Using the code provided in the photos attached, write the indicated code in signal.hxx (seen as the TODO portions) as seen in photos 2, 3, 4 so that it functions with the code in photo 1. Photos 5 and onward are provided files as-is files and should be compatible with the signal.hxx

Code is written in C++

lection Find Packages Window include catonis include void 10. store signo, nemory_order_release): 21 signalhandler flags synchronous Default 24 for auto cucin.get char traits charioteoftel: Cecin.get()) if (id INVALID_SIGNAL) - - cout a signo1 cc id, load memory order acourel id.store INVALID_SIGNAL, memory_order_releasel coutstatic_casteunsignedetele : coute "\: MacBook Pro Bifndef COMP3400_2020_A3_signalha define COMP3400_2020_AB_signahak B include signals ude est except include et traits le cinitializer List namespace comp.3400_202 203 1 1 TODO Define class li here 21 TODO: Define sitanter error inte der er mere 31 Define signal handler geret and sel andere here B : Define signal_andler_default and signal_ ter_default here class l_handler_ee 100010.4.0 oer MacBook Pro Selection Find Packages 3) class signal_handler_op private TODO: Define op here. Pablic: TODO: Define traditional_op_type here. 11 TODO: Define si action type here. 02 46 45 private: TODO: Declare ERROR here. Definition is in pri s l .com 11 TODO: Declare IGNORE here. Definition is in provinsial.com // TODO: Declare DEFAULT here. Definition is provi sional. ) op_type type union traditionaloptypes_handler sigaction_op_type sa sigaction public TODO: Define all constructors and functions intim e signal handler op() signal handler signalhandler og cost shel: signal handler op sperater na handler op cost sho: signal_handler_apisignalhandler_default_t const Signal_handler_eple operator handler default Cat ) signal_handler_ signalhandler_ignoret const signal_handler_06 operater f ra handler_agnere con signal handler opsional handler error cont; MacBook Pro Selection Find Packa h e ment Programming C.. signa andler op operator tagna andler_error_t consta Signalhandler_epitraditional_op_type conste opls signal_handler_ople operator tradition Lop_type const opla Signalhandler opsiocong type const op signalhandler_ople operator (sigaction_ep_type const opla operator bool() const bool is error() consti bool is default() consti bool ishorel) const 31 bool is traditional() consti bool isigactie) consti traditional sigation opt type traditional ) con i onction ) consts bool operator signal handler op conta consta bool operater in signalhandler o conta consta Il nespace C 0 _2020 #include "provided-signal.hr MacBook Pro BABA 1 Bifndef COMP3400_2020W_A03_provided_signal_hxx. #define COMP3400_2020W_A03_provided_signal_hxx_ 6 7 8 9 #include #include #include ace comp3400_2026w::a3 { 16 17 /1 1 1/ The macros below used to detect an operating system varies by compiler 1911 and operating system. A site that lists these macro names by os 2011 is here: 21 22 / https://sourceforge.net/p/predef/wiki/Operating Systems/ 25 26 27 28 29 /1 // POSIX systems define struct sigaction's sa_flags member to be an "int". !! One might want to write code to determine the type of a struct member. // This can be easily done in C++11. See the detail namespace below. // 31 namespace detail { 34 35 1 Since sigaction is also the name of a function, referring to sigaction l can refer to struct sioaction or the function. To avoid a broblema MacBook Pro WANI w Selection Find Packages Window Help provided-signal.hxx-/Documents/Advanced Programming C++ provided-signal.hxx Sonali 31 namespace detail { 34 Since sigaction is the name of a function, referring to sigaction 35 // can refer to struct sigaction or the function. To avoid a problem, a 36 // type alias, struct sigaction_type, is defined and set to the struct 37 // sigaction type --not the sigaction function type. 31 39 using struct_sigaction_type = struct sigaction; 42 7 on idiom in C++ is to use a function template prototype in 43 // conjunction with code that ONLY looks at the return type of a function to 44 // figure out things about the type(s) passed in to that function's 45 // arguments. Such expressions must be only used within decltype 46 // for noexcept() clauses). 47 / 4811 NOTE: This function will NEVER be defined: only its prototype exists. 50 // The get_member_type() prototype only accepts a pointer to a member. If 511/ called with a pointer to a member, per language rules with function S2 // template argument type deduction, type deduction occurs. This causes 531/ T to be the struct/union/class type of the pointer passed in, and, 54// N to be the type of the member. 55 // 56 11 NOTE: Clearly this all happens at compile-time. 5711 58 template 59 H get member type(M T::.); 6211 Define a type alias, sigaction flags_type, to be the type of the 63 11struct sigaction's saflags member. Two things are important here: 64 | The "&" is needed some one needs a pointer to the member, and MacBook Pro View Selection Find Packages Window Help provided-signal.hxx--/Documents/Advanced Programming C++ provided-signal.hxx a3.co signal.ro // Define a type autosigaction Flags_type, to be the type of the 621/ struct sigactie flags member. Two things are important ner 64 // The '&' is neede e one needs a pointer to the member, and, 65 // the entire function "call" is wrapped in decltype which ONLY 66 // determines the resulting type of the expression: no code is ever called 68 // The result is sigaction_flags_type has the type of the sa_flags member. sing sigaction_flags_type = pe(detail::get_member_type(detail::struct_sigaction type 74 ) // namespace detail 76 77 78 enum class signal_handler_flags : typename detail isigaction_flags_type ( interruptable = SA_NODEFER, auto_restart_system_calls = SA_RESTART, revert_to_default = #if defined(_gnu_linux_) || defined(_linux_) 81 82 1/ For some unknown reason, SA RESETHAND in Linux is set to a value // larger than the maximus allowed by int, i.e., the value is likely // intended to be negative being improperly set with a positive value greater than /stdrinumeric limits intimax(). A static cast is used here to force successful compilation (and non-portable integer wrapping). NOTE: Since this is from the operating system it is "de facto correct even though it violates the standard, thus, we force the value to be set. 92 static_caststypename detailussigaction_flags_type(SA_RESETHAND), MacBook Pro DOVIL igrale provided signal Box static caststypename detail: :sigaction_flags_type>(SA_RESETHAND), delse 11 Otherwise, just the correct POSIX value... SA RESETHAND, tendif // Sifdef synchronous defaultauto_restart system calls, asynchronous_default - Interruptableauto_restart_system_calls 102 }; T 187 10 10 110 a ndler_op install signal_handler Signal_id consta id, ional handler op const& op signal handler default, Signal_handler_flags const& flagssignal_handler_flags :: synchronous_default ): 1 11 The following inline functions allow one to pass a signat handler 1 using a function pointer (sional-style or sigaction-style instead 116 inline signal_handler_op install signal_handler signal_id const& id, signal_handler_op11 traditional_op_type consta op. 11 Sional_handler_flags const& flagssignal_handler_flags11 synchronous default 12 return install signal_handlertid, signal_handler_op(op), flags) 125 126 127 intine signal_handler_op install signal_handler signal_id consta id, Signal_handler_opiisigaction_op_type const& op. MacBook Pro Selection Find Packages Window Help provided signal Documents Advanced Programming Co provided-signal.hr 110 inline signal_handler_op install signal_handler Signal_id consta id, Signal_handler_opis traditional_op_type consta op, Sional_handler_flags flagssignal_handler_flags.: synchronous default return install sional handler ad, signalhandler_op(op), Flags) 125 126 127 inline signal_handler_op install signalhandler signal_id consta id, signal_handler_op:: sigaction_op_type consta op. nal_handler_flags const& flags signal_handler_flagsis synchronous_defa return install signalhandler id, signal_handler_oplop), Flags 137 138 39 // The following convenience inline functions allow one pass a list (s.e., a 11 stdrinitializer_list signal_id) of signal numbers to install a specific 1/ handler. 161 142 inline stdrivector signal_handler_op install signal_handler stdii initializer_list signalido consta ids, signal_handler_op conste op signal_handler_default, Sional_handler_flags conste Flagssignalandler_flags11 synchronous_default stdii vector signal_handler_oppretval(); for (autob id ids) retval.push_back install signal_handler( id, op, flags)): return retrats MacBook Pro GAR File Edit View Selection Find Packages Window Help provided-signalho /Documents/Advanced Programming C++ provided signalhas Project d Programming C 141 inline std::ver n al_handler_op install signal_handler std::initializer_ st signal_1d consta ids, signal_handler_op constop signal_handler_default, Sional handler_flags const& flags signal_handler_flags! 1 synchronous_default de- al ha alho std::vector signal_handler_ope retval(); for (autos id : ids) retval.push_back install signal_handler( id, op, flags)); return retval: 153 155 inline std::vector signal handler op install signal handler std::initializer listesignal_id consta ids, signal handler op::traditional op type consta op. signal_handler flags consta flags signal handler flagst i synchronous_default 158 160 std::vector signal_handler_opretval(); for (autos id ids) retval.push_back install signal_handtertad, signal_handler_oplop), flags) return retvat: 169 se inline stor vector signal handler og install signal_handler std::initializer listesignal_id consta ids, signal_handler op!usigaction_op_type consta op. signal_handler flags conste flags signal_handler_flags::synchronous default 173 std: vector signal_handler_opretval(); OROW MacBook Pro 123ABOGB provided-signal.hxx - -/Documents/Advanced Programming C++ signal.hxx provided-signal.hxx std::vector retval{}; 174 for (auto& id : id 175 retval.push_back 176 install_signal_handler(id, signal_handler_op{op), flags) 177 ); 178 return retval; 179 } 18e 183 boot block_signals(std::initializer_list const& ids); 181 bool unblock_signals(std::initializer_list signal_id> const& id); 185 186 // 187 188 template 189 auto block_signals(Container const& c) -> 190 std::enable_if 191 std::is_same_v 192 std:: remove_cv_ta 193 std:: remove_reference tatypename Container::value type> 194 195 Signal_id 196 197 bool GE 199 sigset_t mask; 201 sigemptyset (mask); for (auto consta id : c) sigaddset (mask, id); 204 return sigprocmask(SIG_SETMASK, mask, NULL) - -1; MacBook Pro File Edit View Selection Find Packages Window Help D provided-signal.hxx--/Documents/Advanced Programming provided-signal.hocx Project signal ogramming C++ 209 template 210 auto unblock_signals(Container const& c) -> 211 std::enable_ita std::is_same_v 213 std:: remove_cv_tz std: remove_reference ttypename Container::value lloworld.com rovided-signal.com vided-signals signal 212 signal_id bool 219 220 1221 222 223 sigset_t mask; sigemptyset (Emask); for (auto const& id : c) sigaddset (mask, id); return sigprocrask(SIG_UNBLOCK, Smask, NULL) I= -1; 225 230. inline bool block_signal(signal_id const& id) 231 { 232 return block_signals({id}); 233 235 inline bool unblock_signal(signalid const& id) return unblock_signals({id}); 239 MacBook Pro std::renove_reference_tstypename Container::value_type signal_id bool sigset_t mask; sigemptyset (mask); 223 for (auto consta id : c) Sigaddset (mask, id); 25 return sigprocmask(SIG_UNBLOCK, Smask, NULL) != -1; 226 ) 230 231 232 inline boot block_signal(signal_id consta id) { return block_signals({id}); 235 inline bool unblock_signal(signalid consta id) return unblock_signals((id)); 237 238 241 242 >1 namespace comp3400_2020w11003 2 Bendif // Binder COMP 3400 2020W_A3 provided_signal MacBook Pro e TW ER Selection Find Packages Window Help provided-signal.cxx--Documents/Advanced Programming C++ provided the 1 include Sinclude "signal.hxx" namespace comp3400_2020 signal_handler_op::traditional_op_type const signal_handler_op::ERROR = SIG_ERR; signal_handler_op::traditional_op_type const signal_handler_op::IGNORE - SIG_IGN; sional handler op::traditional op type const signal handler op::DEFAULT = SIG DFL: 10 signal_handler_op install signal_handler sional id consta id, handler op consta op. dler_flags consta flags I struct sigaction act: sigenptyset (act.sa_mask): Set the required flags... act.sa_flags = static_cast std::underlying_type_t signal_handler_flags>(flags) // Set the appropriate handler function.. if (op.is traditional) act.sa handler op.traditional_op(); else act.sa_sigaction = op.sigaction op(); act.sa flags SA SIGINFO: struct sigaction old act: memset(old act, O, sizeoftold act); MacBook Pro ) NS 9 0 View Selection Find Packages Window Help provided-signal.cxx--/Documents/Advanced Programming C++ signal provided-signalux 23.co act.sa_flags [= SA_SIGINFO; C++ struct sigaction o memset(cold_act, e, f (old_act)); 37 38 if (sigaction(id, act, bold_act) w -1) return (signal_handler_error }; else if ((old act.sa flags & SA_SIGINFO) BE SA SIGINFO) return ( old_act.sa_sigaction }; { old_act.sa_handler ); 44bool block_signals(std::initializer_list const& ids) 56 sigset_t mask; sigemptyset (mask); for (auto consta id : ids) sigaddset (mask, id); return sigprocmask(SIG_UNBLOCK, Emask, NULL) != -1; 59 62 // namespace comp3400_2020W:: 203 CK11 MacBook Pro lection Find Packages Window include catonis include void 10. store signo, nemory_order_release): 21 signalhandler flags synchronous Default 24 for auto cucin.get char traits charioteoftel: Cecin.get()) if (id INVALID_SIGNAL) - - cout a signo1 cc id, load memory order acourel id.store INVALID_SIGNAL, memory_order_releasel coutstatic_casteunsignedetele : coute "\: MacBook Pro Bifndef COMP3400_2020_A3_signalha define COMP3400_2020_AB_signahak B include signals ude est except include et traits le cinitializer List namespace comp.3400_202 203 1 1 TODO Define class li here 21 TODO: Define sitanter error inte der er mere 31 Define signal handler geret and sel andere here B : Define signal_andler_default and signal_ ter_default here class l_handler_ee 100010.4.0 oer MacBook Pro Selection Find Packages 3) class signal_handler_op private TODO: Define op here. Pablic: TODO: Define traditional_op_type here. 11 TODO: Define si action type here. 02 46 45 private: TODO: Declare ERROR here. Definition is in pri s l .com 11 TODO: Declare IGNORE here. Definition is in provinsial.com // TODO: Declare DEFAULT here. Definition is provi sional. ) op_type type union traditionaloptypes_handler sigaction_op_type sa sigaction public TODO: Define all constructors and functions intim e signal handler op() signal handler signalhandler og cost shel: signal handler op sperater na handler op cost sho: signal_handler_apisignalhandler_default_t const Signal_handler_eple operator handler default Cat ) signal_handler_ signalhandler_ignoret const signal_handler_06 operater f ra handler_agnere con signal handler opsional handler error cont; MacBook Pro Selection Find Packa h e ment Programming C.. signa andler op operator tagna andler_error_t consta Signalhandler_epitraditional_op_type conste opls signal_handler_ople operator tradition Lop_type const opla Signalhandler opsiocong type const op signalhandler_ople operator (sigaction_ep_type const opla operator bool() const bool is error() consti bool is default() consti bool ishorel) const 31 bool is traditional() consti bool isigactie) consti traditional sigation opt type traditional ) con i onction ) consts bool operator signal handler op conta consta bool operater in signalhandler o conta consta Il nespace C 0 _2020 #include "provided-signal.hr MacBook Pro BABA 1 Bifndef COMP3400_2020W_A03_provided_signal_hxx. #define COMP3400_2020W_A03_provided_signal_hxx_ 6 7 8 9 #include #include #include ace comp3400_2026w::a3 { 16 17 /1 1 1/ The macros below used to detect an operating system varies by compiler 1911 and operating system. A site that lists these macro names by os 2011 is here: 21 22 / https://sourceforge.net/p/predef/wiki/Operating Systems/ 25 26 27 28 29 /1 // POSIX systems define struct sigaction's sa_flags member to be an "int". !! One might want to write code to determine the type of a struct member. // This can be easily done in C++11. See the detail namespace below. // 31 namespace detail { 34 35 1 Since sigaction is also the name of a function, referring to sigaction l can refer to struct sioaction or the function. To avoid a broblema MacBook Pro WANI w Selection Find Packages Window Help provided-signal.hxx-/Documents/Advanced Programming C++ provided-signal.hxx Sonali 31 namespace detail { 34 Since sigaction is the name of a function, referring to sigaction 35 // can refer to struct sigaction or the function. To avoid a problem, a 36 // type alias, struct sigaction_type, is defined and set to the struct 37 // sigaction type --not the sigaction function type. 31 39 using struct_sigaction_type = struct sigaction; 42 7 on idiom in C++ is to use a function template prototype in 43 // conjunction with code that ONLY looks at the return type of a function to 44 // figure out things about the type(s) passed in to that function's 45 // arguments. Such expressions must be only used within decltype 46 // for noexcept() clauses). 47 / 4811 NOTE: This function will NEVER be defined: only its prototype exists. 50 // The get_member_type() prototype only accepts a pointer to a member. If 511/ called with a pointer to a member, per language rules with function S2 // template argument type deduction, type deduction occurs. This causes 531/ T to be the struct/union/class type of the pointer passed in, and, 54// N to be the type of the member. 55 // 56 11 NOTE: Clearly this all happens at compile-time. 5711 58 template 59 H get member type(M T::.); 6211 Define a type alias, sigaction flags_type, to be the type of the 63 11struct sigaction's saflags member. Two things are important here: 64 | The "&" is needed some one needs a pointer to the member, and MacBook Pro View Selection Find Packages Window Help provided-signal.hxx--/Documents/Advanced Programming C++ provided-signal.hxx a3.co signal.ro // Define a type autosigaction Flags_type, to be the type of the 621/ struct sigactie flags member. Two things are important ner 64 // The '&' is neede e one needs a pointer to the member, and, 65 // the entire function "call" is wrapped in decltype which ONLY 66 // determines the resulting type of the expression: no code is ever called 68 // The result is sigaction_flags_type has the type of the sa_flags member. sing sigaction_flags_type = pe(detail::get_member_type(detail::struct_sigaction type 74 ) // namespace detail 76 77 78 enum class signal_handler_flags : typename detail isigaction_flags_type ( interruptable = SA_NODEFER, auto_restart_system_calls = SA_RESTART, revert_to_default = #if defined(_gnu_linux_) || defined(_linux_) 81 82 1/ For some unknown reason, SA RESETHAND in Linux is set to a value // larger than the maximus allowed by int, i.e., the value is likely // intended to be negative being improperly set with a positive value greater than /stdrinumeric limits intimax(). A static cast is used here to force successful compilation (and non-portable integer wrapping). NOTE: Since this is from the operating system it is "de facto correct even though it violates the standard, thus, we force the value to be set. 92 static_caststypename detailussigaction_flags_type(SA_RESETHAND), MacBook Pro DOVIL igrale provided signal Box static caststypename detail: :sigaction_flags_type>(SA_RESETHAND), delse 11 Otherwise, just the correct POSIX value... SA RESETHAND, tendif // Sifdef synchronous defaultauto_restart system calls, asynchronous_default - Interruptableauto_restart_system_calls 102 }; T 187 10 10 110 a ndler_op install signal_handler Signal_id consta id, ional handler op const& op signal handler default, Signal_handler_flags const& flagssignal_handler_flags :: synchronous_default ): 1 11 The following inline functions allow one to pass a signat handler 1 using a function pointer (sional-style or sigaction-style instead 116 inline signal_handler_op install signal_handler signal_id const& id, signal_handler_op11 traditional_op_type consta op. 11 Sional_handler_flags const& flagssignal_handler_flags11 synchronous default 12 return install signal_handlertid, signal_handler_op(op), flags) 125 126 127 intine signal_handler_op install signal_handler signal_id consta id, Signal_handler_opiisigaction_op_type const& op. MacBook Pro Selection Find Packages Window Help provided signal Documents Advanced Programming Co provided-signal.hr 110 inline signal_handler_op install signal_handler Signal_id consta id, Signal_handler_opis traditional_op_type consta op, Sional_handler_flags flagssignal_handler_flags.: synchronous default return install sional handler ad, signalhandler_op(op), Flags) 125 126 127 inline signal_handler_op install signalhandler signal_id consta id, signal_handler_op:: sigaction_op_type consta op. nal_handler_flags const& flags signal_handler_flagsis synchronous_defa return install signalhandler id, signal_handler_oplop), Flags 137 138 39 // The following convenience inline functions allow one pass a list (s.e., a 11 stdrinitializer_list signal_id) of signal numbers to install a specific 1/ handler. 161 142 inline stdrivector signal_handler_op install signal_handler stdii initializer_list signalido consta ids, signal_handler_op conste op signal_handler_default, Sional_handler_flags conste Flagssignalandler_flags11 synchronous_default stdii vector signal_handler_oppretval(); for (autob id ids) retval.push_back install signal_handler( id, op, flags)): return retrats MacBook Pro GAR File Edit View Selection Find Packages Window Help provided-signalho /Documents/Advanced Programming C++ provided signalhas Project d Programming C 141 inline std::ver n al_handler_op install signal_handler std::initializer_ st signal_1d consta ids, signal_handler_op constop signal_handler_default, Sional handler_flags const& flags signal_handler_flags! 1 synchronous_default de- al ha alho std::vector signal_handler_ope retval(); for (autos id : ids) retval.push_back install signal_handler( id, op, flags)); return retval: 153 155 inline std::vector signal handler op install signal handler std::initializer listesignal_id consta ids, signal handler op::traditional op type consta op. signal_handler flags consta flags signal handler flagst i synchronous_default 158 160 std::vector signal_handler_opretval(); for (autos id ids) retval.push_back install signal_handtertad, signal_handler_oplop), flags) return retvat: 169 se inline stor vector signal handler og install signal_handler std::initializer listesignal_id consta ids, signal_handler op!usigaction_op_type consta op. signal_handler flags conste flags signal_handler_flags::synchronous default 173 std: vector signal_handler_opretval(); OROW MacBook Pro 123ABOGB provided-signal.hxx - -/Documents/Advanced Programming C++ signal.hxx provided-signal.hxx std::vector retval{}; 174 for (auto& id : id 175 retval.push_back 176 install_signal_handler(id, signal_handler_op{op), flags) 177 ); 178 return retval; 179 } 18e 183 boot block_signals(std::initializer_list const& ids); 181 bool unblock_signals(std::initializer_list signal_id> const& id); 185 186 // 187 188 template 189 auto block_signals(Container const& c) -> 190 std::enable_if 191 std::is_same_v 192 std:: remove_cv_ta 193 std:: remove_reference tatypename Container::value type> 194 195 Signal_id 196 197 bool GE 199 sigset_t mask; 201 sigemptyset (mask); for (auto consta id : c) sigaddset (mask, id); 204 return sigprocmask(SIG_SETMASK, mask, NULL) - -1; MacBook Pro File Edit View Selection Find Packages Window Help D provided-signal.hxx--/Documents/Advanced Programming provided-signal.hocx Project signal ogramming C++ 209 template 210 auto unblock_signals(Container const& c) -> 211 std::enable_ita std::is_same_v 213 std:: remove_cv_tz std: remove_reference ttypename Container::value lloworld.com rovided-signal.com vided-signals signal 212 signal_id bool 219 220 1221 222 223 sigset_t mask; sigemptyset (Emask); for (auto const& id : c) sigaddset (mask, id); return sigprocrask(SIG_UNBLOCK, Smask, NULL) I= -1; 225 230. inline bool block_signal(signal_id const& id) 231 { 232 return block_signals({id}); 233 235 inline bool unblock_signal(signalid const& id) return unblock_signals({id}); 239 MacBook Pro std::renove_reference_tstypename Container::value_type signal_id bool sigset_t mask; sigemptyset (mask); 223 for (auto consta id : c) Sigaddset (mask, id); 25 return sigprocmask(SIG_UNBLOCK, Smask, NULL) != -1; 226 ) 230 231 232 inline boot block_signal(signal_id consta id) { return block_signals({id}); 235 inline bool unblock_signal(signalid consta id) return unblock_signals((id)); 237 238 241 242 >1 namespace comp3400_2020w11003 2 Bendif // Binder COMP 3400 2020W_A3 provided_signal MacBook Pro e TW ER Selection Find Packages Window Help provided-signal.cxx--Documents/Advanced Programming C++ provided the 1 include Sinclude "signal.hxx" namespace comp3400_2020 signal_handler_op::traditional_op_type const signal_handler_op::ERROR = SIG_ERR; signal_handler_op::traditional_op_type const signal_handler_op::IGNORE - SIG_IGN; sional handler op::traditional op type const signal handler op::DEFAULT = SIG DFL: 10 signal_handler_op install signal_handler sional id consta id, handler op consta op. dler_flags consta flags I struct sigaction act: sigenptyset (act.sa_mask): Set the required flags... act.sa_flags = static_cast std::underlying_type_t signal_handler_flags>(flags) // Set the appropriate handler function.. if (op.is traditional) act.sa handler op.traditional_op(); else act.sa_sigaction = op.sigaction op(); act.sa flags SA SIGINFO: struct sigaction old act: memset(old act, O, sizeoftold act); MacBook Pro ) NS 9 0 View Selection Find Packages Window Help provided-signal.cxx--/Documents/Advanced Programming C++ signal provided-signalux 23.co act.sa_flags [= SA_SIGINFO; C++ struct sigaction o memset(cold_act, e, f (old_act)); 37 38 if (sigaction(id, act, bold_act) w -1) return (signal_handler_error }; else if ((old act.sa flags & SA_SIGINFO) BE SA SIGINFO) return ( old_act.sa_sigaction }; { old_act.sa_handler ); 44bool block_signals(std::initializer_list const& ids) 56 sigset_t mask; sigemptyset (mask); for (auto consta id : ids) sigaddset (mask, id); return sigprocmask(SIG_UNBLOCK, Emask, NULL) != -1; 59 62 // namespace comp3400_2020W:: 203 CK11 MacBook Pro