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Full Discussion: File copy problem?
Top Forums UNIX for Advanced & Expert Users File copy problem? Post 302707695 by steadyonabix on Saturday 29th of September 2012 12:18:04 PM
Old 09-29-2012
File copy problem?
Hi All

I can't get my head around a problem I have with a control file.

The file is to control a "Listener" of sorts that listens on a named pipe. A script kicks off the listener in the background and passes it a control file. In the file it sets the Status field to pending. It then waits for the listener to get up and running and change its status to "Listening" before launching another job that uses the named pipe to report its status.

The control file: -

Code:
Name:m_fatal_error
Pid:20755
JobFile:/home/sshtest/muse/run/demo/120929165000/m_control/4-m_job_data_10519
LogFile:/home/sshtest/muse/run/demo/120929165000/m_control/m_run_log
TmpFile:/home/sshtest/muse/run/demo/120929165000/m_tmp/1_u_listener_4498.tmp
JobHost:tx5xn
Start:12/09/29-16:50:01
Finish:
Pipe:4-m_msg_data_10519
Status:Pending
Constants:/home/brad/wip/muse_root/lib/muse.constants
sshtest@ubuntu-dt64:~$ cat /home/sshtest/muse/run/demo/120929165000/m_tmp/1_u_listener_4498.tmp

The listener uses a function (that works 90% of the time) to change the status to Listening -

Code:
m_write_ctl_file_field ${C_MSG_JOB_STATUS} "Listening" "${MSG_CTL_FILE}"

Code:
m_write_ctl_file_field()
{
        TMP="$(sed -n ''${1}'p' ${3} | cut -d":" -f1):${2}"
        for s in ${PIPESTATUS[@]}; do [[ $s -eq 0 ]] || error_exit "Error:Pipe failed 2 (${SCRIPT})" ; done
        awk -v ln=${1} -v lo="${TMP}" '(NR == ln){print lo;next}{print $0}' "${3}" > "${U_MSG_TMPFILE}"
        cp "${U_MSG_TMPFILE}" "${3}" || error_exit "Error: cp failed in m_write_ctl_file_field"
}

C_MSG_JOB_STATUS is the line number for the status field
MSG_CTL_FILE is the control file
and "Listening" is my change of status

When I look in the tmp file this function uses after I time out waiting for the listener to change its status to listening -

Code:
Name:m_fatal_error
Pid:
JobFile:/home/sshtest/muse/run/demo/120929165000/m_control/4-m_job_data_10519
LogFile:/home/sshtest/muse/run/demo/120929165000/m_control/m_run_log
TmpFile:/home/sshtest/muse/run/demo/120929165000/m_tmp/1_u_listener_4498.tmp
JobHost:tx5xn
Start:12/09/29-16:50:01
Finish:
Pipe:4-m_msg_data_10519
Status:Listening
Constants:/home/brad/wip/muse_root/lib/muse.constants

So the function has written it to the tmp file. The check on the exit status for the cp command doesn't seem to error or I would see an error log in /tmp. So I can't understand why the tmp file and the control file aren't the same....

like I said, most of the time this code works.

I'm wondering if this is some sort of buffering problem and whether I need to adopt a safer method that explicitly closes the file or something???

Any help appreciated Smilie

Steady
 

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