检查 wait() 是否失败

Question

为了知道 wait() 是否起作用，像下面这样检查是否正确？理论上，如果wait()没有失败，应该return给父进程结束的子进程pid，否则父进程pid就是1吧？

switch (process = fork())
{
    case -1:
        // Fork fail
        perror("Fork failed");
        exit(EXIT_FAILURE);

    case 0:
        //Child process
        HERE CODE DOES SOMETHING
        exit(EXIT_SUCCESS);
    default:
        //Parent process 
        pid=wait(&status);

        if(pid==1){
            perror("Wait failed");
        }else{
        exit(EXIT_SUCCESS);
        }
}

Answer 1

引用 man 2 wait:

RETURN VALUE

wait(): on success, returns the process ID of the terminated child; on error, -1 is returned.

所以要检查 wait(2) 是否失败，这应该足够了：

if (wait(&status) == -1) {
    perror("wait failed");
    exit(1);
}

检查 wait() 是否失败

Checking if wait() failed

c

linux

wait

waitpid