strace(8)						      System Manager's Manual							 strace(8)

NAME

       strace - Writes STREAMS event trace messages to standard output

SYNOPSIS

       /usr/sbin/strace [mod_ID sub_ID pri_level]

DESCRIPTION

       The strace command gets STREAMS event trace messages from STREAMS drivers and modules via the STREAMS log driver (strlog), and writes these
       messages to standard output.  You can limit the messages strace receives by specifying arguments to the command.  The arguments, which must
       be  specified together, are the following: Specifies the STREAMS module identification number.  Specifies a subidentification number (often
       corresponding to a minor device).  Specifies a tracing priority level.  The strace command will get messages of a level equal  to  or  less
       than the value in the pri_level argument.  The value of the argument must be a nonnegative integer.

       You  can  specify all as the value for any of the arguments in the strace command line.	The value all indicates that there are no restric-
       tions for that argument.

       You can also specify multiple sets of the command's three arguments to obtain the messages from more than one driver or module.

       More than one strace process can open the STREAMS log driver at a time.	When you invoke strace, the log driver compares the sets of  argu-
       ments from the command line with actual trace messages, returning the messages that satisfy the criteria.

       STREAMS	event  trace messages have the following format: seqnum  stdtime  tickstime  pri_level	ntfycode  mod_ID   sub_ID  msgtext where:
       The event trace sequence number.  The time the message was sent, in the format hh:mm:ss.  The  time  the  message  was  sent,  measured	in
       machine	ticks  since  the  last boot.  The tracing priority level as defined by the STREAMS driver or module that originates the messages.
       Can be either of the following indicators: Indicates that the message has also been saved in the error log.   Indicates	that  the  message
       signaled  a  fatal error.  The module identification number of the trace message source.  The subidentification number of the trace message
       source.	The trace message text.

       The strace command runs until terminated by the user.

NOTES

       Running strace with several sets of arguments can negatively affect STREAMS performance, particularly for those modules and drivers sending
       the messages.

       Also  be  aware	that  strace  may  not be able to handle a large number of messages.  If drivers and modules return messages to strace too
       quickly, some may be lost.

EXAMPLES

       To display all trace messages received from the driver or module identified by mod_ID 28, enter: strace 28 all all To display  those  trace
       messages from the driver or module identified by mod_ID 28 and its minor devices identified by the sub_IDs 2, 3, and 4, enter: strace  28 2
       all  28 3 all  28 4 all
       This command line causes messages of any tracing priority level to be displayed.  To display the trace messages from  the  same	driver	or
       module and sub_IDs, but limited to certain priority levels, enter: strace  28 2 0  28 3 0  28 4 1 This command line specifies that messages
       from driver or module 28 and sub_IDs 2 and 3 must have a tracing priority of 0, and those from sub_ID 4 must have a tracing priority  equal
       to or less than 1.

RELATED INFORMATION

       Commands:  strclean(8), strerr(8).

       Interfaces: strlog(7).  delim off

																	 strace(8)