std::signal

`<csignal>`
`/-/* signal(int sig, /-/* handler);`	(1)
`extern "C" using /-/ = void(int);`	(2)	( *)

sig , handler. , , .

, , std::signal(sig, SIG_DFL) . , , , .

std::signal(sig, SIG_IGN). std::signal(sig, SIG_DFL).

(: POSIX sigaction , )

sig

, . , :

SIGABRTSIGFPESIGILLSIGINTSIGSEGVSIGTERM

() []

handler

. :

SIG_DFL. .
SIG_IGN. .
. :

`extern "C" void fun(int sig);`

`void fun(int sig);`

( C++17)

SIG_ERR ( )

, , .

std::abort std::raise ( ), ,

,

std::abort
std::_Exit
std::quick_exit
std::signal, ( , ).

, std::atomic ( C++11)volatile std::sig_atomic_t.

( C++17)

f <atomic> <stdatomic.h> ( C++23), :

f std::atomic_is_lock_free,
f - is_lock_free (, std::atomic::is_lock_free()),
f - std::atomic_flag,
f , , f cv std::atomic_flag*,
f -, obj, obj.is_lock_free() true,
f -, arg, f, std::atomic_is_lock_free(arg) true.

, - :

(, , ):

std::signal, ( , ).
- std::numeric_limits
std::_Exit
std::abort
std::quick_exit
- std::initializer_list std::begin std::end std::initializer_list
std::forward, std::move, std::move_if_noexcept
<type_traits>
std::memcpy std::memmove

dynamic_cast
throw
try, try-
, ( ODR)
- ,

( C++17)

, SIGFPE, SIGILL, SIGSEGV , , .

std::abort std::raise ( ), , std::raise.

,

volatile std::sig_atomic_t

( C++11)

, , volatile std::sig_atomic_t std::atomic, .

( C++14)

signal() .

std::raise (), std::raise , std::raise. .

volatile std::sig_atomic_t , , . , , , A B, B A, volatile std::sig_atomic_t , A B.

( C++14)

POSIX , signal , , .

, , , C C++. C++ .	( C++17)
.	( C++17)

#include <csignal>
#include <iostream>

namespace
{
  volatile std::sig_atomic_t gSignalStatus;
}

void signal_handler(int signal)
{
  gSignalStatus = signal;
}

int main()
{
  //   
  std::signal(SIGINT, signal_handler);

  std::cout << " : " << gSignalStatus << '\n';
  std::cout << " : " << SIGINT << '\n';
  std::raise(SIGINT);
  std::cout << " : " << gSignalStatus << '\n';
}

:

 : 0
 : 2
 : 2

C++23 (ISO/IEC 14882:2023):

17.13.5 [support.signal]

C++20 (ISO/IEC 14882:2020):

17.13.5 [support.signal]

C++17 (ISO/IEC 14882:2017):

21.10.4 [support.signal]

C++:


LWG 3756	C++17	, std::atomic_flag

raise	() []
atomic_signal_fence (C++11)	, () []
C signal







(C++20)

(C++20)
(C++11)





(C++20)


/

(C++11)
(C++11)
(C++11)
(C++17)

cppreference.com

std::signal