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if i call sigaction at the beginning of my code,
sigaction(SIGPIPE, &pipe_act, NULL);
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?
It depends on whether or not your flags (
pipe_act->sa_flags) includeSA_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.