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- #include <u.h>
- #include <libc.h>
- #define NEXIT 33
- static Lock onexlock;
- static struct
- {
- void (*f)(void);
- int pid;
- }onex[NEXIT];
- atexit(void (*f)(void))
- {
- int i;
- lock(&onexlock);
- for(i=0; i<NEXIT; i++)
- if(onex[i].f == 0) {
- onex[i].pid = getpid();
- onex[i].f = f;
- unlock(&onexlock);
- return 1;
- }
- unlock(&onexlock);
- return 0;
- }
- void
- atexitdont(void (*f)(void))
- {
- int i, pid;
- pid = getpid();
- for(i=0; i<NEXIT; i++)
- if(onex[i].f == f && onex[i].pid == pid)
- onex[i].f = 0;
- }
- void
- exits(char *s)
- {
- int i, pid;
- void (*f)(void);
- pid = getpid();
- for(i = NEXIT-1; i >= 0; i--)
- if((f = onex[i].f) && pid == onex[i].pid) {
- onex[i].f = 0;
- (*f)();
- }
- _exits(s);
- }
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