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pycore_signal.h
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// Define Py_NSIG constant for signal handling. #ifndef Py_INTERNAL_SIGNAL_H #define Py_INTERNAL_SIGNAL_H #ifdef __cplusplus extern "C" { #endif #ifndef Py_BUILD_CORE # error "this header requires Py_BUILD_CORE define" #endif #include "pycore_atomic.h" // _Py_atomic_address #include <signal.h> // NSIG #ifdef _SIG_MAXSIG // gh-91145: On FreeBSD, <signal.h> defines NSIG as 32: it doesn't include // realtime signals: [SIGRTMIN,SIGRTMAX]. Use _SIG_MAXSIG instead. For // example on x86-64 FreeBSD 13, SIGRTMAX is 126 and _SIG_MAXSIG is 128. # define Py_NSIG _SIG_MAXSIG #elif defined(NSIG) # define Py_NSIG NSIG #elif defined(_NSIG) # define Py_NSIG _NSIG // BSD/SysV #elif defined(_SIGMAX) # define Py_NSIG (_SIGMAX + 1) // QNX #elif defined(SIGMAX) # define Py_NSIG (SIGMAX + 1) // djgpp #else # define Py_NSIG 64 // Use a reasonable default value #endif #define INVALID_FD (-1) struct _signals_runtime_state { volatile struct { _Py_atomic_int tripped; /* func is atomic to ensure that PyErr_SetInterrupt is async-signal-safe * (even though it would probably be otherwise, anyway). */ _Py_atomic_address func; } handlers[Py_NSIG]; volatile struct { #ifdef MS_WINDOWS /* This would be "SOCKET fd" if <winsock2.h> were always included. It isn't so we must cast to SOCKET where appropriate. */ volatile int fd; #elif defined(__VXWORKS__) int fd; #else sig_atomic_t fd; #endif int warn_on_full_buffer; #ifdef MS_WINDOWS int use_send; #endif } wakeup; /* Speed up sigcheck() when none tripped */ _Py_atomic_int is_tripped; /* These objects necessarily belong to the main interpreter. */ PyObject *default_handler; PyObject *ignore_handler; #ifdef MS_WINDOWS /* This would be "HANDLE sigint_event" if <windows.h> were always included. It isn't so we must cast to HANDLE everywhere "sigint_event" is used. */ void *sigint_event; #endif /* True if the main interpreter thread exited due to an unhandled * KeyboardInterrupt exception, suggesting the user pressed ^C. */ int unhandled_keyboard_interrupt; }; #ifdef MS_WINDOWS # define _signals_WAKEUP_INIT \ {.fd = INVALID_FD, .warn_on_full_buffer = 1, .use_send = 0} #else # define _signals_WAKEUP_INIT \ {.fd = INVALID_FD, .warn_on_full_buffer = 1} #endif #define _signals_RUNTIME_INIT \ { \ .wakeup = _signals_WAKEUP_INIT, \ } #ifdef __cplusplus } #endif #endif // !Py_INTERNAL_SIGNAL_H