errinfo - print errno for syscall fails. Uses DTrace. errinfo [-a|-A|-hsvZ] [-c command] 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 the root user or users with the dtrace_kernel privilege can run this command. Solaris stable - needs the syscall provider.

-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")

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

EXEC Program name (truncated)

SYSCALL System call name

ERR Value of errno

DESC Description of errno message

See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with verbose descriptions explaining the output. errinfo will run forever until Ctrl-C is hit.

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

Brendan Gregg [Sydney, Australia] dtrace(1M), truss(1)