c - 为什么“暂停”系统调用总是返回-1？

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7年前关闭。
或者，为什么我们不能简单地声明暂停为：

#include <unistd.h>
void pause(void);

因为pause的返回值没有意义。

最佳答案

从man page of pause

RETURN VALUE

   pause()  only  returns when a signal was caught and the signal-catching
   function returned.  In this case pause() returns -1, and errno  is  set
   to EINTR.

每个被中断的系统调用都会得到EINTR（在特殊情况下是ERESTART）我认为没有理由让pause成为一个例外！
当然，您可以在代码中编写(void) pause ();来忽略结果。

关于c - 为什么“暂停”系统调用总是返回-1？ ，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/8255107/