daemonize the program

daemonize.c

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <signal.h>

int main(int argc, char *argv[])
{
    int i;
    pid_t pid;
    if(argc < 2)
    {
        printf("At least 2 arguments\n");
        return 0;
    }

    pid = fork();
    if(pid == 0)
    {
//        freopen("/dev/null","w",stdout);
        setsid();
        signal(SIGHUP,SIG_IGN);
        i = execv(argv[1], &argv[1]);
        if(i < 0)
            printf("Error of: %s\n",argv[1]);
        return 0;
    }
    printf("daemon pid: %d\n", pid);

    return 0;
}