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extern int Intr_Was_Ignored;
extern unsigned long Intr_Level;
#ifdef POSIX_SIGNALS
extern sigset_t Sigset_Old, Sigset_Block;
#else
#ifdef BSD_SIGNALS
extern int Sigmask_Old, Sigmask_Block;
#else
C_LINKAGE_BEGIN
extern void Intr_Handler P_((int));
C_LINKAGE_END
#endif
#endif
#ifdef BSD_SIGNALS
# ifndef sigmask
# define sigmask(n) (1 << ((n)-1))
# endif
#endif
#define Disable_Interrupts {\
if (Intr_Level++ == 0) Force_Disable_Interrupts;\
}
#define Enable_Interrupts {\
if (Intr_Level > 0 && --Intr_Level == 0) Force_Enable_Interrupts;\
}
#ifdef BSD_SIGNALS
#define Force_Disable_Interrupts (void)sigblock (Sigmask_Block)
#define Force_Enable_Interrupts (void)sigsetmask (Sigmask_Old)
#else
#ifdef POSIX_SIGNALS
#define Force_Disable_Interrupts (void)sigprocmask (SIG_BLOCK, &Sigset_Block,\
(sigset_t *)0)
#define Force_Enable_Interrupts (void)sigprocmask (SIG_SETMASK, &Sigset_Old,\
(sigset_t *)0)
#else
#define Force_Disable_Interrupts {\
if (!Intr_Was_Ignored) (void)signal (SIGINT, SIG_IGN);\
}
#define Force_Enable_Interrupts {\
if (!Intr_Was_Ignored) (void)signal (SIGINT, Intr_Handler);\
}
#endif
#endif
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