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Full Discussion: Inter-process communication:pipes,doors,etc.
Top Forums UNIX for Advanced & Expert Users Inter-process communication:pipes,doors,etc. Post 302159800 by adderek on Friday 18th of January 2008 04:39:29 PM
Old 01-18-2008
Maybe I will give you some more details.
I was to take code created by someone else. For logging from several simultaneous processes they are using many log files and from time to time they merge them all into one.
Until now I was thinking that when you are doing:
Code:
print "some even quite long message" >> file.txt

from several processes at once, then it would not interfere.
But they told me that they were receiving logs like:
"log number one
log numbelog number threer two
log number four"
Im ,y understanding this should never occur. But if this is the case then FIFO pseudo-device would be the best choice.
Anyway - I asked because according to my knowledge situation described by the other guy should not occur unless he is doing something like:
Code:
print "log number " >>file.txt
print "one" >>file.txt

 

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LEARN ABOUT HPUX

diaglogd

diaglogd(1M)															      diaglogd(1M)

NAME

       diaglogd -  Support Tools Manager logging daemon

SYNOPSIS

       /usr/sbin/stm/uut/bin/sys/diaglogd

DESCRIPTION

       The  Support  Tools Manager (STM) uses a logging daemon ( diaglogd ) to read diagnostic events from the kernel via diag2 (diagnostic pseudo
       driver) and logs them in the system log files.

       diaglogd is launched automatically at boot by the STM daemon diagmond.  The STM User Interface, xstm , mstm , or cstm , Daemon commands can
       also be used to launch the daemon as well as shut it down and view the daemon's activity log.

       The log files created by diaglogd can be viewed using the STM utility logtool.

   Application Usage
       This daemon will be deprecated on new server models. Please use System Management Homepage (see hpsmh(1M)).

WARNINGS

       The  following message will appear on the system console when the diagnostic logging facility determines that the I/O subsystem has started
       logging excessive I/O errors.  This message will appear only once and I/O errors will be lost until the diagnostic  subsystem  can  recover
       from this condition.

	DIAGNOSTIC SYSTEM WARNING:
	  The diagnostic logging facility has started receiving excessive
	  errors from the I/O subsystem.  I/O error entries will be lost
	  until the cause of the excessive I/O logging is corrected.
	  If the diaglogd daemon is not active, use the Daemon Startup
	  command in stm to start it. If the diaglogd daemon is active, use
	  the logtool utility in stm to determine which I/O subsystem is
	  logging excessive errors.

       The  following  message will appear on the system console when the cause of the excessive I/O error logging is corrected.  The total number
       of I/O errors that were dropped will be placed in "XX".

	DIAGNOSTIC SYSTEM WARNING:
	  The diagnostic logging facility is no longer receiving excessive
	  errors from the I/O subsystem.  XX I/O error entries were lost.

OTHER FILES

       /dev/diag/diag0 - Series 800 Diagnostic pseudo driver device file
       /dev/diag/diag1 - Series 700 Diagnostic pseudo driver device file
       /dev/diag/diag2 - Series 700/800 Diagnostic pseudo driver device file
       /var/stm/logs/sys/activity_log_diaglogd - Activity log of diaglogd
       /var/stm/logs/os/log##.raw - OS system log files
       /var/stm/logs/os/log##.raw.cur - Current OS system log file
       /var/stm/config/sys/diaglogd.cfg - Diagmond configuration
       /var/stm/data/daemon_list - List of daemons installed
       /var/stm/data/key_file - OS resource key file

COPYRIGHT

       (c) Copyright 1995, Hewlett-Packard Company

ORIGIN

       diaglogd was developed by Hewlett-Packard Company.

SEE ALSO

       stm(1M), diagmond(1M)

																      diaglogd(1M)
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