(command.CommandList children: [ (command.ShAssignment pairs: [ (assign_pair lhs: (sh_lhs_expr.Name name:tracing) op: Equal rhs: {(/sys/kernel/debug/tracing)} ) ] ) (command.CommandList children: [ (command.Sentence child: (command.ShAssignment pairs: [ (assign_pair lhs: (sh_lhs_expr.Name name:flock) op: Equal rhs: {(/var/tmp/.ftrace-lock)} ) ] ) terminator: <Op_Semi ';'> ) (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:wroteflock) op:Equal rhs:{(0)})] ) ] ) (command.CommandList children: [ (command.Sentence child: (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:opt_duration) op:Equal rhs:{(0)})] ) terminator: <Op_Semi ';'> ) (command.Sentence child: (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:duration) op:Equal rhs:(word.Empty))] ) terminator: <Op_Semi ';'> ) (command.Sentence child: (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:opt_pid) op:Equal rhs:{(0)})] ) terminator: <Op_Semi ';'> ) (command.Sentence child: (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:pid) op:Equal rhs:(word.Empty))] ) terminator: <Op_Semi ';'> ) (command.Sentence child: (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:opt_tid) op:Equal rhs:{(0)})] ) terminator: <Op_Semi ';'> ) (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:tid) op:Equal rhs:(word.Empty))] ) ] ) (command.CommandList children: [ (command.Sentence child: (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:opt_filter) op:Equal rhs:{(0)})] ) terminator: <Op_Semi ';'> ) (command.Sentence child: (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:filter) op:Equal rhs:(word.Empty))] ) terminator: <Op_Semi ';'> ) (command.Sentence child: (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:opt_view) op:Equal rhs:{(0)})] ) terminator: <Op_Semi ';'> ) (command.Sentence child: (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:opt_headers) op:Equal rhs:{(0)})] ) terminator: <Op_Semi ';'> ) (command.Sentence child: (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:opt_stack) op:Equal rhs:{(0)})] ) terminator: <Op_Semi ';'> ) (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:dmesg) op:Equal rhs:{(2)})] ) ] ) (command.CommandList children: [ (command.Sentence child: (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:debug) op:Equal rhs:{(0)})] ) terminator: <Op_Semi ';'> ) (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:opt_force) op:Equal rhs:{(0)})] ) ] ) (C {(trap)} {(SQ <':'>)} {(INT)} {(QUIT)} {(TERM)} {(PIPE)} {(HUP)}) (command.ShFunction name: usage body: (command.BraceGroup children: [ (command.Simple words: [{(cat)}] redirects: [ (redir.HereDoc op: <Redir_DLessDash '<<-'> fd: 16777215 here_begin: {(END)} here_end_span_id: 286 stdin_parts: [ ( 'USAGE: kprobe [-FhHsv] [-d secs] [-p PID] [-L TID] kprobe_definition [filter]\n' ) (' -F # force. trace despite warnings.\n') (' -d seconds # trace duration, and use buffers\n') (' -p PID # PID to match on events\n') (' -L TID # thread id to match on events\n') (" -v # view format file (don't trace)\n") (' -H # include column headers\n') (' -s # show kernel stack traces\n') (' -h # this usage message\n') ('\n') ('Note that these examples may need modification to match your kernel\n') ("version's function names and platform's register usage.\n") (' eg,\n') (' kprobe p:do_sys_open\n') (' # trace open() entry\n') (' kprobe r:do_sys_open\n') (' # trace open() return\n') (" kprobe 'r:do_sys_open ") (word_part.EscapedLiteral token:<Lit_EscapedChar '\\$'>) ("retval'\n") (' # trace open() return value\n') (" kprobe 'r:myopen do_sys_open ") (word_part.EscapedLiteral token:<Lit_EscapedChar '\\$'>) ("retval'\n") (' # use a custom probe name\n') (" kprobe 'p:myopen do_sys_open mode=%cx:u16'\n") (' # trace open() file mode\n') (" kprobe 'p:myopen do_sys_open filename=+0(%si):string'\n") (' # trace open() with filename\n') (" kprobe -s 'p:myprobe tcp_retransmit_skb'\n") (' # show kernel stacks\n') (" kprobe 'p:do_sys_open file=+0(%si):string' 'file ~ ") (Right_DoubleQuote '"') ('*stat') (Right_DoubleQuote '"') ("'\n") (' # opened files ending in ') (Right_DoubleQuote '"') (stat) (Right_DoubleQuote '"') ('\n') ('\n') ('See the man page and example file for more info.\n') ] ) (redir.Redir op:<Redir_GreatAnd '>&'> fd:16777215 arg_word:{(2)}) ] ) (command.ControlFlow token:<ControlFlow_Exit exit>) ] ) ) (command.ShFunction name: warn body: (command.BraceGroup children: [ (command.If arms: [ (if_arm cond: [ (command.Sentence child: (command.Pipeline children: [(C {(eval)} {(DQ ($ VSub_At '$@'))})] negated: T ) terminator: <Op_Semi ';'> ) ] action: [ (command.Simple words: [ {(echo)} { (DQ ('WARNING: command failed ') (word_part.EscapedLiteral token: <Lit_EscapedChar '\\"'> ) ($ VSub_At '$@') (word_part.EscapedLiteral token:<Lit_EscapedChar '\\"'>) ) } ] redirects: [(redir.Redir op:<Redir_GreatAnd '>&'> fd:16777215 arg_word:{(2)})] ) ] ) ] ) ] ) ) (command.ShFunction name: end body: (command.BraceGroup children: [ (command.Simple words: [{(echo)}] redirects: [(redir.Redir op:<Redir_Great '2>'> fd:2 arg_word:{(/dev/null)})] ) (command.Simple words: [{(echo)} {(DQ ('Ending tracing...'))}] redirects: [(redir.Redir op:<Redir_Great '2>'> fd:2 arg_word:{(/dev/null)})] ) (C {(cd)} {($ VSub_DollarName '$tracing')}) (C {(warn)} {(DQ ('echo 0 > events/kprobes/') ($ VSub_DollarName '$kname') (/enable))}) (command.If arms: [ (if_arm cond: [ (command.Sentence child: (command.DParen child: (arith_expr.VarRef token:<Lit_ArithVarLike opt_filter>) ) terminator: <Op_Semi ';'> ) ] action: [ (C {(warn)} {(DQ ('echo 0 > events/kprobes/') ($ VSub_DollarName '$kname') (/filter))} ) ] ) ] ) (C {(warn)} {(DQ ('echo -:') ($ VSub_DollarName '$kname') (' >> kprobe_events'))}) (command.AndOr ops: [Op_DAmp] children: [ (command.DParen child: (arith_expr.VarRef token:<Lit_ArithVarLike opt_stack>) ) (C {(warn)} {(DQ ('echo 0 > options/stacktrace'))}) ] ) (C {(warn)} {(DQ ('echo > trace'))}) (command.AndOr ops: [Op_DAmp] children: [ (command.DParen child: (arith_expr.VarRef token:<Lit_ArithVarLike wroteflock>) ) (C {(warn)} {(DQ ('rm ') ($ VSub_DollarName '$flock'))}) ] ) ] ) ) (command.ShFunction name: die body: (command.BraceGroup children: [ (command.Simple words: [{(echo)} {(DQ ($ VSub_At '$@'))}] redirects: [(redir.Redir op:<Redir_GreatAnd '>&'> fd:16777215 arg_word:{(2)})] ) (command.ControlFlow token:<ControlFlow_Exit exit> arg_word:{(1)}) ] ) ) (command.ShFunction name: edie body: (command.BraceGroup children: [ (command.Simple words: [{(echo)} {(DQ ($ VSub_At '$@'))}] redirects: [(redir.Redir op:<Redir_GreatAnd '>&'> fd:16777215 arg_word:{(2)})] ) (command.Simple words: [{(exec)}] redirects: [ (redir.Redir op:<Redir_Great '>'> fd:16777215 arg_word:{(/dev/null)}) (redir.Redir op:<Redir_GreatAnd '2>&'> fd:2 arg_word:{(1)}) ] ) (C {(end)}) (command.ControlFlow token:<ControlFlow_Exit exit> arg_word:{(1)}) ] ) ) (command.WhileUntil keyword: <KW_While while> cond: [ (C {(getopts)} {(Fd) (Lit_Other ':') (hHp) (Lit_Other ':') (L) (Lit_Other ':') (sv)} {(opt)}) ] body: (command.DoGroup children: [ (command.Case to_match: {($ VSub_DollarName '$opt')} arms: [ (case_arm pat_list: [{(F)}] action: [ (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:opt_force) op:Equal rhs:{(1)})] ) ] ) (case_arm pat_list: [{(d)}] action: [ (command.Sentence child: (command.ShAssignment pairs: [ (assign_pair lhs: (sh_lhs_expr.Name name:opt_duration) op: Equal rhs: {(1)} ) ] ) terminator: <Op_Semi ';'> ) (command.ShAssignment pairs: [ (assign_pair lhs: (sh_lhs_expr.Name name:duration) op: Equal rhs: {($ VSub_DollarName '$OPTARG')} ) ] ) ] ) (case_arm pat_list: [{(p)}] action: [ (command.Sentence child: (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:opt_pid) op:Equal rhs:{(1)})] ) terminator: <Op_Semi ';'> ) (command.ShAssignment pairs: [ (assign_pair lhs: (sh_lhs_expr.Name name:pid) op: Equal rhs: {($ VSub_DollarName '$OPTARG')} ) ] ) ] ) (case_arm pat_list: [{(L)}] action: [ (command.Sentence child: (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:opt_tid) op:Equal rhs:{(1)})] ) terminator: <Op_Semi ';'> ) (command.ShAssignment pairs: [ (assign_pair lhs: (sh_lhs_expr.Name name:tid) op: Equal rhs: {($ VSub_DollarName '$OPTARG')} ) ] ) ] ) (case_arm pat_list: [{(H)}] action: [ (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:opt_headers) op:Equal rhs:{(1)})] ) ] ) (case_arm pat_list: [{(s)}] action: [ (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:opt_stack) op:Equal rhs:{(1)})] ) ] ) (case_arm pat_list: [{(v)}] action: [ (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:opt_view) op:Equal rhs:{(1)})] ) ] ) (case_arm pat_list:[{(h)} {(Lit_QMark '?')}] action:[(C {(usage)})]) ] ) ] ) ) (C {(shift)} { (word_part.ArithSub anode: (arith_expr.Binary op_id: Arith_Minus left: (arith_expr.ArithWord w:{($ VSub_DollarName '$OPTIND')}) right: (arith_expr.ArithWord w:{(Lit_Digits 1)}) ) ) } ) (command.AndOr ops: [Op_DPipe] children: [(command.DParen child:(arith_expr.ArithWord w:{($ VSub_Pound '$#')})) (C {(usage)})] ) (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:kprobe) op:Equal rhs:{($ VSub_Number '$1')})] ) (C {(shift)}) (command.If arms: [ (if_arm cond: [ (command.Sentence child: (command.DParen child:(arith_expr.ArithWord w:{($ VSub_Pound '$#')})) terminator: <Op_Semi ';'> ) ] action: [ (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:opt_filter) op:Equal rhs:{(1)})] ) (command.ShAssignment pairs: [ (assign_pair lhs: (sh_lhs_expr.Name name:filter) op: Equal rhs: {($ VSub_Number '$1')} ) ] ) ] ) ] ) (command.AndOr ops: [Op_DAmp] children: [ (command.DParen child: (arith_expr.Binary op_id: Arith_Great left: (arith_expr.Binary op_id: Arith_Plus left: (arith_expr.Binary op_id: Arith_Plus left: (arith_expr.VarRef token:<Lit_ArithVarLike opt_pid>) right: (arith_expr.VarRef token:<Lit_ArithVarLike opt_filter>) ) right: (arith_expr.VarRef token:<Lit_ArithVarLike opt_tid>) ) right: (arith_expr.ArithWord w:{(Lit_Digits 1)}) ) ) (C {(die)} {(DQ ('ERROR: use at most one of -p, -L, or filter.'))}) ] ) (command.AndOr ops: [Op_DAmp] children: [ (command.DParen child: (arith_expr.Binary op_id: Arith_DAmp left: (arith_expr.VarRef token:<Lit_ArithVarLike opt_duration>) right: (arith_expr.VarRef token:<Lit_ArithVarLike opt_view>) ) ) (C {(die)} {(DQ ('ERROR: use either -d or -v.'))}) ] ) (command.If arms: [ (if_arm cond: [ (command.Sentence child: (command.DParen child:(arith_expr.VarRef token:<Lit_ArithVarLike opt_pid>)) terminator: <Op_Semi ';'> ) ] action: [ (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:opt_filter) op:Equal rhs:{(1)})] ) (command.ForEach iter_name: tid iter_words: [{(/proc/) ($ VSub_DollarName '$pid') (/task/) (Lit_Star '*')}] do_arg_iter: F body: (command.DoGroup children: [ (command.ShAssignment pairs: [ (assign_pair lhs: (sh_lhs_expr.Name name:filter) op: Equal rhs: { (DQ ($ VSub_DollarName '$filter') (' || common_pid == ') (braced_var_sub token: <VSub_Name tid> suffix_op: (suffix_op.Unary op_id: VOp1_DPound arg_word: {('*') (Lit_Slash /)} ) ) ) } ) ] ) ] ) ) (command.ShAssignment pairs: [ (assign_pair lhs: (sh_lhs_expr.Name name:filter) op: Equal rhs: { (braced_var_sub token: <VSub_Name filter> suffix_op: (suffix_op.Slice begin:(arith_expr.ArithWord w:{(Lit_Digits 3)})) ) } ) ] ) ] ) ] ) (command.If arms: [ (if_arm cond: [ (command.Sentence child: (command.DParen child:(arith_expr.VarRef token:<Lit_ArithVarLike opt_tid>)) terminator: <Op_Semi ';'> ) ] action: [ (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:opt_filter) op:Equal rhs:{(1)})] ) (command.ShAssignment pairs: [ (assign_pair lhs: (sh_lhs_expr.Name name:filter) op: Equal rhs: {(DQ ('common_pid == ') ($ VSub_DollarName '$tid'))} ) ] ) ] ) ] ) (command.If arms: [ (if_arm cond: [ (command.Sentence child: (command.DBracket expr: (bool_expr.LogicalAnd left: (bool_expr.Binary op_id: BoolBinary_GlobNEqual left: {(DQ ($ VSub_DollarName '$kprobe'))} right: {(p) (Lit_Other ':') (Lit_Other '*')} ) right: (bool_expr.Binary op_id: BoolBinary_GlobNEqual left: {(DQ ($ VSub_DollarName '$kprobe'))} right: {(r) (Lit_Other ':') (Lit_Other '*')} ) ) ) terminator: <Op_Semi ';'> ) ] action: [ (command.Simple words: [{(echo)} {(DQ ('ERROR: invalid kprobe definition (should start with p: or r:)'))}] redirects: [(redir.Redir op:<Redir_GreatAnd '>&'> fd:16777215 arg_word:{(2)})] ) (C {(usage)}) ] ) ] ) (command.ShAssignment pairs: [ (assign_pair lhs: (sh_lhs_expr.Name name:krest) op: Equal rhs: { (braced_var_sub token: <VSub_Name kprobe> suffix_op: (suffix_op.Unary op_id:VOp1_Pound arg_word:{('*:')}) ) } ) ] ) (command.ShAssignment pairs: [ (assign_pair lhs: (sh_lhs_expr.Name name:kname) op: Equal rhs: { (braced_var_sub token: <VSub_Name krest> suffix_op: (suffix_op.Unary op_id:VOp1_DPercent arg_word:{(' *')}) ) } ) ] ) (C {(KW_Set set)} {(--)} {($ VSub_DollarName '$krest')}) (command.If arms: [ (if_arm cond: [ (command.Sentence child: (command.DBracket expr: (bool_expr.LogicalOr left: (bool_expr.Binary op_id:BoolBinary_GlobDEqual left:{($ VSub_Number '$2')} right:{(DQ )}) right: (bool_expr.Binary op_id: BoolBinary_GlobDEqual left: {($ VSub_Number '$2')} right: {(Lit_Other '*') (Lit_Other '[') (BoolBinary_GlobEqual '=') (Lit_Other '%') (word_part.EscapedLiteral token: <Lit_EscapedChar '\\$'> ) (Lit_Other ']') (Lit_Other '*') } ) ) ) terminator: <Op_Semi ';'> ) ] action: [ (command.ShAssignment pairs: [ (assign_pair lhs: (sh_lhs_expr.Name name:ktype) op: Equal rhs: { (braced_var_sub token: <VSub_Name kprobe> suffix_op: (suffix_op.Unary op_id:VOp1_DPercent arg_word:{(':*')}) ) } ) ] ) (command.ShAssignment pairs: [ (assign_pair lhs: (sh_lhs_expr.Name name:kprobe) op: Equal rhs: { (DQ ($ VSub_DollarName '$ktype') (':') ($ VSub_DollarName '$kname') (' ') ($ VSub_DollarName '$krest') ) } ) ] ) ] ) ] ) (command.If arms: [ (if_arm cond: [ (command.Sentence child: (command.DParen child:(arith_expr.VarRef token:<Lit_ArithVarLike debug>)) terminator: <Op_Semi ';'> ) ] action: [ (C {(echo)} { (DQ ('kname: ') ($ VSub_DollarName '$kname') (', kprobe: ') ($ VSub_DollarName '$kprobe') ) } ) ] ) ] ) (command.AndOr ops: [Op_DPipe] children: [ (C {(cd)} {($ VSub_DollarName '$tracing')}) (C {(die)} { (DQ ('ERROR: accessing tracing. Root user? Kernel has FTRACE?\n') (' debugfs mounted? (mount -t debugfs debugfs /sys/kernel/debug)') ) } ) ] ) (C {(KW_Set set)} {(--)} {($ VSub_DollarName '$kprobe')}) (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:fname) op:Equal rhs:{($ VSub_Number '$2')})] ) (command.If arms: [ (if_arm cond: [ (command.AndOr ops: [Op_DAmp] children: [ (command.DParen child: (arith_expr.Unary op_id: Arith_Bang child: (arith_expr.VarRef token:<Lit_ArithVarLike opt_force>) ) ) (command.Pipeline children: [ (command.Simple words: [ {(grep)} {(-w)} {($ VSub_DollarName '$fname')} {(available_filter_functions)} ] redirects: [ (redir.Redir op: <Redir_Great '>'> fd: 16777215 arg_word: {(/dev/null)} ) (redir.Redir op: <Redir_GreatAnd '2>&'> fd: 2 arg_word: {(1)} ) ] ) ] negated: T ) ] ) ] action: [ (command.Simple words: [ {(echo)} { (DQ ('ERROR: func ') ($ VSub_DollarName '$fname') (' not in ') ($ VSub_DollarName '$PWD') (/available_filter_functions.) ) } ] redirects: [(redir.Redir op:<Redir_GreatAnd '>&'> fd:16777215 arg_word:{(2)})] ) (command.Simple words: [{(printf)} {(DQ ("Either it doesn't exist, or, it might be unsafe to kprobe. "))}] redirects: [(redir.Redir op:<Redir_GreatAnd '>&'> fd:16777215 arg_word:{(2)})] ) (command.Simple words: [{(echo)} {(DQ ('Exiting. Use -F to override.'))}] redirects: [(redir.Redir op:<Redir_GreatAnd '>&'> fd:16777215 arg_word:{(2)})] ) (command.ControlFlow token:<ControlFlow_Exit exit> arg_word:{(1)}) ] ) ] ) (command.If arms: [ (if_arm cond: [ (command.Sentence child: (command.DParen child: (arith_expr.Unary op_id: Arith_Bang child: (arith_expr.VarRef token:<Lit_ArithVarLike opt_view>) ) ) terminator: <Op_Semi ';'> ) ] action: [ (command.If arms: [ (if_arm cond: [ (command.Sentence child: (command.DParen child: (arith_expr.VarRef token:<Lit_ArithVarLike opt_duration>) ) terminator: <Op_Semi ';'> ) ] action: [ (C {(echo)} { (DQ ('Tracing kprobe ') ($ VSub_DollarName '$kname') (' for ') ($ VSub_DollarName '$duration') (' seconds (buffered)...') ) } ) ] ) ] else_action: [ (C {(echo)} {(DQ ('Tracing kprobe ') ($ VSub_DollarName '$kname') ('. Ctrl-C to end.'))}) ] ) ] ) ] ) (command.AndOr ops: [Op_DAmp] children: [ (command.DBracket expr: (bool_expr.Unary op_id:BoolUnary_e child:{($ VSub_DollarName '$flock')}) ) (C {(die)} { (DQ ('ERROR: ftrace may be in use by PID ') (command_sub left_token: <Left_DollarParen '$('> command_list: (command.CommandList children: [(C {(cat)} {($ VSub_DollarName '$flock')})] ) ) (' ') ($ VSub_DollarName '$flock') ) } ) ] ) (command.AndOr ops: [Op_DPipe] children: [ (command.Simple words: [{(echo)} {($ VSub_Dollar '$$')}] redirects: [ (redir.Redir op: <Redir_Great '>'> fd: 16777215 arg_word: {($ VSub_DollarName '$flock')} ) ] ) (C {(die)} {(DQ ('ERROR: unable to write ') ($ VSub_DollarName '$flock') (.))}) ] ) (command.ShAssignment pairs: [(assign_pair lhs:(sh_lhs_expr.Name name:wroteflock) op:Equal rhs:{(1)})] ) (command.Simple words: [{(echo)} {(nop)}] redirects: [(redir.Redir op:<Redir_Great '>'> fd:16777215 arg_word:{(current_tracer)})] ) (command.If arms: [ (if_arm cond: [ (command.Sentence child: (command.Pipeline children: [ (command.Simple words: [{(echo)} {(DQ ($ VSub_DollarName '$kprobe'))}] redirects: [ (redir.Redir op: <Redir_DGreat '>>'> fd: 16777215 arg_word: {(kprobe_events)} ) ] ) ] negated: T ) terminator: <Op_Semi ';'> ) ] action: [ (command.Simple words: [ {(echo)} { (DQ ('ERROR: adding kprobe ') (word_part.EscapedLiteral token:<Lit_EscapedChar '\\"'>) ($ VSub_DollarName '$kprobe') (word_part.EscapedLiteral token:<Lit_EscapedChar '\\"'>) (.) ) } ] redirects: [(redir.Redir op:<Redir_GreatAnd '>&'> fd:16777215 arg_word:{(2)})] ) (command.If arms: [ (if_arm cond: [ (command.Sentence child: (command.DParen child:(arith_expr.VarRef token:<Lit_ArithVarLike dmesg>)) terminator: <Op_Semi ';'> ) ] action: [ (command.Simple words: [ {(echo)} { (DQ ('Last ') ($ VSub_DollarName '$dmesg') (' dmesg entries (might contain reason):') ) } ] redirects: [(redir.Redir op:<Redir_GreatAnd '>&'> fd:16777215 arg_word:{(2)})] ) (command.Pipeline children: [ (C {(dmesg)}) (C {(tail)} {(-) ($ VSub_DollarName '$dmesg')}) (C {(sed)} {(SQ <'s/^/ /'>)}) ] negated: F ) ] ) ] ) (C {(edie)} {(DQ (Exiting.))}) ] ) ] ) (command.If arms: [ (if_arm cond: [ (command.Sentence child: (command.DParen child:(arith_expr.VarRef token:<Lit_ArithVarLike opt_view>)) terminator: <Op_Semi ';'> ) ] action: [(C {(cat)} {(events/kprobes/) ($ VSub_DollarName '$kname') (/format)}) (C {(edie)} {(DQ )})] ) ] ) (command.If arms: [ (if_arm cond: [ (command.Sentence child: (command.DParen child:(arith_expr.VarRef token:<Lit_ArithVarLike opt_filter>)) terminator: <Op_Semi ';'> ) ] action: [ (command.If arms: [ (if_arm cond: [ (command.Sentence child: (command.Pipeline children: [ (command.Simple words: [{(echo)} {(DQ ($ VSub_DollarName '$filter'))}] redirects: [ (redir.Redir op: <Redir_Great '>'> fd: 16777215 arg_word: {(events/kprobes/) ($ VSub_DollarName '$kname') (/filter)} ) ] ) ] negated: T ) terminator: <Op_Semi ';'> ) ] action: [(C {(edie)} {(DQ ('ERROR: setting filter or -p. Exiting.'))})] ) ] ) ] ) ] ) (command.If arms: [ (if_arm cond: [ (command.Sentence child: (command.DParen child:(arith_expr.VarRef token:<Lit_ArithVarLike opt_stack>)) terminator: <Op_Semi ';'> ) ] action: [ (command.If arms: [ (if_arm cond: [ (command.Sentence child: (command.Pipeline children: [ (command.Simple words: [{(echo)} {(1)}] redirects: [ (redir.Redir op: <Redir_Great '>'> fd: 16777215 arg_word: {(options/stacktrace)} ) ] ) ] negated: T ) terminator: <Op_Semi ';'> ) ] action: [(C {(edie)} {(DQ ('ERROR: enabling stack traces (-s). Exiting'))})] ) ] ) ] ) ] ) (command.If arms: [ (if_arm cond: [ (command.Sentence child: (command.Pipeline children: [ (command.Simple words: [{(echo)} {(1)}] redirects: [ (redir.Redir op: <Redir_Great '>'> fd: 16777215 arg_word: {(events/kprobes/) ($ VSub_DollarName '$kname') (/enable)} ) ] ) ] negated: T ) terminator: <Op_Semi ';'> ) ] action: [ (C {(edie)} {(DQ ('ERROR: enabling kprobe ') ($ VSub_DollarName '$kname') ('. Exiting.'))}) ] ) ] ) (C {(warn)} {(DQ ('echo > trace'))}) (command.If arms: [ (if_arm cond: [ (command.Sentence child: (command.DParen child:(arith_expr.VarRef token:<Lit_ArithVarLike opt_duration>)) terminator: <Op_Semi ';'> ) ] action: [ (C {(sleep)} {($ VSub_DollarName '$duration')}) (command.If arms: [ (if_arm cond: [ (command.Sentence child: (command.DParen child: (arith_expr.VarRef token:<Lit_ArithVarLike opt_headers>) ) terminator: <Op_Semi ';'> ) ] action: [(C {(cat)} {(trace)})] ) ] else_action: [(C {(grep)} {(-v)} {(SQ <'^#'>)} {(trace)})] ) ] ) ] else_action: [ (command.AndOr ops: [Op_DAmp] children: [ (command.DParen child:(arith_expr.VarRef token:<Lit_ArithVarLike opt_headers>)) (C {(cat)} {(trace)}) ] ) (C {(cat)} {(trace_pipe)}) ] ) (C {(end)}) ] )