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 verbose 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]