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                  op: Equal
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                  op: Equal
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                )
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                  op: Equal
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                )
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                  op: Equal
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                )
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        (command.Assignment
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              op: Equal
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        (assign_pair
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          op: Equal
          rhs: {(events/syscalls/sys_enter_kill)}
          spids: [195]
        )
      ]
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    )
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      keyword: Assign_None
      pairs: [
        (assign_pair
          lhs: (lhs_expr.LhsName name:kevent_return spids:[198])
          op: Equal
          rhs: {(events/syscalls/sys_exit_kill)}
          spids: [198]
        )
      ]
      spids: [198]
    )
    (C {(trap)} {(SQ <':'>)} {(INT)} {(QUIT)} {(TERM)} {(PIPE)} {(HUP)})
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      name: usage
      body: 
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            (command.SimpleCommand
              words: [{(cat)}]
              redirects: [
                (redir.HereDoc
                  op: <Redir_DLessDash '<<-'>
                  fd: 16777215
                  here_begin: {(END)}
                  here_end_span_id: 250
                  stdin_parts: [
                    ('USAGE: killsnoop [-hst] [-d secs] [-p PID] [-n name] [filename]\n')
                    ('                 -d seconds      # trace duration, and use buffers\n')
                    ('                 -n name         # process name to match \n')
                    ('                 -p PID          # PID to match on kill issue\n')
                    ('                 -t              # include time (seconds)\n')
                    ('                 -s              # human readable signal names\n')
                    ('                 -h              # this usage message\n')
                    ('  eg,\n')
                    ('       killsnoop                 # watch kill()s live (unbuffered)\n')
                    ('       killsnoop -d 1            # trace 1 sec (buffered)\n')
                    ('       killsnoop -p 181          # trace kill()s issued to PID 181 only\n')
                    ('\n')
                    ('See the man page and example file for more info.\n')
                  ]
                )
                (redir.Redir op:<Redir_GreatAnd '>&'> fd:16777215 arg_word:{(2)})
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            )
            (command.ControlFlow token:<ControlFlow_Exit exit>)
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          spids: [225]
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                        {
                          (DQ ('WARNING: command failed ') 
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                      ]
                      redirects: [(redir.Redir op:<Redir_GreatAnd '>&'> fd:16777215 arg_word:{(2)})]
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                  spids: [16777215 275]
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              spids: [16777215 291]
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          spids: [261]
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    )
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              redirects: [(redir.Redir op:<Redir_Great '2>'> fd:2 arg_word:{(/dev/null)})]
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            (C {(warn)} {(DQ ('echo 0 > ') ($ VSub_DollarName '$kevent_entry') (/enable))})
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            (C {(warn)} {(DQ ('echo > trace'))})
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                )
                (C {(warn)} {(DQ ('rm ') ($ VSub_DollarName '$flock'))})
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          ]
          spids: [300]
        )
      spids: [296 299]
    )
    (command.FuncDef
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            (command.ControlFlow token:<ControlFlow_Exit exit> arg_word:{(1)})
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            (command.SimpleCommand
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                (redir.Redir op:<Redir_Great '>'> fd:16777215 arg_word:{(/dev/null)})
                (redir.Redir op:<Redir_GreatAnd '2>&'> fd:2 arg_word:{(1)})
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            )
            (C {(end)})
            (command.ControlFlow token:<ControlFlow_Exit exit> arg_word:{(1)})
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          spids: [400]
        )
      spids: [396 399]
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                (case_arm
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                            )
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                          spids: [466]
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                    (command.Assignment
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                        (assign_pair
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                          op: Equal
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                        (assign_pair
                          lhs: (lhs_expr.LhsName name:opt_time spids:[505])
                          op: Equal
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                        )
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                  spids: [502 503 508 16777215]
                )
                (case_arm
                  pat_list: [{(s)}]
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                      pairs: [
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                          lhs: (lhs_expr.LhsName name:opt_fancy spids:[514])
                          op: Equal
                          rhs: {(1)}
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                  spids: [511 512 517 16777215]
                )
                (case_arm
                  pat_list: [{(h)} {(Lit_Other '?')}]
                  action: [(C {(usage)})]
                  spids: [520 523 527 16777215]
                )
              ]
              spids: [456 460 530]
            )
          ]
          spids: [453 532]
        )
    )
    (C {(shift)} 
      {
        (word_part.ArithSubPart
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            (arith_expr.ArithBinary
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          spids: [536 545]
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          spids: [562 571]
        )
        (C {(die)} {(DQ ('ERROR: use either -p or -n.'))})
      ]
    )
    (command.AndOr
      ops: [Op_DAmp]
      children: [
        (command.DParen
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              lhs: (lhs_expr.LhsName name:ftext spids:[605])
              op: Equal
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                {
                  (DQ (' issued by process name ') 
                    (word_part.EscapedLiteralPart token:<Lit_EscapedChar '\\"'>) ($ VSub_DollarName '$name') (word_part.EscapedLiteralPart token:<Lit_EscapedChar '\\"'>)
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          ]
          action: [
            (C {(echo)} 
              {
                (DQ ('Tracing kill()s') ($ VSub_DollarName '$ftext') (' for ') 
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          ]
          spids: [16777215 623]
        )
      ]
      else_action: [
        (C {(echo)} {(DQ ('Tracing kill()s') ($ VSub_DollarName '$ftext') ('. Ctrl-C to end.'))})
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      spids: [636 647]
    )
    (command.AndOr
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      children: [
        (command.DBracket expr:(bool_expr.BoolUnary op_id:BoolUnary_x child:{(/usr/bin/mawk)}))
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            (assign_pair
              lhs: (lhs_expr.LhsName name:awk spids:[666])
              op: Equal
              rhs: {(DQ (mawk))}
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            )
          ]
          spids: [666]
        )
        (C {(mawk)} {(-W)} {(interactive)})
        (C {(Lit_Other '[')} {($ VSub_QMark '$?')} {(-eq)} {(0)} {(Lit_Other ']')})
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          keyword: Assign_None
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            (assign_pair
              lhs: (lhs_expr.LhsName name:awk spids:[694])
              op: Equal
              rhs: {(DQ ('mawk -W interactive'))}
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          ]
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        )
      ]
    )
    (command.AndOr
      ops: [Op_DAmp]
      children: [
        (command.DBracket expr:(bool_expr.BoolUnary op_id:BoolUnary_x child:{(/usr/bin/gawk)}))
        (command.Assignment
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              lhs: (lhs_expr.LhsName name:awk spids:[712])
              op: Equal
              rhs: {(DQ ('gawk --non-decimal-data'))}
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            )
          ]
          spids: [712]
        )
      ]
    )
    (command.AndOr
      ops: [Op_DPipe]
      children: [
        (C {(cd)} {($ VSub_DollarName '$tracing')})
        (C {(die)} 
          {
            (DQ ('ERROR: accessing tracing. Root user? Kernel has FTRACE?\n') 
              ('    debugfs mounted? (mount -t debugfs debugfs /sys/kernel/debug)')
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    )
    (command.AndOr
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      children: [
        (command.DBracket
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        (C {(die)} 
          {
            (DQ ('ERROR: ftrace may be in use by PID ') 
              (word_part.CommandSubPart
                command_list: 
                  (command.CommandList
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                left_token: <Left_CommandSub '$('>
                spids: [752 756]
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      ops: [Op_DPipe]
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        (command.SimpleCommand
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        )
        (C {(die)} {(DQ ('ERROR: unable to write ') ($ VSub_DollarName '$flock') (.))})
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      pairs: [
        (assign_pair
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          rhs: {(1)}
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                  negated: T
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          ]
          action: [(C {(edie)} {(DQ ('ERROR: enabling kill() entry tracepoint Exiting.'))})]
          spids: [16777215 808]
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                  negated: T
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          ]
          action: [(C {(edie)} {(DQ ('ERROR: enabling kill() return tracepoint. Exiting.'))})]
          spids: [16777215 833]
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      ops: [Op_DAmp]
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        (command.DParen
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          spids: [844 849]
        )
        (C {(printf)} {(DQ ('%-16s '))} {(DQ (TIMEs))})
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    )
    (C {(printf)} {(DQ ('%-16.16s %-6s %-8s %-10s %4s') (Lit_Other '\\') (n))} {(DQ (COMM))} {(DQ (PID))} 
      {(DQ (TPID))} {(DQ (SIGNAL))} {(DQ (RETURN))}
    )
    (command.Assignment
      keyword: Assign_None
      pairs: [
        (assign_pair
          lhs: (lhs_expr.LhsName name:offset spids:[913])
          op: Equal
          rhs: 
            {
              (word_part.CommandSubPart
                command_list: 
                  (command.CommandList
                    children: [
                      (C {($ VSub_DollarName '$awk')} 
                        {
                          (SQ <'BEGIN { o = 0; }\n'> 
                            <'    $1 == "#" && $2 ~ /TASK/ && NF == 6 { o = 1; }\n'> <'    $2 ~ /TASK/ { print o; exit }'>
                          )
                        } {(trace)}
                      )
                    ]
                  )
                left_token: <Left_CommandSub '$('>
                spids: [914 924]
              )
            }
          spids: [913]
        )
      ]
      spids: [913]
    )
    (C {(warn)} {(DQ ('echo > trace'))})
    (command.Pipeline
      children: [
        (command.Subshell
          child: 
            (command.If
              arms: [
                (if_arm
                  cond: [
                    (command.Sentence
                      child: 
                        (command.DParen
                          child: (arith_expr.ArithVarRef token:<Lit_ArithVarLike opt_duration>)
                          spids: [940 945]
                        )
                      terminator: <Op_Semi ';'>
                    )
                  ]
                  action: [(C {(sleep)} {($ VSub_DollarName '$duration')}) (C {(cat)} {(trace)})]
                  spids: [16777215 948]
                )
              ]
              else_action: [(C {(cat)} {(trace_pipe)})]
              spids: [964 975]
            )
          spids: [936 977]
        )
        (C {($ VSub_DollarName '$awk')} {(-v)} {(Lit_VarLike 'o=') ($ VSub_DollarName '$offset')} {(-v)} 
          {(Lit_VarLike 'opt_name=') ($ VSub_DollarName '$opt_name')} {(-v)} {(Lit_VarLike 'name=') ($ VSub_DollarName '$name')} {(-v)} 
          {(Lit_VarLike 'opt_duration=') ($ VSub_DollarName '$opt_duration')} {(-v)} {(Lit_VarLike 'opt_time=') ($ VSub_DollarName '$opt_time')} {(-v)} 
          {(Lit_VarLike 'opt_pid=') ($ VSub_DollarName '$pid')} {(-v)} {(Lit_VarLike 'opt_fancy=') ($ VSub_DollarName '$opt_fancy')} 
          {
            (SQ <'\n'> <'    # fancy signal names\n'> <'    BEGIN {\n'> 
              <'        signals[1] = "SIGHUP"\n'> <'        signals[2] = "SIGINT"\n'> <'        signals[3] = "SIGQUIT"\n'> 
              <'        signals[4] = "SIGILL"\n'> <'        signals[6] = "SIGABRT"\n'> <'        signals[8] = "SIGFPE"\n'> 
              <'        signals[9] = "SIGKILL"\n'> <'        signals[11] = "SIGSEGV"\n'> <'        signals[13] = "SIGPIPE"\n'> 
              <'        signals[14] = "SIGALRM"\n'> <'        signals[15] = "SIGTERM"\n'> <'        signals[10] = "SIGUSR1"\n'> 
              <'        signals[12] = "SIGUSR2"\n'> <'        signals[17] = "SIGCHLD"\n'> <'        signals[18] = "SIGCONT"\n'> 
              <'        signals[19] = "SIGSTOP"\n'> <'        signals[20] = "SIGTSTP"\n'> <'        signals[21] = "SIGTTIN"\n'> 
              <'        signals[22] = "SIGTTOU"\n'> <'    }\n'> <'\n'> <'    # common fields\n'> <'    $1 != "#" {\n'> 
              <'        # task name can contain dashes\n'> <'        comm = pid = $1\n'> <'        sub(/-[0-9][0-9]*/, "", comm)\n'> 
              <'        if (opt_name && match(comm, name) == 0)\n'> <'            next\n'> <'        sub(/.*-/, "", pid)\n'> <'    }\n'> <'\n'> <'    # sys_kill() entry\n'> 
              <'    $1 != "#" && $(4+o) ~ /sys_kill/ && $(5+o) !~ /->/ {\n'> <'        #\n'> <'        # eg: ... sys_kill(pid:...\n'> <'        #\n'> <'        kpid = $(5+o)\n'> 
              <'        signal = $(7+o)\n'> <'        sub(/,$/, "", kpid)\n'> <'        sub(/\\)$/, "", signal)\n'> 
              <'        kpid = int("0x"kpid)\n'> <'        signal = int("0x"signal)\n'> <'        current[pid,"kpid"] = kpid\n'> 
              <'        current[pid,"signal"] = signal\n'> <'    }\n'> <'\n'> <'    # sys_kill exit\n'> <'    $1 != "#" && $(5+o) ~ /->/ {\n'> 
              <'        rv = int($NF)\n'> <'        killed_pid = current[pid,"kpid"]\n'> <'        signal = current[pid,"signal"]\n'> <'\n'> 
              <'        delete current[pid,"kpid"]\n'> <'        delete current[pid,"signal"]\n'> <'\n'> <'        if(opt_pid && killed_pid != opt_pid) {\n'> 
              <'            next\n'> <'        }\n'> <'\n'> <'        if (opt_time) {\n'> <'            time = $(3+o); sub(":", "", time)\n'> 
              <'            printf "%-16s ", time\n'> <'        }\n'> <'\n'> <'        if (opt_fancy) {\n'> <'            if (signals[signal] != "") {\n'> 
              <'                signal = signals[signal]\n'> <'            }\n'> <'        }\n'> <'\n'> 
              <
'        printf "%-16.16s %-6s %-8s %-10s %-4s\\n", comm, pid, killed_pid, signal,\n'
              > <'            rv\n'> <'    }\n'> <'\n'> 
              <'    $0 ~ /LOST.*EVENTS/ { print "WARNING: " $0 > "/dev/stderr" }\n'>
            )
          }
        )
      ]
      negated: F
    )
    (C {(end)})
  ]
)