
		fprintf(stderr, "Something has gone horribly wrong, exec has returned!\n");
	} else {
		int status;
		waitpid(-1, &status, 0);
		if(status != 0) {
			fprintf(stderr, "Something has gone wrong checking status!\n");
		}
	}

	close(fd);
	return -1;
}