68 lines
1.2 KiB
C
68 lines
1.2 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <libc.h>
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#define NFN 33
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static int (*onnot[NFN])(void*, char*);
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static Lock onnotlock;
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static
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void
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notifier(void *v, char *s)
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{
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int i;
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for(i=0; i<NFN; i++)
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if(onnot[i] && ((*onnot[i])(v, s))){
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sys_noted(NCONT);
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return;
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}
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sys_noted(NDFLT);
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}
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int
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jehanne_atnotify(int (*f)(void*, char*), int in)
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{
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int i, n, ret;
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static int init;
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if(!init){
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sys_notify(notifier);
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init = 1; /* assign = */
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}
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ret = 0;
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jehanne_lock(&onnotlock);
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if(in){
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for(i=0; i<NFN; i++)
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if(onnot[i] == 0) {
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onnot[i] = f;
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ret = 1;
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break;
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}
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}else{
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n = 0;
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for(i=0; i<NFN; i++)
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if(onnot[i]){
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if(ret==0 && onnot[i]==f){
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onnot[i] = 0;
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ret = 1;
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}else
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n++;
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}
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if(n == 0){
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init = 0;
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sys_notify(0);
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}
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}
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jehanne_unlock(&onnotlock);
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return ret;
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}
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