strace - Writes STREAMS event trace messages to standard
/usr/sbin/strace [mod_ID sub_ID pri_level]
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.
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. All three operands must be specified
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 restrictions for that argument.
You can also specify multiple sets of the command's three
arguments to obtain the messages from more than one driver
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 arguments from the command line with
actual trace messages, returning the messages that satisfy
STREAMS event trace messages have the following format:
seqnum stdtime tickstime pri_level ntfycode mod_ID
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.
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.
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.
Commands: strclean(8), strerr(8)
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