创建新进程时系统调用被阻塞(程序不会结束)

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

int main() {
    pid_t pid = fork();
    if (pid == 0) { // 子进程
        // 执行子进程任务
        exit(0);
    } else if (pid > 0) { // 父进程
        int status;
        wait(&status); // 等待子进程结束
        if (WIFEXITED(status)) {
            printf("Child process exited with status %d\n", WEXITSTATUS(status));
        }
    } else {
        perror("fork");
    }
    return 0;
}

#include <sys/time.h>

struct timeval timeout;
timeout.tv_sec = 5; // 5秒超时
timeout.tv_usec = 0;

if (waitpid(pid, &status, WNOHANG) == 0) {
    select(0, NULL, NULL, NULL, &timeout);
    if (waitpid(pid, &status, WNOHANG) == 0) {
        printf("Child process did not finish in time\n");
    }
}

#include <signal.h>

signal(SIGCHLD, SIG_IGN);