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shlock (1)
  • >> shlock (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
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    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 packages.
    -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
    
     

    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, dated 1998/04/09.  

    SEE ALSO

    inn.conf(5)


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    OPTIONS
    EXAMPLES
    HISTORY
    SEE ALSO


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