peekfd(1)

peek at file descriptors of running processes

Section 1 psmisc bookworm source

Description

PEEKFD

NAME

peekfd - peek at file descriptors of running processes

SYNOPSIS

peekfd [-8,--eight-bit-clean] [-n,--no-headers] [-c,--follow] [-d,--duplicates-removed] [-V,--version] [-h,--help] pid [fd] [fd] ...

DESCRIPTION

peekfd attaches to a running process and intercepts all reads and writes to file descriptors. You can specify the desired file descriptor numbers or dump all of them.

OPTIONS

	-8		Do no post-processing on the bytes being read or written.
	-n		Do not display headers indicating the source of the bytes dumped.
	-c		Also dump the requested file descriptor activity in any new child processes that are created.
	-d		Remove duplicate read/writes from the output. If you’re looking at a tty with echo, you might want this.
	-v		Display a version string.
	-h		Display a help message.

FILES

/proc/*/fd

Not used but useful for the user to look at to get good file descriptor numbers.

ENVIRONMENT

None.

DIAGNOSTICS

The following diagnostics may be issued on stderr:
Error attaching to pid <PID>

An unknown error occurred while attempted to attach to a process, you may need to be root.

BUGS

Probably lots. Don’t be surprised if the process you are monitoring dies.

AUTHOR

Trent Waddington