#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <signal.h>
#include <string.h>
#include <stdbool.h>

bool daemonize()
{
    pid_t pid = fork();
    if (pid < 0)
    {
        return false;
    }
    if (pid > 0)
    {
        exit(0);
    }
    if (setsid() < 0)
    {
        return false;
    }
    pid = fork();
    if (pid < 0)
    {
        return false;
    }
    if (pid > 0)
    {
        exit(0);
    }
    umask(0);
    chdir("/");
    FILE *fp;
    fp = fopen("/Users/mdy/Development/langage_C/System2/daemonize/test.txt", "w");
    close(STDIN_FILENO);
    close(STDOUT_FILENO);
    dup(fileno(fp));
    close(STDERR_FILENO);
    dup(fileno(fp));
    return true;
}

void handler(int signum)
{
    if (signum == SIGUSR1)
    {
        FILE *fp;
        fp = fopen("/Users/mdy/Development/langage_C/System2/daemonize/coucou.txt", "w");
        fprintf(fp, "coucou, je suis bien en vie!\n");
        fclose(fp);
    }
    else if (signum == SIGUSR2)
    {
        exit(EXIT_SUCCESS);
    }
    else
    {
        printf("received signal %d\n", signum);
    }
}

int main(void)
{
    daemonize();
    if (signal(SIGUSR1, handler) == SIG_ERR)
        printf("can't catch SIGUSR1\n");
    if (signal(SIGUSR2, handler) == SIG_ERR)
        printf("can't catch SIGUSR2\n");
    for (;;)
        pause();
}