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viosnoop.sge
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#!/bin/sh
# vi: set ft=sh noet ts=8 sw=8 :: Vi/ViM
############################################################ IDENT(1)
#
# $Title: Script to snoop on VFS I/O under Linux $
# $Copyright: 2020-2021 Devin Teske. All rights reserved. $
# $FrauBSD: viosnoop/viosnoop.sge 2021-10-14 13:48:39 -0700 freebsdfrau $
#
############################################################ DEFAULTS
DEFAULT_TIME_FMT="%Y %b %e %T"
############################################################ GLOBALS
VERSION='$Version: 5.3.1 $'
pgm="${0##*/}" # Program basename
#
# Global exit status
#
SUCCESS=0
FAILURE=1
#
# Command-line options
#
COLOR= # -c
DEBUG= # -d
FILTER_FOLLOW= # -f
FILTER_GROUP= # -g group
FILTER_JOB= # -j job
FILTER_PID= # -p pid
FILTER_TYPE= # -B, -E, -N, -T type, -X
FILTER_USER= # -u user
IGNORE_RUNNING= # -n
QUIET= # -q
RAW_OUTPUT= # -r
SHOW_PATHS=1 # -F
SILENT= # -s
TIMEOUT_LSOF= # -L time
TIME_FMT="$DEFAULT_TIME_FMT" # -t fmt
#
# Probes
# NB: Dependent on kernel version
# NB: export'd for awk(1) `ENVIRON' access
#
export KPROBE_EXECVE=kprobe:do_execve
export KRETPROBE_EXECVE=kretprobe:do_execve
export KPROBE_EXECVE_LEGACY=kprobe:SyS_execve
export KRETPROBE_EXECVE_LEGACY=kretprobe:SyS_execve
export KPROBE_VFS_FSTAT=kprobe:vfs_fstat
export KRETPROBE_VFS_FSTAT=kretprobe:vfs_fstat
export KPROBE_VFS_FSTAT_PRE_da9aa5d=kprobe:vfs_statx_fd
export KRETPROBE_VFS_FSTAT_PRE_da9aa5d=kretprobe:vfs_statx_fd
#
# Miscellaneous
#
COMM=
CONS=1
FILTER_GID=
FILTER_UID=
FOLLOW_PIDS=
FORK_CONDITION=
IGNORE_PIDS=
MAP_ID_FOLLOW=
MAP_ID_SGE=
MAP_ID_TRACE=
OPEN_CONDITION=
OPEN_FDS=
POSTPROC_PID=
PREPROC_PID=
RAW_TIME_FMT='"%s"'
SGE_CONDITION=
SGE_JOBS=
SSHD_PID=
TRACE_PATHS=1
############################################################ FUNCTIONS
die()
{
local fmt="$1"
if [ "$fmt" ]; then
shift 1 # fmt
printf "%s: $fmt\n" "$pgm" "$@" >&2
fi
exit $FAILURE
}
info()
{
[ ! "$SILENT" ] || return
printf "${CONS:+\033[35m}INFO${CONS:+\033[39m} %s\n" "$*" >&2
}
warn()
{
[ ! "$SILENT" ] || return
printf "${CONS:+\033[31;1m}WARNING${CONS:+\033[39;22m} %s\n" "$*" >&2
}
usage()
{
local optfmt="\t%-11s %s\n"
exec >&2
printf "Usage: %s [OPTIONS] [comm]\n" "$pgm"
printf "Options:\n"
printf "$optfmt" "-B" "Filter on BeeGFS filesystems."
printf "$optfmt" "-c" "Always enabled color."
printf "$optfmt" "-d" "Debug. Print script and exit."
printf "$optfmt" "-E" "Filter on Ext filesystems."
printf "$optfmt" "-F" "Do not display file/directory paths."
printf "$optfmt" "-f" "Follow descendents of matching processes."
printf "$optfmt" "-g group" "Filter on group. Can be name or GID."
printf "$optfmt" "-h" "Print usage statement and exit."
printf "$optfmt" "-j job" "Filter on job id."
printf "$optfmt" "-L time" "lsof(8) timeout duration. Default none."
printf "$optfmt" "-N" "Filter on NFS filesystems."
printf "$optfmt" "-n" "Ignore already-running processes."
printf "$optfmt" "-p pid" "Trace process whose id is pid."
printf "$optfmt" "-q" "Quiet. Hide dup*, open/close, and null r/w."
printf "$optfmt" "-r" "Show unformatted raw output."
printf "$optfmt" "-S" "Filter on SMB filesystems."
printf "$optfmt" "-s" "Silent. Hide informational messages/warnings."
printf "$optfmt" "-T type" "Filter on filesystem type."
printf "$optfmt" "-t fmt" "Time format. Default \`$DEFAULT_TIME_FMT'."
printf "$optfmt" "-u user" "Filter on user. Can be name or UID."
printf "$optfmt" "-v" "Print version and exit."
printf "$optfmt" "-X" "Filter on XFS filesystems."
printf "$optfmt" "-Z" "Filter on ZFS filesystems."
die
}
run_lsof()
{
[ "$DEBUG" ] && return
case "$FILTER_TYPE" in
""|nfs*) ${TIMEOUT_LSOF:+timeout "$TIMEOUT_LSOF"} lsof -X -N +c 0 ;;
esac
case "$FILTER_TYPE" in
nfs*) : skip ;;
*) ${TIMEOUT_LSOF:+timeout "$TIMEOUT_LSOF"} lsof -X +c 0 +e /
esac
}
run_bpftrace()
{
if [ "$DEBUG" ]; then
cat
return
fi
exec bpftrace -B none /dev/stdin
}
count()
{
local OPTIND=1 OPTARG __flag
local __delim="$IFS"
local __var_to_set=
while getopts d:s: __flag; do
case "$__flag" in
d) __delim="$OPTARG" ;;
s) __var_to_set="$OPTARG" ;;
esac
done
shift $(( $OPTIND - 1 ))
local IFS="$__delim"
set -- $*
if [ "$__var_to_set" ]; then
eval $__var_to_set=$#
else
echo $#
fi
}
getword()
{
local funcname=getword
local OPTIND=1 OPTARG __flag
local __delim="$IFS"
local __var_to_set=
local __word=
while getopts d:s:w: __flag; do
case "$__flag" in
d) __delim="$OPTARG" ;;
s) __var_to_set="$OPTARG" ;;
w) __word="$OPTARG" ;;
esac
done
shift $(( $OPTIND - 1 ))
case "$__word" in
""|*[!0-9]*) die "$funcname: \`-w' requires a number" ;;
esac
local IFS="$__delim"
set -- $*
if [ "$__var_to_set" ]; then
eval $__var_to_set=\"\$\{$__word\}\"
else
eval echo \"\$\{$__word\}\"
fi
}
num2bytes()
{
local __num="$1" __size="${2%B}" __var_to_set="$3"
local __out=
while [ $__size -gt 0 ]; do
__out="$__out $(( $__num % 256 ))"
__num=$(( $__num >> 8 ))
__size=$(( $__size - 1 ))
done
__out="${__out# }"
if [ "$__var_to_set" ]; then
eval $__var_to_set=\"\$__out\"
else
echo "$__out"
fi
}
bpf_prog_id()
{
local __pid="$1" __prog="$2" __var_to_set="$3"
local __ls __out __res
[ "$__pid" -a "$__prog" ] || return ${FAILURE:-1}
__ls=$( ls -l /proc/$__pid/fd ) || return
__out=$( echo "$__ls" | awk -v pid=$__pid -v prog="$__prog" '
$NF == "anon_inode:bpf-prog" {
fd = $(NF-2)
fdinfo = sprintf("/proc/%d/fdinfo/%d", pid, fd)
id = ""
while (getline < fdinfo > 0) {
if ($1 != "prog_id:") continue
id = $2
break
}
close(fdinfo)
if (id == "") next
cmd = sprintf("bpftool prog show id %d", id)
if (cmd | getline <= 0 || $4 != prog) {
close(cmd)
next
}
print id
exit found = 1
}
END { exit found ? 0 : 3 }
' )
__res=$?
if [ "$__var_to_set" ]; then
eval $__var_to_set=\"\$__out\"
else
echo "$__out"
fi
return $__res
}
bpf_map_ids()
{
local __prog="$1" __var_to_set="$2"
local __out __res
[ "$__prog" ] || return ${FAILURE:-1}
__out=$( bpftool prog show id $__prog ) || return
__out=$( echo "$__out" | awk '
$(NF-1) == "map_ids" {
print $NF
found = 1
exit
}
END { exit found ? 0 : 3 }
' )
__res=$?
if [ "$__var_to_set" ]; then
eval $__var_to_set=\"\$__out\"
else
echo "$__out"
fi
return $__res
}
############################################################ MAIN
#
# Process command-line options
#
while getopts BcdEFfg:hj:L:Nnp:qrSsT:t:u:vXZ flag; do
case "$flag" in
B) FILTER_TYPE=beegfs ;;
c) COLOR=1 ;;
d) DEBUG=1 ;;
E) FILTER_TYPE=ext ;;
F) SHOW_PATHS= ;;
f) FILTER_FOLLOW=1 ;;
g) FILTER_GROUP="$OPTARG" ;;
j) FILTER_JOB="$OPTARG" ;;
L) TIMEOUT_LSOF="$OPTARG" ;;
n) IGNORE_RUNNING=1 ;;
N) FILTER_TYPE=nfs ;;
p) [ "$OPTARG" ] || die "\`-p' requires an argument"
FILTER_PID="$OPTARG" ;;
q) QUIET=1 ;;
r) RAW_OUTPUT=1 ;;
S) FILTER_TYPE=smb ;;
s) SILENT=1 ;;
T) FILTER_TYPE="$OPTARG" ;;
t) TIME_FMT="$OPTARG" ;;
u) FILTER_USER="$OPTARG" ;;
v) VERSION="${VERSION#*: }"
echo "${VERSION% $}"
exit $SUCCESS ;;
X) FILTER_TYPE=xfs ;;
Z) FILTER_TYPE=zfs ;;
*) usage # NOTREACHED
esac
done
shift $(( $OPTIND - 1 ))
#
# Process command-line arguments
#
COMM="$1"
#
# Process `-c' command-line option
#
if [ "$COLOR" ]; then
CONS=1
else
[ -t 1 ] || CONS= # stdout is not a tty
fi
#
# Process `-f' command-line option
#
if [ "$FILTER_FOLLOW" ]; then
[ "$COMM$FILTER_GROUP$FILTER_JOB$FILTER_PID$FILTER_USER" ] ||
die "\`-f' requires \`%s', \`%s', \`%s', \`%s', or \`%s'" \
"-u user" "-g group" "-p pid" "-j job" "comm"
fi
#
# Process `-F' and `-q' command-line options
#
if [ "$QUIET" -a ! "$SHOW_PATHS" ]; then
TRACE_PATHS=
fi
#
# Validate `-L sec' option
#
case "$TIMEOUT_LSOF" in
"") : ok ;;
*[smhd])
case "${TIMEOUT_LSOF%?}" in
""|*[!0-9.]*|*.*.*|.) die "bad -L argument" ;;
esac
;;
*[!0-9.]*|*.*.*|.) die "bad -L argument" ;;
esac
#
# Process `-u user'/`-g group' options
#
case "$FILTER_USER" in
"") : leave-empty ;;
*[!0-9]*) # Translate from name to UID
FILTER_UID=$( getent passwd "$FILTER_USER" ) ||
die "Unknown user \`%s'" "$FILTER_USER"
FILTER_UID=$( echo "$FILTER_UID" | awk -F: '{print $3}' )
;;
*) # Translate from UID to name
FILTER_UID=$FILTER_USER
FILTER_USER=$( getent passwd $FILTER_UID ) ||
die "Unknown user id %d" "$FILTER_UID"
FILTER_USER=$( echo "$FILTER_USER" | awk -F: '{print $1}' )
esac
case "$FILTER_GROUP" in
"") : leave-empty ;;
*[!0-9]*) # Translate from name to GID
FILTER_GID=$( getent group "$FILTER_GROUP" ) ||
die "Unknown group \`%s'" "$FILTER_GROUP"
FILTER_GID=$( echo "$FILTER_GID" | awk -F: '{print $3}' )
;;
*) # Translate from GID to name
FILTER_GID=$FILTER_GROUP
FILTER_GROUP=$( getent group $FILTER_GID ) ||
die "Unknown group id %d" "$FILTER_GID"
FILTER_GROUP=$( echo "$FILTER_GROUP" | awk -F: '{print $1}' )
esac
#
# Process pid option
#
case "$FILTER_PID" in
*[!0-9]*) die "\`-p' option must be a number" ;;
esac
#
# Check user
#
if [ ! "$DEBUG" ]; then
if [ "${USER:=$( id -nu )}" != root ]; then
echo "Must be root!" >&2
exit $FAILURE
fi
info "Tracing I/O... Hit Ctrl-C to end."
fi
#
# Fixup PATH
#
case "$PATH" in
/usr/sbin:*|*:/usr/sbin:*|*:/usr/sbin) : ok ;;
*) PATH="${PATH:+$PATH:}/usr/sbin"
esac
#
# Run script
# NB: M-x package-install [RET] dtrace-script-mode [RET]
#
{
exec 3<&1
#
# Get process IDs
#
PREPROC_PID=$( ps -opid= -oppid= -oucomm= |
awk -v pid=$$ '$2==pid{print $1;exit}' )
POSTPROC_PID=$( pgrep -P $$ awk )
#
# Get sshd parent process ID if-applicable
#
pid=$PPID
while [ $pid -gt 1 ]; do
pid=$( ps -o ppid= -p $pid 2> /dev/null )
case "$( ps -o ucomm= -p $pid 2> /dev/null )" in
sshd)
SSHD_PID=$pid
break
;;
esac
done
#
# Ignore ourself
#
for pid in $$ $PREPROC_PID $POSTPROC_PID $SSHD_PID; do
IGNORE_PIDS="$IGNORE_PIDS $pid"
done
IGNORE_PIDS="${IGNORE_PIDS# }"
#
# Find SGE processes and their children
#
if [ ! "$IGNORE_RUNNING$FILTER_PID$DEBUG" ]; then
info "Gathering SGE job info..."
SGE_JOBS=$( pgrep sge_shepherd | xargs -r -n1 pgrep \
${FILTER_GROUP:+-G "$FILTER_GROUP"} \
${FILTER_USER:+-U "$FILTER_USER"} -P 2> /dev/null |
xargs -r -n1 pstree -p 2> /dev/null | awk \
-v debug=${DEBUG:-0} \
-v filter_job="$FILTER_JOB" \
-v silent=${SILENT:-0} \
-v sq="'" \
-v stderr=/dev/stderr \
-v timefmt="$TIME_FMT" \
'####################################### BEGIN
BEGIN {
job_pid = time = ""
nactive = njobs = job_found = 0
delete jobs_seen
if (filter_job ~ /^[0-9]+$/) {
want_job = filter_job
filter_job = sprintf("^%s$", filter_job)
} else {
want_job = "regex"
gsub(/\\/, "&&", filter_job)
}
if (timefmt != "") {
srand()
time = srand()
}
}
######################################## FUNCTIONS
function emit(str)
{
if (debug) return
printf "%s|%s\n", time, str
fflush()
}
function info(str)
{
if (!silent) emit(sprintf("info|%s", str))
}
function warn(str)
{
if (!silent) emit(sprintf("warn|%s", str))
}
function getstatus(pid, file, L)
{
comm = pcomm = ""
uid = gid = puid = pgid = ppid = 0
file = sprintf("/proc/%d/status", pid)
while (getline L < file > 0) {
if (sub(/^PPid:[[:space:]]*/, "", L)) {
ppid = L
} else if (sub(/^Name:[[:space:]]*/, "", L)) {
comm = L
} else if (sub(/^Uid:[[:space:]]*/, "", L)) {
sub(/[[:space:]].*/, "", L)
uid = L
} else if (sub(/^Gid:[[:space:]]*/, "", L)) {
sub(/[[:space:]].*/, "", L)
gid = L
}
}
close(file)
if (ppid == 0) return 0
file = sprintf("/proc/%d/status", ppid)
while (getline L < file > 0) {
if (sub(/^Name:[[:space:]]*/, "", L)) {
pcomm = L
} else if (sub(/^Uid:[[:space:]]*/, "", L)) {
sub(/[[:space:]].*/, "", L)
puid = L
} else if (sub(/^Gid:[[:space:]]*/, "", L)) {
sub(/[[:space:]].*/, "", L)
pgid = L
}
}
close(file)
return 1
}
function checkjob(pid,
file, L, nv, env, n, id, found, seen)
{
id = 0
seen = 1
file = sprintf("/proc/%d/environ", pid)
while (getline L < file > 0) {
nv = split(L, env, /\0/)
for (n = 1; n <= nv; n++) {
if (!sub(/^JOB_ID=/, "", env[n]))
continue
id = env[n]
if (!(id in jobs_seen)) seen = 0
break
}
if (id > 0) break
}
if (id > 0 && !seen) {
jobs_seen[id]
if (filter_job == "" || id ~ filter_job)
info("Found SGE job " id)
}
close(file)
return id
}
######################################## MAIN
match($0, /^[^[:space:](]+\([0-9]+\)/) {
njobs++
job_pid = $0
sub(/^[^(]*\(/, "", job_pid)
sub(/\).*/, "", job_pid)
job_id = checkjob(job_pid)
if (filter_job != "") {
if (job_id !~ filter_job) {
job_pid = ""
next
} else {
job_found = 1
}
}
}
job_pid != "" {
gsub(/[^0-9]/, " ")
gsub(/[[:space:]]+/, " ")
gsub(/(^[[:space:]]+|[[:space:]]+$)/, "")
npids = split($0, pids, /[[:space:]]+/)
for (n = 1; n <= npids; n++) {
if (!getstatus(pids[n])) continue
nactive++
#
# Print to stdout
# NB: default = awk, raw [-r] = stdout
#
if (pids[n] == job_pid) {
emit(sprintf("%s|%d.%d|%s|%d|%d|%d|0",
"fork_job", puid, pgid, pcomm,
ppid, job_pid, pids[n]))
}
# To bpftool map update
printf "%d=%d\n", pids[n], job_pid > stderr
}
if (job_found) exit
}
######################################## END
END {
if (filter_job != "" && !job_found) {
if (want_job == "regex") {
fmt = "No SGE jobs matching `%s" sq
warn(sprintf(fmt, filter_job))
} else {
fmt = "SGE job %d not found"
warn(sprintf(fmt, want_job))
}
}
}
' 2>&1 >&3 ) || die "%s" "$SGE_JOBS"
fi
#
# Find matching processes and their children
#
if [ "$FILTER_FOLLOW" -a ! "$IGNORE_RUNNING$DEBUG" ]; then
info "Gathering active process info..."
if [ "$FILTER_PID" ]; then
FOLLOW_PIDS=$( pstree -p $FILTER_PID | awk \
-v filter_group="$FILTER_GROUP" \
-v filter_user="$FILTER_USER" '
BEGIN { delete seen }
function del(re){gsub(re,"")}
function space(re){gsub(re," ")}
function check_group(pid, file, gid, L) {
if (filter_group == "") return 1 # OK
gid = ""
file = sprintf("/proc/%d/status", pid)
while (getline L < file > 0) {
if (L !~ /^Gid:/) next
sub(/^Gid:[[:space:]]*/, "", L)
sub(/[^0-9].*/, "", L)
gid = L
break
}
close(file)
return gid == filter_group
}
function check_user(pid, file, uid, L) {
if (filter_user == "") return 1 # OK
uid = ""
file = sprintf("/proc/%d/status", pid)
while (getline L < file > 0) {
if (L !~ /^Uid:/) next
sub(/^Uid:[[:space:]]*/, "", L)
sub(/[^0-9].*/, "", L)
uid = L
break
}
close(file)
return uid == filter_user
}
match($0, /^[^[:space:](]+\([0-9]+\)/) {
pid = substr($0, 1, RLENGTH - 1)
$0 = substr($0, RLENGTH + 1)
sub(/.*\(/, "", pid)
if (!(pid in seen)) pids = pids " " pid
}
{
space("[^0-9]")
space("[[:space:]]+")
del("(^[[:space:]]+|[[:space:]]+$)")
npids = split($0, list)
for (n = 1; n <= npids; n++) {
if ((pid = list[n]) in seen) continue
# group filter
if (!check_group(pid)) continue
# user filter
if (!check_user(pid)) continue
pids = pids " " pid
seen[pid]
}
}
END { print substr(pids, 2) }
' )
elif [ "$COMM$FILTER_USER$FILTER_GROUP" ]; then
FOLLOW_PIDS=$( pgrep ${COMM:+"$COMM"} \
${FILTER_USER:+-U "$FILTER_USER"} \
${FILTER_GROUP:+-G "$FILTER_GROUP"} |
awk '
BEGIN { delete seen }
function del(re){gsub(re,"")}
function space(re){gsub(re," ")}
match($0, /^[^[:space:](]+\([0-9]+\)/) {
pid = substr($0, 1, RLENGTH - 1)
$0 = substr($0, RLENGTH + 1)
sub(/.*\(/, "", pid)
if (!(pid in seen)) pids = pids " " pid
}
{
space("[^0-9]")
space("[[:space:]]+")
del("(^[[:space:]]+|[[:space:]]+$)")
npids = split($0, list)
for (n = 1; n <= npids; n++) {
if ((pid = list[n]) in seen) continue
pids = pids " " pid
seen[pid]
}
}
END { print substr(pids, 2) }
' )
fi
fi
#
# Find open *file* descriptors
#
if [ ! "$IGNORE_RUNNING$DEBUG" ]; then
info "Gathering open file-descriptor info" \
"(this may take a while)..."
OPEN_FDS=$( run_lsof | awk \
-v comm="$COMM" \
-v debug=${DEBUG:-0} \
-v filter_follow=${FILTER_FOLLOW:-0} \
-v filter_gid="$FILTER_GID" \
-v filter_job="$FILTER_JOB" \
-v filter_pid="$FILTER_PID" \
-v filter_type="$FILTER_TYPE" \
-v filter_user="$FILTER_USER" \
-v follow_pids="$FOLLOW_PIDS" \
-v ignore_pids="$IGNORE_PIDS" \
-v sge_jobs="$SGE_JOBS" \
-v show_paths=${SHOW_PATHS:-0} \
-v silent=${SILENT:-0} \
-v stderr=/dev/stderr \
-v timefmt="$TIME_FMT" \
'####################################### BEGIN
BEGIN {
(cmd = "echo $PPID") | getline mypid
close(cmd)
if (timefmt != "") {
srand()
time = srand()
}
delete follow
nfollow = split(follow_pids, list)
for (n = 1; n <= nfollow; n++) {
follow[list[n]]
}
delete mounts
delete mount_type
file = "/proc/mounts"
nmounts = 0
root_mount = ""
root_mount_type = ""
flen = length(filter_type)
while (getline < file > 0) {
if (filter_type != "" &&
substr($3, 1, flen) != filter_type)
continue
if ($2 == "/") {
root_mount = $2
root_mount_type = $3
} else {
mounts[++nmounts] = $2
sub("/+$", "", mounts[nmounts])
mount_type[nmounts] = $3
}
}
close(file)
if (root_mount != "") {
mounts[++nmounts] = root_mount
mount_type[nmounts] = root_mount_type
}
delete job_pids
njobs = split(sge_jobs, list)
for (n = 1; n <= njobs; n++) {
pid = job_pid = list[n]
sub(/=.*/, "", pid)
sub(/.*=/, "", job_pid)
job_pids[pid] = job_pid
}
delete pids_ignore
nignore = split(ignore_pids, list)
for (n = 1; n <= nignore; n++) {
pid = list[n]
pids_ignore[pid]
}
delete seen
}
######################################## FUNCTIONS
function key(a, b) { return a "," b }
function emit(str)
{
if (debug) return
printf "%s|%s\n", timefmt == "" ? "" : time, str
fflush()
}
function info(str)
{
if (!silent) emit(sprintf("info|%s", str))
}
function warn(str)
{
if (!silent) emit(sprintf("warn|%s", str))
}
function getcol(name, start, width, val)
{
start = startcol[name]
width = colwidth[name]
if (start < 1) return ""
if (name == lastcol)
val = substr($0, start)
else
val = substr($0, start, width)
gsub(/(^[[:space:]]+|[[:space:]]+$)/, "", val)
return val
}
######################################## MAIN
# Header
$1 == "COMMAND" && $2 == "PID" && $NF == "NAME" {
delete cols
delete startcol
delete colwidth
ncol = split($0, cols, /[[:space:]]+/)
for (n = 1; n <= ncol; n++) {
col = cols[n]
if (n == 1) { # First col
# NB: Left-justified
match($0, /^[^ ]+ +/)
startcol[col] = RSTART
colwidth[col] = RLENGTH - 3
} else if (n == 2) { # Second col
# NB: Right-justified
match($0, " " col " ")
startcol[col] = RSTART - 2
colwidth[col] = RLENGTH + 1
} else if (n == ncols) { # Last col
# NB: Left-justified
match($0, / [^ ]+$/)
startcol[col] = RSTART + 1
} else {
# NB: Right-justified
pcol = cols[n - 1]
startcol[col] = startcol[pcol]
startcol[col] += colwidth[pcol] + 1
match($0, " " col " ")
colwidth[col] = RSTART + RLENGTH - 1
colwidth[col] -= startcol[col]
# NB: FD column has 1B tag
if (col == "FD") colwidth[col]++
}
}
lastcol = col
next
}
# Parse fields
{
cmd = getcol("COMMAND")
pid = getcol("PID")
tid = getcol("TID")
user = getcol("USER")
fd = getcol("FD")
type = getcol("TYPE")
dev = getcol("DEVICE")
size = getcol("SIZE/OFF")
node = getcol("NODE")
name = getcol("NAME")
# Treat effects of "lsof +e /"
sub(/^UNKN/, "", type)
sub(" \\(\\+e /\\)$", "", name)
if (pid == mypid) next
if (pid in pids_ignore) next
if (filter_job != "" && !(pid in job_pids)) next
if (fd !~ /^[0-9]/) next
}
name ~ "^/" && type != "DIR" && fd ~ /^[0-9]+[rwu-]?$/ {
sub(/[rwu-]$/, "", fd)
if (key(pid, fd) in seen) next
matched = 0
for (n = 1; n <= nmounts; n++) {
mnt = mounts[n]
mnt_type = mount_type[n]
len = length(mnt)
pre = substr(name, 1, len + 1)
if (mnt == "/" && name ~ "^/")
matched = 1
else if (name == mnt || pre == mnt "/")
matched = 1
if (matched) break
}
if (!matched) next
# follow filter
if (filter_follow && !(pid in follow)) {
next
} else if (!filter_follow) {
# NB: follow_pids should contain all the pids
# that match the below criterion.
# pid filter
if (filter_pid != "" && pid != filter_pid) {
next
}
# comm filter
if (comm != "" && cmd != comm) {
next
}
# user filter
if (filter_user != "" && user != filter_user) {
next
}
# group filter
if (filter_gid != "") {
gid = ""
file = sprintf("/proc/%d/status", pid)
while (getline L < file > 0) {
if (L !~ /^Gid:/) continue
sub(/^Gid:[[:space:]]*/, "", L)
sub(/[^0-9].*/, "", L)
gid = L
break
}
close(file)
if (gid != filter_gid) next
}
}
#
# Send information to post-processor about open
# file-descriptor matching search criterion.
#
if (show_paths) {
emit(sprintf("enter_open|%s|%s|%d|%d|%s|%s",
user, cmd, pid,
pid in job_pids ? job_pids[pid] : 0,
mnt_type, name))
}
emit(sprintf("exit_open|%s|%s|%d|%d|%s|%d|1",
user, cmd, pid,
pid in job_pids ? job_pids[pid] : 0,
mnt_type, fd))