sigaction:恢复处理程序与否? [英] sigaction: restore handler or not?

问题描述

如果我在代码的开头调用 sigaction，

if i call sigaction at the beginning of my code,

sigaction(SIGPIPE, &pipe_act, NULL);

如果我收到 sigpipe，在执行 pipe_act 后，安装的处理程序仍然是 pipe_Act，还是自动为 sigpipe 设置了默认处理程序?

if i receive sigpipe, after the execution of pipe_act the handler installed remains pipe_Act, or the default handler is automatically set for sigpipe?

推荐答案

这取决于您的标志 (pipe_act->sa_flags) 是否包含 SA_RESETHAND.如果是，则信号处理程序是一次性"并在被调用后被删除(即处理程序被重置为默认处理程序)，但如果不是，则处理程序保持原位，直到您手动更改它.

It depends on whether or not your flags (pipe_act->sa_flags) include SA_RESETHAND. If yes, then the signal handler is a "one-shot" and gets removed after having been called (i.e. the handler is reset to the default handler), but if not, then the handler remains in place until you change it manually.

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