linux fork 多个进程

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

void child_process(int id) {
    printf("Child process %d with PID %d\n", id, getpid());
}

int main() {
    int num_processes = 5;
    pid_t pid;

    for (int i = 0; i < num_processes; i++) {
        pid = fork();
        if (pid == 0) { // 子进程
            child_process(i);
            exit(0);
        } else if (pid > 0) { // 父进程
            printf("Parent process created child with PID %d\n", pid);
        } else { // fork失败
            perror("fork");
            exit(1);
        }
    }

    // 等待所有子进程结束
    for (int i = 0; i < num_processes; i++) {
        wait(NULL);
    }

    printf("All child processes have finished.\n");
    return 0;
}