rwsnoop(1) USER COMMANDS rwsnoop(1)
NAME
rwsnoop - snoop read/write events. Uses DTrace.
SYNOPSIS
rwsnoop [-jPtvZ] [-n name] [-p PID]
DESCRIPTION
This is measuring reads and writes at the application level. This matches the syscalls read, write, pread and pwrite. Since this uses DTrace, only users with root privileges can run this command.
OPTIONS
-j print project ID -P print parent process ID -t print timestamp, us -v print time, string -Z print zone ID -n name process name to track -p PID PID to track
EXAMPLES
Default output, # rwsnoop Print zone ID, # rwsnoop -.Monitor processes named "bash", # rwsnoop -n bash
FIELDS
TIME timestamp, us TIMESTR time, string ZONE zone ID PROJ project ID UID user ID PID process ID PPID parent process ID CMD command name for the process D direction, Read or Write BYTES total bytes during sample FILE filename, if file based. Reads and writes that are not file based, for example with sockets, will print "<unknown>" as the filename.
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
rwsnoop will run forever until Ctrl-C is hit.
AUTHOR
Brendan Gregg [Sydney, Australia]
SEE ALSO
rwtop(1M), dtrace(1M) version 0.70 Jul 24, 2005 rwsnoop(1)
Mac OS X 10.6 - Generated Thu Sep 17 20:09:05 CDT 2009