tatexit.c - plan9port - [fork] Plan 9 from user space
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       ---
       tatexit.c (746B)
       ---
            1 #include <u.h>
            2 #include <libc.h>
            3 
            4 #define        NEXIT        33
            5 
            6 static Lock onexlock;
            7 static struct
            8 {
            9         void        (*f)(void);
           10         int        pid;
           11 }onex[NEXIT];
           12 
           13 int
           14 atexit(void (*f)(void))
           15 {
           16         int i;
           17 
           18         lock(&onexlock);
           19         for(i=0; i<NEXIT; i++)
           20                 if(onex[i].f == 0) {
           21                         onex[i].pid = getpid();
           22                         onex[i].f = f;
           23                         unlock(&onexlock);
           24                         return 1;
           25                 }
           26         unlock(&onexlock);
           27         return 0;
           28 }
           29 
           30 void
           31 atexitdont(void (*f)(void))
           32 {
           33         int i, pid;
           34 
           35         pid = getpid();
           36         for(i=0; i<NEXIT; i++)
           37                 if(onex[i].f == f && onex[i].pid == pid)
           38                         onex[i].f = 0;
           39 }
           40 
           41 void
           42 exits(char *s)
           43 {
           44         int i, pid;
           45         void (*f)(void);
           46 
           47         pid = getpid();
           48         for(i = NEXIT-1; i >= 0; i--)
           49                 if((f = onex[i].f) && pid == onex[i].pid) {
           50                         onex[i].f = 0;
           51                         (*f)();
           52                 }
           53         if(s == 0 || *s == 0)
           54                 exit(0);
           55         exit(exitcode(s));
           56 }