'\" te
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.TH strace 1M "4 Oct 1994" "SunOS 5.11" "System Administration Commands"
.SH NAME
strace \- print STREAMS trace messages
.SH SYNOPSIS
.LP
.nf
\fBstrace\fR [\fImid\fR \fIsid\fR \fIlevel\fR]...
.fi

.SH DESCRIPTION
.sp
.LP
\fBstrace\fR without arguments writes all STREAMS event trace messages from all
drivers and modules to its standard output. These messages are obtained from
the STREAMS log driver (see \fBlog\fR(7D)). If arguments are provided, they
must be in triplets of the form \fImid, sid, level\fR, where \fImid\fR is a
STREAMS module  \fBID\fR number, \fIsid\fR is a sub-ID number,  and \fIlevel\fR
is a tracing priority level. Each triplet indicates that tracing messages are
to be received from the given module/driver, sub-ID (usually indicating minor
device), and priority level equal to, or less than the given level. The token
\fBall\fR may be used for any member to indicate no restriction for that
attribute.
.sp
.LP
The format of each trace message output is:
.sp
.LP
<\fIseq\fR> <\fBtime\fR> <\fIticks\fR> <\fIlevel\fR> <\fIflags\fR> <\fImid\fR>
<\fIsid\fR> <\fItext\fR>
.sp
.ne 2
.mk
.na
\fB<\fIseq\fR>\fR
.ad
.RS 11n
.rt  
trace sequence number
.RE

.sp
.ne 2
.mk
.na
\fB<\fBtime\fR>\fR
.ad
.RS 11n
.rt  
time of message in \fIhh:mm:ss\fR
.RE

.sp
.ne 2
.mk
.na
\fB<\fIticks\fR>\fR
.ad
.RS 11n
.rt  
time of message in machine ticks since boot
.RE

.sp
.ne 2
.mk
.na
\fB<\fIlevel\fR>\fR
.ad
.RS 11n
.rt  
tracing priority level
.RE

.sp
.ne 2
.mk
.na
\fB<\fIflags\fR>\fR
.ad
.RS 11n
.rt  
E : message is also in the error log F : indicates a fatal error N : mail was
sent to the system administrator (hardcoded as root)
.RE

.sp
.ne 2
.mk
.na
\fB<\fImid\fR>\fR
.ad
.RS 11n
.rt  
module  \fBID\fR number of source
.RE

.sp
.ne 2
.mk
.na
\fB<\fIsid\fR>\fR
.ad
.RS 11n
.rt  
sub-ID number of source
.RE

.sp
.ne 2
.mk
.na
\fB<\fItext\fR>\fR
.ad
.RS 11n
.rt  
formatted text of the trace message
.RE

.sp
.LP
Once initiated, \fBstrace\fR will continue to execute until terminated by the
user.
.SH EXAMPLES
.LP
\fBExample 1 \fRA sample output of the \fBstrace\fR command:
.sp
.LP
The following example outputs all trace messages from the module or driver
whose module  \fBID\fR is  \fB41\fR:

.sp
.in +2
.nf
\fBstrace  41 all all\fR
.fi
.in -2
.sp

.sp
.LP
The following example outputs those trace messages from driver or module
\fBID\fR \fB41\fR with  sub-IDs \fB0\fR, \fB1\fR, or  \fB2\fR:

.sp
.in +2
.nf
\fBstrace  41 0 1  41 1 1  41 2 0\fR
.fi
.in -2
.sp

.sp
.LP
Messages from sub-IDs  \fB0\fR and  \fB1\fR must have  a tracing level less
than or equal to  \fB1\fR. Those from sub-ID  \fB2\fR must have a tracing level
of  \fB0\fR.

.SH SEE ALSO
.sp
.LP
\fBattributes\fR(5), \fBlog\fR(7D)
.sp
.LP
\fI\fR
.SH NOTES
.RS +4
.TP
.ie t \(bu
.el o
There is no restriction to the number of \fBstrace\fR processes opening the
\fBSTREAMS\fR log driver at a time.
.RE
.RS +4
.TP
.ie t \(bu
.el o
The log-driver records the list of the triplets specified in the command
invocation, and compares each potential trace message against this list to
decide if it should be formatted and sent up to the \fBstrace\fR process.
Hence, long lists of triplets will have a greater impact on overall STREAMS
performance. Running \fBstrace\fR will have the most impact on the timing of
the modules and  drivers generating the trace messages that are sent to the
\fBstrace\fR process. If trace messages are generated faster than the
\fBstrace\fR process can handle them,  some of the messages will be lost. This
last case can be determined by examining the sequence numbers on the trace
messages output.
.RE