深入理解C语言wait系统调用与子进程退出状态解析

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h> // 包含wait相关的宏和函数

int main() {
    pid_t pid;
    int status; // 用于存储子进程的退出状态信息
    char *golang_program_path = "./golang_process"; // 假设Go程序已编译为golang_process
    char *args[] = {golang_program_path, NULL};

    pid = fork();

    if (pid == -1) {
        perror("fork failed");
        return 1;
    } else if (pid == 0) {
        // 子进程逻辑
        printf("Child process (PID: %d) is executing Go program: %s\n", getpid(), golang_program_path);
        execv(golang_program_path, args);
        // 如果execv返回，说明执行失败
        perror("execv failed");
        _exit(127); // 使用_exit在子进程中退出，避免刷新缓冲区
    } else {
        // 父进程逻辑
        printf("Parent process (PID: %d) waiting for child %d...\n", getpid(), pid);
        wait(&status); // 父进程等待子进程终止
        // ... 此处将解析status ...
    }
    return 0;
}

package main

import (
    "fmt"
    "os"
    "time" // 引入time包用于模拟工作

)

func main() {
    fmt.Println("Golang process started. Simulating work then exiting.")
    time.Sleep(2 * time.Second) // 模拟程序执行一些任务

    // 假设程序因某种错误而退出，并返回退出码3
    exitCode := 3
    fmt.Printf("Golang process exiting with status: %d\n", exitCode)
    os.Exit(exitCode)
}

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h> // 包含wait相关的宏和函数

int main() {
    pid_t pid;
    int status;
    char *golang_program_path = "./golang_process";
    char *args[] = {golang_program_path, NULL};

    pid = fork();

    if (pid == -1) {
        perror("fork failed");
        return 1;
    } else if (pid == 0) {
        printf("Child process (PID: %d) is executing Go program: %s\n", getpid(), golang_program_path);
        execv(golang_program_path, args);
        perror("execv failed");
        _exit(127);
    } else {
        printf("Parent process (PID: %d) waiting for child %d...\n", getpid(), pid);
        wait(&status); // 父进程等待子进程终止

        if (WIFEXITED(status)) {
            // 子进程正常退出
            printf("Child process %d exited normally with status: %d\n", pid, WEXITSTATUS(status));
        } else if (WIFSIGNALED(status)) {
            // 子进程被信号终止
            printf("Child process %d terminated by signal: %d\n", pid, WTERMSIG(status));
        } else if (WIFSTOPPED(status)) {
            // 子进程被信号停止
            printf("Child process %d stopped by signal: %d\n", pid, WSTOPSIG(status));
        } else {
            // 其他异常终止情况
            printf("Child process %d terminated abnormally.\n", pid);
        }
    }
    return 0;
}

Parent process (PID: XXXX) waiting for child YYYY...
Child process (PID: YYYY) is executing Go program: ./golang_process
Golang process started. Simulating work then exiting.
Golang process exiting with status: 3
Child process YYYY exited normally with status: 3