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Full Discussion: File write begin/end, recording time
Top Forums UNIX for Beginners Questions & Answers File write begin/end, recording time Post 303042884 by rbatte1 on Thursday 9th of January 2020 11:02:05 AM
Old 01-09-2020
Hello mrAibo,

You might get some joy from the output of the stat command. The file is Modified as it is created and Changed as the content is written, however this might not be safe for a polling process to be sure the file is complete.

What is the overall goal of the process you are looking to automate?

It might be safer to write a flag file when the real IO has completed, e.g. the file name might be abc123def456.output and this grows as the data is written/transferred. At the end of the writing process, just touch abc123def456.output.complete A reading process should look for files ending .complete and only then attempt to work with the real data file. Of course, there is then an extra file to tidy away and an extra IO, but the time taken should be negligible.


Does this better suit what you need, or have I missed the point?

Kind regards,
Robin
 

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LEARN ABOUT HPUX

rtprio

rtprio(1)						      General Commands Manual							 rtprio(1)

NAME

       rtprio - execute process with real-time priority

SYNOPSIS

       priority command [arguments]

       priority

       command [arguments]

DESCRIPTION

       executes  command  with	a  real-time priority, or changes the real-time priority of currently executing process pid.  Real-time priorities
       range from zero (highest) to 127 (lowest).  Real-time processes are not subject to priority degradation, and are all of	greater  (schedul-
       ing) importance than non-real-time processes.  See rtprio(2) for more details.

       If  is specified instead of a real-time priority, executes command with a timeshare (non-real-time) priority, or changes the currently exe-
       cuting process pid from a possibly real-time priority to a timeshare priority.  The former is useful to spawn a timeshare priority  command
       from a real-time priority shell.

       If  is  not  specified, command is not scheduled, or pid's real-time priority is not changed, if the user is not a member of a group having
       access and is not the user with appropriate privileges.	When changing the real-time priority of a currently executing process, the  effec-
       tive  user  ID of the calling process must be the user with appropriate privileges, or the real or effective user ID must match the real or
       saved user ID of the process to be modified.

RETURN VALUE

       returns exit status 0 if command is successfully scheduled or if pid's real-time priority is successfully changed, 1 if command is not exe-
       cutable	or pid does not exist, and 2 if command (pid) lacks real-time capability, or the invoker's effective user ID is not a user who has
       appropriate privileges, or the real or effective user or the real or effective user ID does not match the real or  saved  user  ID  of  the
       process being changed.

EXAMPLES

       Execute file at a real-time priority of 100:

       Set the currently running process pid 24217 to a real-time priority of 40:

AUTHOR

       was developed by HP.

SEE ALSO

       setprivgrp(1M), getprivgrp(2), rtprio(2).

																	 rtprio(1)
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