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                        <'                 -n name         # process name to match \n'>
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                        <'                 -t              # include time (seconds)\n'>
                        <'                 -s              # human readable signal names\n'>
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                        <
'       killsnoop -p 181          # trace kill()s issued to PID 181 only\n'
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                          child: (command.DParen child:<Id.Lit_ArithVarLike opt_duration>)
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [(C {<sleep>} {($ Id.VSub_DollarName '$duration')}) (C {<cat>} {<trace>})]
                  spids: [938 948]
                )
              ]
              else_action: [(C {<cat>} {<trace_pipe>})]
            )
        )
        (C {($ Id.VSub_DollarName '$awk')} {<-v>} 
          {<Id.Lit_VarLike 'o='> ($ Id.VSub_DollarName '$offset')} {<-v>} {<Id.Lit_VarLike 'opt_name='> ($ Id.VSub_DollarName '$opt_name')} {<-v>} 
          {<Id.Lit_VarLike 'name='> ($ Id.VSub_DollarName '$name')} {<-v>} {<Id.Lit_VarLike 'opt_duration='> ($ Id.VSub_DollarName '$opt_duration')} {<-v>} 
          {<Id.Lit_VarLike 'opt_time='> ($ Id.VSub_DollarName '$opt_time')} {<-v>} {<Id.Lit_VarLike 'opt_pid='> ($ Id.VSub_DollarName '$pid')} {<-v>} 
          {<Id.Lit_VarLike 'opt_fancy='> ($ Id.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>})
  ]
)