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        (C {<die>} 
          {
            (DQ <'ERROR: ftrace may be in use by PID '> 
              (command_sub
                left_token: <Id.Left_DollarParen '$('>
                child: (C {<cat>} {($ Id.VSub_DollarName '$flock')})
              ) <' '> ($ Id.VSub_DollarName '$flock')
            )
          }
        )
      ]
    )
    (command.AndOr
      ops: [Id.Op_DPipe]
      children: [
        (command.Simple
          words: [{<echo>} {($ Id.VSub_Dollar '$$')}]
          redirects: [
            (redir
              op: <Id.Redir_Great '>'>
              loc: (redir_loc.Fd fd:1)
              arg: {($ Id.VSub_DollarName '$flock')}
            )
          ]
          do_fork: T
        )
        (C {<die>} {(DQ <'ERROR: unable to write '> ($ Id.VSub_DollarName '$flock') <.>)})
      ]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:wroteflock)
          op: assign_op.Equal
          rhs: {<1>}
          spids: [940]
        )
      ]
    )
    (C {<sysctl>} {<-q>} {<kernel.ftrace_enabled> <Id.Lit_Equals '='> <1>})
    (command.Simple
      words: [{<read>} {<mode>}]
      redirects: [(redir op:<Id.Redir_Less '<'> loc:(redir_loc.Fd fd:0) arg:{<current_tracer>})]
      do_fork: T
    )
    (command.AndOr
      ops: [Id.Op_DAmp]
      children: [
        (command.DBracket
          expr: 
            (bool_expr.Binary
              op_id: Id.BoolBinary_GlobNEqual
              left: {(DQ ($ Id.VSub_DollarName '$mode'))}
              right: {(DQ <nop>)}
            )
        )
        (C {<edie>} 
          {(DQ <'ERROR: ftrace active (current_tracer='> ($ Id.VSub_DollarName '$mode') <')'>)}
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: 
            (condition.Shell
              commands: [
                (command.Sentence
                  child: 
                    (command.Pipeline
                      children: [
                        (command.Simple
                          words: [{<echo>} {($ Id.VSub_DollarName '$thresh')}]
                          redirects: [
                            (redir
                              op: <Id.Redir_Great '>'>
                              loc: (redir_loc.Fd fd:1)
                              arg: {<tracing_thresh>}
                            )
                          ]
                          do_fork: T
                        )
                      ]
                      negated: T
                    )
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (C {<edie>} 
              {
                (DQ <'ERROR: setting tracing_thresh to '> ($ Id.VSub_DollarName '$thresh') 
                  <'. Exiting.'>
                )
              }
            )
          ]
          spids: [990 1003]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: 
            (condition.Shell
              commands: [
                (command.Sentence
                  child: (command.DParen child:<Id.Lit_ArithVarLike opt_pid>)
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (command.Simple
              words: [{<echo>} {(SQ )}]
              redirects: [
                (redir
                  op: <Id.Redir_Great '>'>
                  loc: (redir_loc.Fd fd:1)
                  arg: {<set_ftrace_pid>}
                )
              ]
              do_fork: T
            )
            (command.ForEach
              iter_name: tid
              iter_words: [{<'/proc/'> ($ Id.VSub_DollarName '$pid') <'/task/'> <Id.Lit_Star '*'>}]
              do_arg_iter: F
              body: 
                (command.DoGroup
                  children: [
                    (command.If
                      arms: [
                        (if_arm
                          cond: 
                            (condition.Shell
                              commands: [
                                (command.Sentence
                                  child: 
                                    (command.Pipeline
                                      children: [
                                        (command.Simple
                                          words: [
                                            {<echo>}
                                            {
                                              (braced_var_sub
                                                token: <Id.VSub_Name tid>
                                                suffix_op: 
                                                  (suffix_op.Unary
                                                    tok: <Id.VOp1_DPound '##'>
                                                    arg_word: {<Id.Lit_Other '*'> <Id.Lit_Slash '/'>}
                                                  )
                                              )
                                            }
                                          ]
                                          redirects: [
                                            (redir
                                              op: <Id.Redir_DGreat '>>'>
                                              loc: (redir_loc.Fd fd:1)
                                              arg: {<set_ftrace_pid>}
                                            )
                                          ]
                                          do_fork: T
                                        )
                                      ]
                                      negated: T
                                    )
                                  terminator: <Id.Op_Semi _>
                                )
                              ]
                            )
                          action: [
                            (C {<edie>} 
                              {
                                (DQ <'ERROR: setting -p '> ($ Id.VSub_DollarName '$pid') 
                                  <' (PID exist?). Exiting.'>
                                )
                              }
                            )
                          ]
                          spids: [1058 1076]
                        )
                      ]
                    )
                  ]
                )
            )
          ]
          spids: [1016 1026]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: 
            (condition.Shell
              commands: [
                (command.Sentence
                  child: (command.DParen child:<Id.Lit_ArithVarLike opt_tid>)
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (command.If
              arms: [
                (if_arm
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: 
                            (command.Pipeline
                              children: [
                                (command.Simple
                                  words: [{<echo>} {($ Id.VSub_DollarName '$tid')}]
                                  redirects: [
                                    (redir
                                      op: <Id.Redir_Great '>'>
                                      loc: (redir_loc.Fd fd:1)
                                      arg: {<set_ftrace_pid>}
                                    )
                                  ]
                                  do_fork: T
                                )
                              ]
                              negated: T
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [
                    (C {<edie>} 
                      {
                        (DQ <'ERROR: setting -L '> ($ Id.VSub_DollarName '$tid') 
                          <' (TID exist?). Exiting.'>
                        )
                      }
                    )
                  ]
                  spids: [1108 1121]
                )
              ]
            )
          ]
          spids: [1095 1105]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: 
            (condition.Shell
              commands: [
                (command.Sentence
                  child: 
                    (command.Pipeline
                      children: [
                        (command.Simple
                          words: [{<echo>} {(DQ ($ Id.VSub_DollarName '$funcs'))}]
                          redirects: [
                            (redir
                              op: <Id.Redir_Great '>'>
                              loc: (redir_loc.Fd fd:1)
                              arg: {<set_ftrace_filter>}
                            )
                          ]
                          do_fork: T
                        )
                      ]
                      negated: T
                    )
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (C {<edie>} 
              {
                (DQ <'ERROR: enabling '> (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'>) 
                  ($ Id.VSub_DollarName '$funcs') (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'>) <' filter. Function exist? Exiting.'>
                )
              }
            )
          ]
          spids: [1137 1152]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: 
            (condition.Shell
              commands: [
                (command.Sentence
                  child: 
                    (command.Pipeline
                      children: [
                        (command.Simple
                          words: [{<echo>} {(DQ ($ Id.VSub_DollarName '$funcs'))}]
                          redirects: [
                            (redir
                              op: <Id.Redir_Great '>'>
                              loc: (redir_loc.Fd fd:1)
                              arg: {<set_graph_function>}
                            )
                          ]
                          do_fork: T
                        )
                      ]
                      negated: T
                    )
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (C {<edie>} 
              {
                (DQ <'ERROR: enabling '> (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'>) 
                  ($ Id.VSub_DollarName '$funcs') (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'>) <' graph. Exiting.'>
                )
              }
            )
          ]
          spids: [1167 1182]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: 
            (condition.Shell
              commands: [
                (command.Sentence
                  child: 
                    (command.Pipeline
                      children: [
                        (command.Simple
                          words: [{<echo>} {<function_graph>}]
                          redirects: [
                            (redir
                              op: <Id.Redir_Great '>'>
                              loc: (redir_loc.Fd fd:1)
                              arg: {<current_tracer>}
                            )
                          ]
                          do_fork: T
                        )
                      ]
                      negated: T
                    )
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (C {<edie>} 
              {
                (DQ <'ERROR: setting current_tracer to '> 
                  (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'>) <function_graph> (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'>) <'. Exiting.'>
                )
              }
            )
          ]
          spids: [1197 1210]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: 
            (condition.Shell
              commands: [
                (command.Sentence
                  child: (command.DParen child:<Id.Lit_ArithVarLike opt_cpu>)
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (command.If
              arms: [
                (if_arm
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: 
                            (command.Pipeline
                              children: [
                                (command.Simple
                                  words: [{<echo>} {<nosleep-time>}]
                                  redirects: [
                                    (redir
                                      op: <Id.Redir_Great '>'>
                                      loc: (redir_loc.Fd fd:1)
                                      arg: {<trace_options>}
                                    )
                                  ]
                                  do_fork: T
                                )
                              ]
                              negated: T
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [(C {<edie>} {(DQ <'ERROR: setting -C (nosleep-time). Exiting.'>)})]
                  spids: [1238 1251]
                )
              ]
            )
          ]
          spids: [1225 1235]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: 
            (condition.Shell
              commands: [
                (command.Sentence
                  child: (command.DParen child:<Id.Lit_ArithVarLike opt_time>)
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (command.If
              arms: [
                (if_arm
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: 
                            (command.Pipeline
                              children: [
                                (command.Simple
                                  words: [{<echo>} {<funcgraph-abstime>}]
                                  redirects: [
                                    (redir
                                      op: <Id.Redir_Great '>'>
                                      loc: (redir_loc.Fd fd:1)
                                      arg: {<trace_options>}
                                    )
                                  ]
                                  do_fork: T
                                )
                              ]
                              negated: T
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [(C {<edie>} {(DQ <'ERROR: setting -t (funcgraph-abstime). Exiting.'>)})]
                  spids: [1281 1294]
                )
              ]
            )
          ]
          spids: [1268 1278]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: 
            (condition.Shell
              commands: [
                (command.Sentence
                  child: (command.DParen child:<Id.Lit_ArithVarLike opt_proc>)
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (command.If
              arms: [
                (if_arm
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: 
                            (command.Pipeline
                              children: [
                                (command.Simple
                                  words: [{<echo>} {<funcgraph-proc>}]
                                  redirects: [
                                    (redir
                                      op: <Id.Redir_Great '>'>
                                      loc: (redir_loc.Fd fd:1)
                                      arg: {<trace_options>}
                                    )
                                  ]
                                  do_fork: T
                                )
                              ]
                              negated: T
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [(C {<edie>} {(DQ <'ERROR: setting -P (funcgraph-proc). Exiting.'>)})]
                  spids: [1321 1334]
                )
              ]
            )
          ]
          spids: [1308 1318]
        )
      ]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:cat)
          op: assign_op.Equal
          rhs: {<cat>}
          spids: [1352]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: 
            (condition.Shell
              commands: [
                (command.Sentence
                  child: (command.DParen child:<Id.Lit_ArithVarLike opt_proc>)
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:cat)
                  op: assign_op.Equal
                  rhs: 
                    {($ Id.VSub_DollarName '$awk') 
                      (SQ <' "/(^ ---|^$)/ || \\$3 == \\"=>\\" { next } { print \\$0 }"'>)
                    }
                  spids: [1388]
                )
              ]
            )
          ]
          spids: [1355 1365]
        )
      ]
    )
    (C {<warn>} {(DQ <'echo > trace'>)})
    (command.If
      arms: [
        (if_arm
          cond: 
            (condition.Shell
              commands: [
                (command.Sentence
                  child: (command.DParen child:<Id.Lit_ArithVarLike opt_duration>)
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (C {<sleep>} {($ Id.VSub_DollarName '$duration')})
            (command.If
              arms: [
                (if_arm
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: (command.DParen child:<Id.Lit_ArithVarLike opt_headers>)
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [(C {($ Id.VSub_DollarName '$cat')} {<trace>})]
                  spids: [1424 1434]
                )
              ]
              else_action: [
                (command.Pipeline
                  children: [
                    (C {($ Id.VSub_DollarName '$cat')} {<trace>})
                    (C {<grep>} {<-v>} {(SQ <'^#'>)})
                  ]
                  negated: F
                )
              ]
            )
          ]
          spids: [1406 1416]
        )
      ]
      else_action: [
        (command.AndOr
          ops: [Id.Op_DAmp]
          children: [(command.DParen child:<Id.Lit_ArithVarLike opt_headers>) (C {<cat>} {<trace>})]
        )
        (C {<eval>} {($ Id.VSub_DollarName '$cat')} {<trace_pipe>})
      ]
    )
    (C {<end>})
  ]
)