No Inherit Flag

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Article #8538

#8538

From: Ian Stewartson
Date: Wed, 13 Dec 1989 12:29

20 lines
1257 bytes

Does anyone know how to modify the No Inherit flag for a file handler.  The
flag can be set via the MSDOS Open system call (int 0x21, AH = 0x3d,
AL=0x80) and this flag is transfered on dup and dup2.  If set, the file is
auto-closed by MSDOS on exec or spawn.  However, there appears to be no way
of testing, clearing or setting the bit on an already open file.

If anyone can give me any information about testing, clearing or setting this
bit, I would be very grateful.

I noted in passing that the Microsoft C V5.1 library open always clears
this bit, even though it is defined in the fcntl.h header file.  A quick
patch resolved that problem.

Thanks,

Ian Stewartson
Data Logic Ltd, Queens House, Greenhill Way, Harrow, Middlesex, HA1 1YR, UK.
(Phone) +44 1 863 0383 (Telex) 888103 (Fax) +44 1 861 2010
	+44 81 863 0383 after May 1990.
(Network) gis@datlog.co.uk or ukc!datlog!gis

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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!ukc!stc!datlog!gis
From: gis@datlog.co.uk ( Ian Stewartson )
Newsgroups: comp.sys.ibm.pc
Subject: No Inherit Flag
Message-ID: <2365@dlvax2.datlog.co.uk>
Date: 13 Dec 89 12:29:25 GMT
Organization: Data Logic Ltd, Queens House, Greenhill Way, Harrow, London.
Lines: 20