.TH statsnoop 8  "2018-09-08" "USER COMMANDS"
.SH NAME
statsnoop.bt \- Trace stat() syscalls. Uses bpftrace/eBPF.
.SH SYNOPSIS
.B statsnoop.bt
.SH DESCRIPTION
statsnoop traces the stat() syscall, showing which processes are attempting
to stat which files. This can be useful for determining the location of config
and log files, or for troubleshooting applications that are failing, specially
on startup.

This traces the tracepoints for statfs(), statx(), newstat(), and
newlstat(). These aren't the only the stat syscalls: if you are missing
activity, you may need to add more variants.

Since this uses BPF, only the root user can use this tool.
.SH REQUIREMENTS
CONFIG_BPF and bcc.
.SH EXAMPLES
.TP
Trace all stat() syscalls:
#
.B statsnoop.bt
.SH FIELDS
PID
Process ID
.TP
TID
Thread ID
.TP
COMM
Process name
.TP
FD
File descriptor (if success), or -1 (if failed)
.TP
ERR
Error number (see the system's errno.h)
.TP
PATH
Stat path
.SH OVERHEAD
This traces the stat tracepoints and prints output for each event. As the
rate of this is generally expected to be low (< 1000/s), the overhead is also
expected to be negligible. If you have an application that is calling a high
rate of stat()s, then test and understand overhead before use.
.SH SOURCE
This is from bpftrace.
.IP
https://github.com/iovisor/bpftrace
.PP
Also look in the bpftrace distribution for a companion _examples.txt file containing
example usage, output, and commentary for this tool.

This is a bpftrace version of the bcc tool of the same name. The bcc tool
may provide more options and customizations.
.IP
https://github.com/iovisor/bcc
.SH OS
Linux
.SH STABILITY
Unstable - in development.
.SH AUTHOR
Brendan Gregg
.SH SEE ALSO
opensnoop(8), execsnoop(8)