42 lines
1.2 KiB
C
42 lines
1.2 KiB
C
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#include <lib.h>
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#define signal _signal
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#include <signal.h>
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extern _PROTOTYPE(void (*_vectab[_NSIG]), (int)); /* array of funcs to catch signals */
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/* The definition of signal really should be
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* PUBLIC void (*signal(signr, func))()
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* but some compilers refuse to accept this, even though it is correct.
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* The only thing to do if you are stuck with such a defective compiler is
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* change it to
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* PUBLIC void *signal(signr, func)
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* and change ../h/signal.h accordingly.
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*/
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PUBLIC void (*signal(signr, func))()
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int signr; /* which signal is being set */
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_PROTOTYPE( void (*func), (int)); /* pointer to function that catches signal */
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{
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int r;
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_PROTOTYPE( void (*old), (int));
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old = _vectab[signr - 1];
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_M.m6_i1 = signr;
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if (func == SIG_IGN || func == SIG_DFL)
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/* Keep old signal catcher until it is completely de-installed */
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_M.m6_f1 = func;
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else {
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/* Use new signal catcher immediately (old one may not exist) */
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_vectab[signr - 1] = func;
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_M.m6_f1 = _begsig;
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}
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r = _callx(MM, SIGNAL);
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if (r < 0) {
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_vectab[signr - 1] = old;/* undo any pre-installation */
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return((void (*) ()) r);
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}
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_vectab[signr - 1] = func; /* redo any pre-installation */
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if (r == 1) return(SIG_IGN);
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return(old);
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}
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