shmsnoop

NAME

shmsnoop - Trace System V shared memory syscalls. Uses Linux eBPF/bcc.

SYNOPSIS

shmsnoop [-h] [-T] [-p] [-t] [-d DURATION] [-n NAME]

DESCRIPTION

shmsnoop traces System V shared memory syscalls: shmget, shmat, shmdt, shmctl

Since this uses BPF, only the root user can use this tool.

REQUIREMENTS

CONFIG_BPF and bcc.

OPTIONS

	-h		Print usage message.
	-T		Include a timestamp column.

-p PID

Trace this process ID only (filtered in-kernel).

-t TID

Trace this thread ID only (filtered in-kernel).

-d DURATION

Total duration of trace in seconds.

-n NAME

Only print command lines matching this command name (regex)

EXAMPLES

Trace all shm* syscalls:

# shmsnoop

Trace all shm* syscalls, and include timestamps:

# shmsnoop -T

Only trace shm* syscalls where the process contains "server":

# shmsnoop -n server

FIELDS

TIME(s)

Time of shm syscall return, in seconds.

	PID		Process ID
	COMM		Process/command name.
	RET		Return value of shm syscall.
	ARGS		"arg: value" couples that represent given syscall arguments as described in their manpage

SOURCE

This is from bcc.

https://github.com/iovisor/bcc

Also look in the bcc distribution for a companion _examples.txt file containing example usage, output, and commentary for this tool.

OS

Linux

STABILITY

Unstable - in development.

AUTHOR

Jiri Olsa

SEE ALSO

opensnoop(1)