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Filename : 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 <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

#ifdef __cplusplus
}
#endif
#endif  // !Py_INTERNAL_SIGNAL_H