Plan 9 from Bell Labs’s /usr/web/sources/plan9/sys/src/ape/lib/ap/stdio/atexit.c

Copyright © 2021 Plan 9 Foundation.
Distributed under the MIT License.
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#include <unistd.h>
#define	NONEXIT	34
extern void (*_atexitfns[NONEXIT])(void);

int
atexit(void (*f)(void))
{
	int i;
	for(i=0; i<NONEXIT; i++)
		if(!_atexitfns[i]){
			_atexitfns[i] = f;
			return(0);
		}
	return(1);
}

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