78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
/* exception.h
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*
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* $Id$
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*
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* Copyright 1990, 1991, 1992, 1993, 1994, 1995, Oliver Laumann, Berlin
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* Copyright 2002, 2003 Sam Hocevar <sam@zoy.org>, Paris
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*
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* This software was derived from Elk 1.2, which was Copyright 1987, 1988,
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* 1989, Nixdorf Computer AG and TELES GmbH, Berlin (Elk 1.2 has been written
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* by Oliver Laumann for TELES Telematic Services, Berlin, in a joint project
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* between TELES and Nixdorf Microprocessor Engineering, Berlin).
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*
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* Oliver Laumann, TELES GmbH, Nixdorf Computer AG and Sam Hocevar, as co-
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* owners or individual owners of copyright in this software, grant to any
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* person or company a worldwide, royalty free, license to
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*
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* i) copy this software,
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* ii) prepare derivative works based on this software,
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* iii) distribute copies of this software or derivative works,
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* iv) perform this software, or
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* v) display this software,
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*
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* provided that this notice is not removed and that neither Oliver Laumann
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* nor Teles nor Nixdorf are deemed to have made any representations as to
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* the suitability of this software for any purpose nor are held responsible
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* for any defects of this software.
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*
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* THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
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*/
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extern int Intr_Was_Ignored;
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extern unsigned long Intr_Level;
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#ifdef POSIX_SIGNALS
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extern sigset_t Sigset_Old, Sigset_Block;
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#else
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#ifdef BSD_SIGNALS
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extern int Sigmask_Old, Sigmask_Block;
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#else
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C_LINKAGE_BEGIN
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extern void Intr_Handler P_((int));
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C_LINKAGE_END
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#endif
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#endif
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#ifdef BSD_SIGNALS
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# ifndef sigmask
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# define sigmask(n) (1 << ((n)-1))
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# endif
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#endif
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#define Disable_Interrupts {\
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if (Intr_Level++ == 0) Force_Disable_Interrupts;\
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}
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#define Enable_Interrupts {\
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if (Intr_Level > 0 && --Intr_Level == 0) Force_Enable_Interrupts;\
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}
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#ifdef BSD_SIGNALS
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#define Force_Disable_Interrupts (void)sigblock (Sigmask_Block)
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#define Force_Enable_Interrupts (void)sigsetmask (Sigmask_Old)
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#else
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#ifdef POSIX_SIGNALS
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#define Force_Disable_Interrupts (void)sigprocmask (SIG_BLOCK, &Sigset_Block,\
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(sigset_t *)0)
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#define Force_Enable_Interrupts (void)sigprocmask (SIG_SETMASK, &Sigset_Old,\
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(sigset_t *)0)
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#else
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#define Force_Disable_Interrupts {\
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if (!Intr_Was_Ignored) (void)signal (SIGINT, SIG_IGN);\
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}
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#define Force_Enable_Interrupts {\
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if (!Intr_Was_Ignored) (void)signal (SIGINT, Intr_Handler);\
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}
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#endif
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#endif
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