26 lines
561 B
C
26 lines
561 B
C
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static long masks[32];
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static long flags[32];
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int (*
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signal(sig,handler))()
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int (*handler)();
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{
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struct {
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int (*sv_handler)();
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long sv_mask;
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long sv_flags;
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} v, ov;
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v.sv_handler = handler;
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v.sv_mask = masks[sig];
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v.sv_flags = flags[sig];
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if (sigvec(sig,&v, &ov) < 0) return (int (*)()) -1;
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if (v.sv_mask != ov.sv_mask || v.sv_flags != ov.sv_flags) {
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v.sv_mask = ov.sv_mask;
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masks[sig] = ov.sv_mask;
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v.sv_flags = ov.sv_flags;
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flags[sig] = ov.sv_flags;
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if (sigvec(sig,&v,(char *) 0) < 0) return (int (*)()) -1;
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}
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return ov.sv_handler;
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}
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