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Top Forums Programming Want to get /var/log/messages redirected to a FIFO ... Post 302272411 by Praveen_218 on Tuesday 30th of December 2008 01:52:11 PM
Old 12-30-2008
HI redoubtable,
Can you please elaborate further on ptrace() solution?

Ya, your suggestion "man-in-middle" is great, but again I need an access to the configuration files and its really do-able if I get to edit syslog.conf. Thanks for the input.

Panos method is also good enough and its similar to the way tail utility has been implemented and I've incorporated this too in my solution and used fstat() to look for the file size changes and lseek() to adjust file pointer and waiting with nanosleep() before subsequent fstat() calls.

Looking further to have another round of discussion on ptrace() .
 

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strerr(1M)						  System Administration Commands						strerr(1M)

NAME
strerr - STREAMS error logger daemon SYNOPSIS
strerr DESCRIPTION
strerr receives error log messages from the STREAMS log driver (see log(7D)) and appends them to a log file. The resultant error log files reside in the directory /var/adm/streams, and are named error.mm-dd, where mm is the month and dd is the day of the messages contained in each log file. The format of an error log message is: <seq> <time> <ticks> <flags> <mid> <sid> <text> <seq> error sequence number <time> time of message in hh:mm:ss <ticks> time of message in machine ticks since boot priority level <flags> T : the message was also sent to a tracing process F : indicates a fatal error N : send mail to the system administrator (hardcoded as root) <mid> module ID number of source <sid> sub-ID number of source <text> formatted text of the error message Messages that appear in the error log are intended to report exceptional conditions that require the attention of the system administrator. Those messages which indicate the total failure of a STREAMS driver or module should have the F flag set. Those messages requiring the immediate attention of the administrator will have the N flag set, which causes the error logger to send the message to the system adminis- trator using mail. The priority level usually has no meaning in the error log but will have meaning if the message is also sent to a tracer process. Once initiated, strerr continues to execute until terminated by the user. It is commonly executed asynchronously. FILES
/var/adm/streams/error.mm-dd error log file. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
attributes(5), log(7D) STREAMS Programming Guide NOTES
There is no restriction to the number of strerr processes opening the STREAMS log driver at a time. If a module or driver is generating a large number of error messages, running the error logger will cause a degradation in STREAMS perfor- mance. If a large burst of messages are generated in a short time, the log driver may not be able to deliver some of the messages. This situation is indicated by gaps in the sequence numbering of the messages in the log files. SunOS 5.10 4 Oct 1994 strerr(1M)
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