Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!uwvax!zazen!uakari.primate.wisc.edu!ames!lll-winken!uunet!bu.edu!bucsf.bu.edu!jdubb
From: jdubb@bucsf.bu.edu (jay dubb)
Newsgroups: comp.unix.programmer
Subject: EINTR on recvfrom() - how to block the signal?
Message-ID: <77135@bu.edu.bu.edu>
Date: 18 Mar 91 03:17:12 GMT
Sender: news@bu.edu.bu.edu
Distribution: usa
Organization: Computer Science Department, Boston University, Boston, MA, USA
Lines: 14
Originator: jdubb@bucsf.bu.edu


   I am posting this for a friend of mine who doesn't have access
to USENET, so please respond directly to mlevin@jade.tufts.edu.

   I have recvfrom() call in my code that attempts to read a UDP
socket message, and is returning -1 and setting errno to EINTR -
interrupted system call (as far as I can tell, this is the signal
caused by one of the child processes dying). What exactly does an
interrupted recvfrom() do?  Can I temporarily disable signal delivery
around the call (but making sure the signal is delivered after the
call completes)? If so, is this a good idea, provided I want to catch
the message, and the signal also? If not, what should I do? Thanks in
advance. 
				Mike Levin (mlevin@jade.tufts.edu)