linux中wait()用法

pid_t wait(int *status);

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

int main() {
    pid_t child_pid;

    // 创建子进程
    child_pid = fork();

    if (child_pid == 0) { // 子进程
        printf("Child process: PID = %d\n", getpid());
        exit(0); // 子进程退出
    } else if (child_pid > 0) { // 父进程
        int status;
        wait(&status); // 等待子进程结束
        printf("Parent process: Child with PID %d has finished.\n", child_pid);
        if (WIFEXITED(status)) {
            printf("Child process exited with status %d\n", WEXITSTATUS(status));
        }
    } else { // fork失败
        perror("fork");
        exit(EXIT_FAILURE);
    }

    return 0;
}

pid_t result = waitpid(-1, &status, WNOHANG);
if (result == 0) {
    // 没有子进程退出
} else if (result < 0) {
    // 错误处理
}