| 1 | #!/bin/sh
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| 2 | #
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| 3 | # This script lists what mythbackend is polling on.
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| 4 | #
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| 5 | PATH=/files2/home/ali/wk/myth:$PATH
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| 6 | if [ -f /var/run/mythbackend.pid ]; then
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| 7 | pid=`cat /var/run/mythbackend.pid` || exit 1
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| 8 | else
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| 9 | echo Myth backend not running
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| 10 | exit 1
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| 11 | fi
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| 12 | if [ -d /proc/$pid/task ]; then
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| 13 | polling=`fgrep -lx poll_schedule_timeout /proc/$pid/task/*/wchan | \
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| 14 | sed -e 's:.*/task/\([0-9]*\)/wchan:\1:'`
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| 15 | else
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| 16 | echo Myth backend not running
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| 17 | exit 1
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| 18 | fi
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| 19 | fds_to_list=`mktemp`
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| 20 | for task in $polling; do
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| 21 | read callno arg0 arg1 arg2 arg3 arg4 arg5 sp pc < /proc/$task/syscall
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| 22 | # syscall numbers are in /usr/include/syscall.h
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| 23 | # NB: We should support ppoll, epoll and pselect (and others?),
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| 24 | # but mythbackend doesn't seem to use them.
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| 25 | case $callno in
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| 26 | 7)
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| 27 | if [ "$arg0" = "0x0" ]; then
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| 28 | fds=$arg0
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| 29 | else
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| 30 | fds="[`read_mem -t pollfd $pid $arg0 $arg1`]"
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| 31 | read_mem -t pollfd $pid $arg0 $arg1 | \
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| 32 | sed -n -e 's/.*{fd=\([1-9][0-9]*\),.*/\1/p' >> $fds_to_list
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| 33 | fi
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| 34 | echo $task: poll fds=$fds nfds=$arg1
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| 35 | ;;
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| 36 | 23)
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| 37 | if [ "$arg1" = "0x0" ]; then
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| 38 | readfds=$arg1
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| 39 | else
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| 40 | readfds=`read_mem -t fdset $pid $arg1 1`
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| 41 | echo $readfds | sed -n -e 's/.*\[\(.*\)\].*/\1/p' | \
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| 42 | tr ' ' '\012' >> $fds_to_list
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| 43 | fi
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| 44 | if [ "$arg2" = "0x0" ]; then
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| 45 | writefds=$arg2
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| 46 | else
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| 47 | writefds=`read_mem -t fdset $pid $arg2 1`
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| 48 | echo $writefds | sed -n -e 's/.*\[\(.*\)\].*/\1/p' | \
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| 49 | tr ' ' '\012' >> $fds_to_list
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| 50 | fi
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| 51 | if [ "$arg3" = "0x0" ]; then
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| 52 | exceptfds=$arg3
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| 53 | else
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| 54 | exceptfds=`read_mem -t fdset $pid $arg3 1`
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| 55 | echo $exceptfds | sed -n -e 's/.*\[\(.*\)\].*/\1/p' | \
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| 56 | tr ' ' '\012' >> $fds_to_list
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| 57 | fi
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| 58 | echo $task: select nfds=$arg0 readfds=$readfds writefds=$writefds \
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| 59 | exceptfds=$exceptfds
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| 60 | ;;
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| 61 | 219)
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| 62 | echo $task: restart_syscall
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| 63 | ;;
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| 64 | running)
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| 65 | # task is no longer waiting in a syscall
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| 66 | ;;
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| 67 | *)
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| 68 | echo $task: syscall no $callno
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| 69 | ;;
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| 70 | esac
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| 71 | done
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| 72 | fds=`sort -n -u $fds_to_list | tr '\012' ',' | sed -e 's/^,//' -e 's/,$//'`
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| 73 | lsof -p $pid -a -d $fds
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| 74 | rm $fds_to_list
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