Path: utzoo!utgpu!water!watmath!clyde!att!att-ih!pacbell!ames!umd5!mimsy!chris
From: chris@mimsy.UUCP (Chris Torek)
Newsgroups: comp.unix.wizards
Subject: Re: Redirect Output in the Middle of a Program??
Message-ID: <11257@mimsy.UUCP>
Date: 28 Apr 88 10:13:22 GMT
References: <13085@brl-adm.ARPA> <3571@gryphon.CTS.COM> <2841@cvl.umd.edu> <62@denali.UUCP>
Organization: U of Maryland, Dept. of Computer Science, Coll. Pk., MD 20742
Lines: 13

In article <62@denali.UUCP> karish@denali.UUCP (karish) writes:
>... The user's program can catch the SIGHUP, using a signal handler
>assigned by the signal() function.  This handler can use fopen() to
>open outfiles, and freopen() to reassign the output streams.

This is quite dangerous.  The proposed technique is likely to work
until you need it to do so.  A SIGHUP can occur while all sorts of
internal states are inconsistent; opening a new stream, or reopening an
existing one, is liable to result in a core dump or lost or duplicated
output.
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7163)
Domain:	chris@mimsy.umd.edu	Path:	uunet!mimsy!chris