[BusyBox 0001108]: Implement flock

[bugs at busybox.net]

A NOTE has been added to this issue. 
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http://busybox.net/bugs/view.php?id=1108 
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Reported By:                eswierk
Assigned To:                BusyBox
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Project:                    BusyBox
Issue ID:                   1108
Category:                   New Features
Reproducibility:            always
Severity:                   feature
Priority:                   normal
Status:                     assigned
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Date Submitted:             12-01-2006 11:40 PST
Last Modified:              12-01-2006 11:58 PST
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Summary:                    Implement flock
Description: 
I've ported H. Peter Anvin's flock implementation
(http://directory.fsf.org/All/flock.html) to BusyBox.  This utility is
handy for implementing mutual exclusion in shell scripts.

The attached patch is a rough first draft.  It works, but segfaults if the
fd# argument is missing.  I would appreciate suggestions for improvements,
especially for making option processing and usage more BusyBox-like.

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---------------------------------------------------------------------- 
 eswierk - 12-01-06 11:58  
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I just noticed that my Fedora system has another implementation of flock,
from util-linux.  The usage is completely different from the hpa
implementation, and since it's probably in much more widespread usage,
I'll port this one to BusyBox instead. 

Issue History 
Date Modified   Username       Field                    Change               
====================================================================== 
12-01-06 11:40  eswierk        New Issue                                    
12-01-06 11:40  eswierk        Status                   new => assigned     
12-01-06 11:40  eswierk        Assigned To               => BusyBox         
12-01-06 11:40  eswierk        File Added: busybox-200-flock.patch              
     
12-01-06 11:41  eswierk        Issue Monitored: eswierk                     
12-01-06 11:58  eswierk        Note Added: 0001851                          
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