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errinfo(1m) [osx man page]

errinfo(1m)							   USER COMMANDS						       errinfo(1m)

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 description 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 directory. 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(1m)

Check Out this Related Man Page

syscallbysysc.d(1m)						   USER COMMANDS					       syscallbysysc.d(1m)

NAME
syscallbysysc.d - syscalls by syscall. Uses DTrace. SYNOPSIS
syscallbysysc.d DESCRIPTION
syscallbysysc.d is a DTrace OneLiner to a report of the number of each type of system call made. This is useful to identify which system call is the most common. Docs/oneliners.txt and Docs/Examples/oneliners_examples.txt in the DTraceToolkit contain this as a oneliner that can be cut-n-paste to run. Since this uses DTrace, only users with root privileges can run this command. EXAMPLES
This samples until Ctrl-C is hit. # syscallbysysc.d FIELDS
first field This is the system call type. Most have man pages in section 2. second field This is the count, the number of occurrances for this system call. DOCUMENTATION
See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver- bose descriptions explaining the output. EXIT
syscallbysysc.d will sample until Ctrl-C is hit. AUTHOR
Brendan Gregg [Sydney, Australia] SEE ALSO
procsystime(1M), dtrace(1M), truss(1) version 1.00 May 15, 2005 syscallbysysc.d(1m)
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