peekfd (1) Linux Manual Page
NAME
peekfd – peek at file descriptors of running processes
SYNOPSIS
peekfd [-8,–eight-bit-clean] [-n,–no-headers] [-f,–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
SEE ALSO
ttysnoop(8)