08-21-2002
If you only read file, you should not worry about file locking and
accessing -- OS will take care of it. Anyway, when you write to the file from shell it is no reliable way from the OS point to determine, that all writes are done.
You can accomplish this programmatically: main shell create a flag file at the end of all writes, and subshell delete this flag file, as soon as it finished it's own processing.
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LEARN ABOUT REDHAT
shlock
SHLOCK(1) General Commands Manual SHLOCK(1)
NAME
shlock - create lock files for use in shell scripts
SYNOPSIS
shlock -p pid -f name [ -b ] [ -u ] [ -c ]
DESCRIPTION
Shlock tries to create a lock file named name and write the process ID pid into it. If the file already exists, shlock will read the
process ID from the file and test to see if the process is currently running. If the process exists, then the file will not be created.
Shlock exits with a zero status if it was able to create the lock file, or non-zero if the file refers to currently-active process.
OPTIONS
-b Process IDs are normally read and written in ASCII. If the ``-b'' flag is used, then they will be written as a binary int. For
compatibility with other systems, the ``-u'' flag is accepted as a synonym for ``-b'' since binary locks are used by many UUCP pack-
ages.
-c If the ``-c'' flag is used, then shlock will not create a lock file, but will instead use the file to see if the lock is held by
another program. If the lock is valid, the program will exit with a non-zero status; if the lock is not valid (i.e., invoking
shlock without the flag would have succeeded), then the program will exit with a zero status.
EXAMPLES
The following example shows how shlock would be used within a shell script:
LOCK=<pathrun in inn.conf>/LOCK.send
trap 'rm -f ${LOCK} ; exit 1' 1 2 3 15
if shlock -p $$ -f ${LOCK} ; then
# Do appropriate work
else
echo Locked by `cat ${LOCK}`
fi
BUGS
shlock does not assumed to be used under a number of lock/unlock environment in a short time. Namely, shlock should be used for an envi-
ronment like daily or hourly based job.
HISTORY
Written by Rich $alz <rsalz@uunet.uu.net> after a description of HDB UUCP locking given by Peter Honeyman. This is revision 1.5.6.1, dated
2002/09/24.
SEE ALSO
inn.conf(5)
SHLOCK(1)