linux 守护进程 c

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

void daemonize(void) {
    pid_t pid;

    // Fork off the parent process
    pid = fork();
    if (pid < 0) {
        exit(EXIT_FAILURE);
    }
    if (pid > 0) {
        exit(EXIT_SUCCESS);
    }

    // Create a new session and set the process group ID
    if (setsid() < 0) {
        exit(EXIT_FAILURE);
    }

    // Change the current working directory to root
    if (chdir("/") < 0) {
        exit(EXIT_FAILURE);
    }

    // Set file permissions mask
    umask(0);

    // Close standard file descriptors
    close(STDIN_FILENO);
    close(STDOUT_FILENO);
    close(STDERR_FILENO);

    // Open /dev/null to redirect stdin, stdout, and stderr
    open("/dev/null", O_RDONLY);
    open("/dev/null", O_RDWR);
    open("/dev/null", O_RDWR);
}

int main(void) {
    daemonize();

    // Your daemon code here
    while (1) {
        // Perform some task
        sleep(1);
    }

    return 0;
}