---
name: "shmsnoop-bpfcc"
section: "8"
platform: "linux"
package: "bpfcc-tools"
version: "0.31.0+ds-7"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/shmsnoop-bpfcc"
---

# shmsnoop-bpfcc(8)

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

## 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)