c - C 中的 wait()。我应该传递什么参数给它

Question

我应该将什么参数传递给 wait() 以便它在继续之前等待所有子进程终止

Answer 1

wait 只等待一个 child 。您应该在循环中调用 wait(NULL) 直到它返回 -1 和 errno == ECHILD:

while (wait(NULL) != -1 || errno != ECHILD) { }

来自wait(2) manual page:

ECHILD (for wait())

The calling process does not have any unwaited-for children.

EINTR

WNOHANG was not set and an unblocked signal or a SIGCHLD was caught; see signal(7).

因此，您必须检查 ECHILD，以免被捕获的信号所愚弄。