tuid.c - plan9port - [fork] Plan 9 from user space
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       ---
       tuid.c (519B)
       ---
            1 #include <u.h>
            2 #include <libc.h>
            3 #include <fcall.h>
            4 #include <thread.h>
            5 #include <9p.h>
            6 
            7 /*
            8  * simplistic permission checking.  assume that
            9  * each user is the leader of her own group.
           10  */
           11 int
           12 hasperm(File *f, char *uid, int p)
           13 {
           14         int m;
           15 
           16         m = f->dir.mode & 7;        /* other */
           17         if((p & m) == p)
           18                 return 1;
           19 
           20         if(strcmp(f->dir.uid, uid) == 0) {
           21                 m |= (f->dir.mode>>6) & 7;
           22                 if((p & m) == p)
           23                         return 1;
           24         }
           25 
           26         if(strcmp(f->dir.gid, uid) == 0) {
           27                 m |= (f->dir.mode>>3) & 7;
           28                 if((p & m) == p)
           29                         return 1;
           30         }
           31 
           32         return 0;
           33 }