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shmsnoop(8) System Manager's Manual shmsnoop(8)

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
Parent 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)
2018-09-24 USER COMMANDS