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From: jsdy@hadron.UUCP (Joseph S. D. Yao)
Newsgroups: net.unix-wizards
Subject: Re: Conventional daemons
Message-ID: <364@hadron.UUCP>
Date: Tue, 8-Apr-86 01:03:21 EST
Article-I.D.: hadron.364
Posted: Tue Apr  8 01:03:21 1986
Date-Received: Thu, 10-Apr-86 01:22:17 EST
References: <2177@brl-smoke.ARPA> <44@rtgvax.UUCP>
Reply-To: jsdy@hadron.UUCP (Joseph S. D. Yao)
Organization: Hadron, Inc., Fairfax, VA
Lines: 15
Summary: Look at stdio.h

In article <44@rtgvax.UUCP> ksh@rtgvax.UUCP (Kent S. Harris) writes:
>In article <2177@brl-smoke.ARPA>, bzs%bostonu.csnet@csnet-relay.arpa (Barry Shein) writes:
>> The real question was, why open anything? Surely there's
>> nothing functionally useful about opening stdin/stdout on
>> "/" and it could be a potential hazard if ported.

>some hard coded constants reguarding fd's < 3 (I know the kernel doesn't
>give two hoots about particular fd's).  The idea is to close
>all fd's, open "/", and dup this fd to 1 and 2 so any new opens will
>be allocated fd's >= 3.

/usr/include/stdio.h:
#define	stdin	(&_iob[0])
#define	stdout	(&_iob[1])
#define	stderr	(&_iob[2])