strace(1m)                 DG/UX 4.30                  strace(1m)



     NAME
          strace - print STREAMS trace messages

     SYNOPSIS
          strace [ mid sid level ] ...

     DESCRIPTION
          Strace 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 (log(7)).  If arguments are provided, they must be in
          triplets of the form mid, sid, level, where mid is a STREAMS
          module id number, sid is a sub-id number, and level 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 all may be
          used for any member to indicate no restriction for that
          attribute.

          The format of each trace message output is:

          <seq> <time> <ticks> <level> <flags> <mid> <sid> <text>

          <seq>     trace sequence number

          <time>    time of message in hh:mm:ss

          <ticks>   time of message in machine ticks since boot

          <level>   tracing priority level

          <flags>   E : message is also in the error log
                    F : indicates a fatal error
                    N : mail was sent to the system administrator

          <mid>     module id number of source

          <sid>     sub-id number of source

          <text>    formatted text of the trace message

          Once initiated, strace will continue to execute until
          terminated by the user.

     EXAMPLES
          Output all trace messages from the module or driver whose
          module id is 41:

               strace  41 all all

          Output those trace messages from driver/module id 41 with



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     strace(1m)                 DG/UX 4.30                  strace(1m)



          sub-ids 0, 1, or 2:

               strace  41 0 1  41 1 1  41 2 0

          Messages from sub-ids 0 and 1 must have a tracing level less
          than or equal to 1.  Those from sub-id 2 must have a tracing
          level of 0.

     CAVEATS
          Due to performance considerations, only one strace process
          is permitted to open the STREAMS log driver at a time.  The
          log driver has a 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 strace process.  Hence, long
          lists of triplets will have a greater impact on overall
          STREAMS performance.  Running strace will have the most
          impact on the timing of the modules and drivers generating
          the trace messages that are sent to the strace process.  If
          trace messages are generated faster than the strace 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.

     SEE ALSO
          strerr(1M), log(7).
          STREAMS Programmer's Guide for the DG/UX System.




























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