tpriv.c - plan9port - [fork] Plan 9 from user space
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       ---
       tpriv.c (376B)
       ---
            1 #include <u.h>
            2 #include <libc.h>
            3 #include "9proc.h"
            4 
            5 static Lock privlock;
            6 static ulong privmap;
            7 
            8 int
            9 privalloc(void)
           10 {
           11         int i;
           12 
           13         lock(&privlock);
           14         for(i=0; i<NPRIV; i++)
           15                 if((privmap&(1<<i)) == 0){
           16                         privmap |= (1<<i);
           17                         unlock(&privlock);
           18                         return i;
           19                 }
           20         unlock(&privlock);
           21         return -1;
           22 }
           23 
           24 void**
           25 privmem(int i)
           26 {
           27         Uproc *up;
           28 
           29         up = _p9uproc(0);
           30         return &up->priv[i];
           31 }