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#!/bin/bash # # Resource limiting wrapper for command execution # Clean up cgroup cleanup() { # First we have to move the current task into a "garbage" group, otherwise # the cgroup will not be empty, and attempting to remove it will fail with # "Device or resource busy" if [ -w "$SB_CGROUP"/tasks ]; then GARBAGE="$SB_CGROUP" else GARBAGE="$SB_CGROUP"/garbage-`id -un` if [ ! -e "$GARBAGE" ]; then mkdir -m 0700 "$GARBAGE" fi fi echo $BASHPID > "$GARBAGE"/tasks # Suppress errors in case the cgroup has disappeared due to a release script rmdir "$SB_CGROUP"/$$ 2>/dev/null } updateTaskCount() { # There are lots of ways to count lines in a file in shell script, but this # is one of the few that doesn't create another process, which would # increase the returned number of tasks. readarray < "$SB_CGROUP"/$$/tasks NUM_TASKS=${#MAPFILE[]} } log() { echo limit.sh: "$" >&3 echo limit.sh: "$*" >&2 } SB_INCLUDE_STDERR= SB_USE_LOG_PIPE= SB_CPU_LIMIT=0 SB_CGROUP= SB_MEM_LIMIT=0 SB_FILE_SIZE_LIMIT=0 SB_WALL_CLOCK_LIMIT=0 # Override settings eval "$2" if [ -n "$SB_INCLUDE_STDERR" ]; then exec 2>&1 fi if [ -z "$SB_USE_LOG_PIPE" ]; then # Open a dummy log FD exec 3>/dev/null fi if [ "$SB_CPU_LIMIT" -gt 0 ]; then ulimit -t "$SB_CPU_LIMIT" fi if [ "$SB_MEM_LIMIT" -gt 0 ]; then if [ -n "$SB_CGROUP" ]; then # Create cgroup if ! mkdir -m 0700 "$SB_CGROUP"/$$; then log "failed to create the cgroup." SB_CGROUP="" fi fi if [ -n "$SB_CGROUP" ]; then echo $$ > "$SB_CGROUP"/$$/tasks if [ -n "$SB_CGROUP_NOTIFY" ]; then echo "1" > "$SB_CGROUP"/$$/notify_on_release fi # Memory echo $SB_MEM_LIMIT > "$SB_CGROUP"/$$/memory.limit_in_bytes # Memory+swap # This will be missing if there is no swap if [ -e "$SB_CGROUP"/$$/memory.memsw.limit_in_bytes ]; then echo $SB_MEM_LIMIT > "$SB_CGROUP"/$$/memory.memsw.limit_in_bytes fi fi else SB_CGROUP="" fi if [ "$SB_FILE_SIZE_LIMIT" -gt 0 ]; then ulimit -f "$SB_FILE_SIZE_LIMIT" fi if [ "$SB_WALL_CLOCK_LIMIT" -gt 0 -a -x "/usr/bin/timeout" ]; then /usr/bin/timeout $SB_WALL_CLOCK_LIMIT /bin/bash -c "$1" 3>&- STATUS="$?" if [ "$STATUS" == 124 ]; then log "timed out executing command \"$1\"" fi else eval "$1" 3>&- STATUS="$?" fi if [ -n "$SB_CGROUP" ]; then updateTaskCount if [ $NUM_TASKS -gt 1 ]; then # Spawn a monitor process which will continue to poll for completion # of all processes in the cgroup after termination of the parent shell ( while [ $NUM_TASKS -gt 1 ]; do sleep 10 updateTaskCount done cleanup ) >&/dev/null < /dev/null 3>&- & disown -a else cleanup fi fi exit "$STATUS"

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