flock

Section: User Commands (1)
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Name

flock, funlock - Provide single user access to a file(s)

Syntax

flock files ...

funlock files ...

Description

For processes using this pair of routines, flock/funlock provide a way of serialising access to a file. Flock tries to create a file with a name derived from the target, and waits until it is successful. Funlock removes this "lock" file, allowing waiting "flock"s to continue.

Arguments

files - a list of files to be locked. These are processed in order, so there is no deadlock problem.

Example

$ flock libcitr.a
$ ar libcitr.a xxxx.o
$ funlock libcitr.a

Environment

PATH=$PATH:/home/joppa/fastpac/bin/{HPPA,RISC}

MANPATH=$MANPATH:/home/joppa/fastpac/release_2/doc/60.Manuals

Known Bugs

If a makefile using flock is interrupted, the lock file remains, and thus must be manually released.

Write access is required to the directory where the target file is.

Author

David Horton - CiTR

Copyright

Centre for Information Technology Research, 1993

This document was created by man2html, using the manual pages.
Time: 23:34:46 GMT, September 27, 2019