38 lines
675 B
C
38 lines
675 B
C
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#include <errno.h>
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extern int errno;
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#define MAXSIG 128
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void (*_sig_funcs[MAXSIG])();
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void _sig_catch();
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void (*_signal())();
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void
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(*
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signal(sig, handler))()
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void (*handler)();
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{
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void (*old)(), (*retval)();
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if (sig <= 0 || sig > MAXSIG) {
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errno = EINVAL;
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return (void (*)()) -1;
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}
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if ((long) handler >= 0 && (long) handler <= 2) {
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retval = _signal(sig, handler);
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if (retval != (void (*)()) -1) {
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old = _sig_funcs[sig-1];
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_sig_funcs[sig-1] = handler;
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return old;
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}
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return retval;
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}
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retval = _signal(sig, _sig_catch);
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if (retval != (void (*)()) -1) {
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old = _sig_funcs[sig-1];
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_sig_funcs[sig-1] = handler;
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return old;
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}
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return retval;
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}
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