使用Vim编辑器，熟练Linux创建进程fork操作，在服务器上编写一个程序实现一个进程创建两个子进程，并查看进程树，C语言代码具体实现

以下是实现一个进程创建两个子进程的C语言代码：

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

int main() {
    pid_t pid1, pid2;

    // 创建第一个子进程
    pid1 = fork();

    if (pid1 == -1) {
        printf("Failed to create first child process.\n");
        exit(1);
    } else if (pid1 == 0) {
        // 子进程1中执行的代码
        printf("This is the first child process with PID %d.\n", getpid());
        exit(0);
    } else {
        // 在父进程中创建第二个子进程
        pid2 = fork();

        if (pid2 == -1) {
            printf("Failed to create second child process.\n");
            exit(1);
        } else if (pid2 == 0) {
            // 子进程2中执行的代码
            printf("This is the second child process with PID %d.\n", getpid());
            exit(0);
        } else {
            // 父进程中执行的代码
            printf("This is the parent process with PID %d.\n", getpid());
            printf("The first child process has PID %d.\n", pid1);
            printf("The second child process has PID %d.\n", pid2);
            exit(0);
        }
    }

    return 0;
}

运行这个程序后，可以使用`pstree`命令查看进程树，如下所示：

$ ./a.out
This is the first child process with PID 1234.
This is the second child process with PID 1235.
This is the parent process with PID 1233.
The first child process has PID 1234.
The second child process has PID 1235.

$ pstree -p
├─sshd(864)─┬─sshd(1265)───bash(1266)───a.out(1233)─┬─a.out(1234)
│           │                                        ├─a.out(1235)
│           │                                        └─pstree(1281)
│           └─sshd(1271)───sshd(1272)───bash(1273)
...

可以看到，父进程1233下面有两个子进程1234和1235。