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Path: utzoo!linus!decvax!harpo!utah-cs!utah-gr!thomas
From: thomas@utah-gr.UUCP (Spencer W. Thomas)
Newsgroups: net.unix-wizards
Subject: Re: problems with sigset, sighold and sigrelse.
Message-ID: <865@utah-gr.UUCP>
Date: Sat, 6-Aug-83 00:22:42 EDT
Article-I.D.: utah-gr.865
Posted: Sat Aug  6 00:22:42 1983
Date-Received: Sat, 6-Aug-83 10:45:49 EDT
References: psuvax.185
Lines: 19


	Right now, I'm trying something like this:
	
	sigset(SIGINT, fn);
	sighold(SIGINT);
	...	some code with writes in it
	sigrelse(SIGINT);

	Even with this code, some write operation gets interrupted and does not
	return normally (# of bytes attempted != # actually written).

This is clearly a confusing situation.  What the sighold/sigrelse pair
guarantee you is that the write will have actually written as many
characters as it said it did.  It may only do a partial write, though.
Without the sighold/sigrelse pair, the write might say that it had
written 100 characters, while it had actually written only 47.  This is
clearly much harder to recover from.

=Spencer