68 lines
1.3 KiB
C
68 lines
1.3 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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extern void (*_jehanne_onexit)(void);
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#define NEXIT 33
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typedef struct Onex Onex;
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struct Onex{
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void (*f)(void);
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int pid;
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};
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static Lock onexlock;
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Onex onex[NEXIT];
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static void
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onexit(void)
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{
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int i, pid;
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void (*f)(void);
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pid = jehanne_getpid();
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for(i = nelem(onex)-1; i >= 0; i--)
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if((f = onex[i].f) != nil && onex[i].pid == pid) {
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onex[i].f = nil;
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(*f)();
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}
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}
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int
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jehanne_atexit(void (*f)(void))
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{
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int i;
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_jehanne_onexit = onexit;
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jehanne_lock(&onexlock);
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for(i=0; i<NEXIT; i++)
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if(onex[i].f == 0) {
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onex[i].pid = jehanne_getpid();
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onex[i].f = f;
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jehanne_unlock(&onexlock);
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return 1;
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}
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jehanne_unlock(&onexlock);
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return 0;
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}
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void
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jehanne_atexitdont(void (*f)(void))
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{
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int i, pid;
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pid = jehanne_getpid();
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for(i=0; i<NEXIT; i++)
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if(onex[i].f == f && onex[i].pid == pid)
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onex[i].f = 0;
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}
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