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Efficient logging of time measurements

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# 15  
Old 03-10-2013
Instead of pipes -- if you're worried about resources or blocking, simply use a single thread that reads a message queue. Once a message queue (SYSV or POSIX) is set up there is a single syscall ( e.g., msgsnd, no blocking ) that is mt-safe and a mutex is not required.

The buffersize, unlike, a pipe, can be any size. The message queue buffer is kernel persistent, so if the entire set of threads/processes using the message queue die, the data is still available. Pipes are closed on process termination.
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LEARN ABOUT REDHAT

testprns

TESTPRNS(1)															       TESTPRNS(1)

NAME

       testprns - check printer name for validity with smbd

SYNOPSIS

       testprns printername [ printcapname ]

DESCRIPTION

       This tool is part of the  Samba suite.

       testprns is a very simple test program to determine whether a given printer name is valid for use in a service to be provided by  smbd(8)

       "Valid"	in  this  context means "can be found in the printcap specified". This program is very stupid - so stupid in fact that it would be
       wisest to always specify the printcap file to use.

OPTIONS

       printername
	      The printer name to validate.

	      Printer names are taken from the first field in each record in the printcap file, single printer names and sets of aliases separated
	      by  vertical  bars ("|") are recognized.	Note that no validation or checking of the printcap syntax is done beyond that required to
	      extract the printer name. It may be that the print spooling system is more forgiving or less forgiving than  testprns.  However,	if
	      testprns finds the printer then smbd should do so as well.

       printcapname
	      This is the name of the printcap file within which to search for the given printer name.

	      If no printcap name is specified testprns will attempt to scan the printcap file name specified at compile time.

FILES

       /etc/printcap
	      This is usually the default printcap file to scan. See printcap (5).

DIAGNOSTICS

       If a printer is found to be valid, the message "Printer name <printername> is valid" will be displayed.

       If a printer is found to be invalid, the message "Printer name <printername> is not valid" will be displayed.

       All  messages  that  would  normally be logged during operation of the Samba daemons are logged by this program to the file test.log in the
       current directory. The program runs at debuglevel 3, so quite extensive logging information is written. The log should be checked carefully
       for errors and warnings.

       Other messages are self-explanatory.

VERSION

       This man page is correct for version 2.2 of the Samba suite.

SEE ALSO

       printcap(5), smbd(8) smbclient(1)

AUTHOR

       The  original  Samba  software  and  related utilities were created by Andrew Tridgell. Samba is now developed by the Samba Team as an Open
       Source project similar to the way the Linux kernel is developed.

       The original Samba man pages were written by Karl Auer.	The man page sources were converted to YODL format  (another  excellent  piece	of
       Open  Source  software,	available  at ftp://ftp.icce.rug.nl/pub/unix/ <URL:ftp://ftp.icce.rug.nl/pub/unix/>) and updated for the Samba 2.0
       release by Jeremy Allison. The conversion to DocBook for Samba 2.2 was done by Gerald Carter

								 19 November 2002						       TESTPRNS(1)