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errinfo(1)                      USER COMMANDS                     errinfo(1)




NAME

       errinfo - print errno for syscall fails. Uses DTrace.


SYNOPSIS

       errinfo [-a|-A|-hsvZ] [-c command]


DESCRIPTION

       errinfo snoops syscall failures and prints the errno value and descrip-
       tion of the error number.

       This program can help determine if applications are  silently  failing,
       providing some details on the cause.

       Since  this  uses  DTrace, only users with root privileges can run this
       command.


OPTIONS

       -c     counts - print an aggregate style report containing a  frequency
              count of errors

       -p PID examine this PID only

       -n name
              examine processes with ths name only (eg, "ls")


EXAMPLES

       Default output, print errors as they occur,
              # errinfo


       Print a frequency count report,
              # errinfo -c


       Snoop errors as they occur for "ssh" processes,
              # errinfo -n ssh PP

       Snoop errors for PID 81 only,
              # errinfo -p 81



FIELDS

       EXEC   Program name (truncated)

       SYSCALL
              System call name

       ERR    Value of errno

       DESC   Description of errno message



DOCUMENTATION

       See  the  DTraceToolkit for further documentation under the Docs direc-
       tory. The DTraceToolkit docs may include full worked examples with ver-
       bose descriptions explaining the output.


EXIT

       errinfo will run forever until Ctrl-C is hit.


FILES

       /usr/include/sys/errno.h
              Contains the full descriptions for the error numbers.



AUTHOR

       Brendan Gregg [Sydney, Australia]


SEE ALSO

       dtrace(1M), truss(1)




version 1.10                     May 14, 2005                      errinfo(1)

Mac OS X 10.6 - Generated Thu Sep 17 20:07:34 CDT 2009
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