Re: UnLocking locks returned by CurrentDir()

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2 total messages Started by Anthon Pang Tue, 04 Dec 1990 20:43

#7220

Author: Anthon Pang
Date: Tue, 04 Dec 1990 20:43

8 lines
759 bytes

First of all, IMO, CurrentDir takes the old lock, frees it, and gives you a new
one.  Secondly, NULL isn't a valid lock value (returned by Lock, CurrentDir,
DupLock...)...it is used as a function parameter to specify the root directory
or system volume.

--
Disclaimer: just pulled an all nighter...so all of this is just MHO and
swiss-cheese memory.

Re: UnLocking locks returned by CurrentDir()

#7269

Author: Ken Farinsky - CATS
Date: Thu, 06 Dec 1990 15:07

42 lines
1879 bytes

In article <4046@mindlink.UUCP> a665@mindlink.UUCP (Anthon Pang) writes:
>First of all, IMO, CurrentDir takes the old lock, frees it, and gives you a new
>one.  Secondly, NULL isn't a valid lock value (returned by Lock, CurrentDir,
>DupLock...)...it is used as a function parameter to specify the root directory
>or system volume.

CurrentDir does not free anything.  NULL is a valid result.
When in doubt, consult the documentation:

dos.library/CurrentDir                                   dos.library/CurrentDir

    NAME
        CurrentDir -- Make a directory associated with a lock the working directory

    SYNOPSIS
        oldLock = CurrentDir( lock )
        D0                    D1

        struct FileLock *oldlock, *lock;

    FUNCTION
        CurrentDir() causes a directory associated with a lock to be made
        the current directory.  The old current directory lock is returned.

        A value of zero is a valid result here, this 0 lock represents the
        root of fiat you booted from (which is, in effect, the
        parent of all other file system roots.)

    INPUTS
        lock - BCPL pointer to a lock

    OUTPUTS
        oldLock - BCPL pointer to a lock

    SEE ALSO
        Lock

-- 
--
Ken Farinsky - CATS - (215) 431-9421 - Commodore Business Machines
uucp: ken@cbmvax.commodore.com   or  ...{uunet,rutgers}!cbmvax!ken
bix:  kfarinsky

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