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From: rang@cs.wisc.edu (Anton Rang)
Newsgroups: comp.unix.internals,comp.unix.programmer
Subject: Re: gets() during signal
Message-ID: <RANG.90Dec10164915@nexus.cs.wisc.edu>
Date: 10 Dec 90 21:49:15 GMT
References: <25232@adm.brl.mil>
Sender: news@msuinfo.cl.msu.edu
Followup-To: comp.unix.programmer
Organization: UW-Madison CS department
Lines: 15
In-Reply-To: stanonik@nprdc.navy.mil's message of 10 Dec 90 18:09:53 GMT

In article <25232@adm.brl.mil> stanonik@nprdc.navy.mil (Ron Stanonik) writes:
>I just ran into a problem while porting a program from 4.3bsd to
>sunos4.1.  The problem is that gets() in signal handlers seems to
>reset stdio's write pointer, but not the read pointer.

  As far as I know, UNIX stdio packages are not re-entrant.  Don't try
to use any of the input routines, in particular, inside a signal
handler.  I'm not sure if the output routines are safe, but I wouldn't
count on them--I've seen implementations of printf() which used a
static buffer internally.

  I've moved followups to comp.unix.programmer, which is probably
where this really belongs... (?)

	Anton
   
+---------------------------+------------------+-------------+
| Anton Rang (grad student) | rang@cs.wisc.edu | UW--Madison |
+---------------------------+------------------+-------------+