ref: 333468d668d5079bcf7651d4e25d688b6e7a833e
dir: /sys/src/libc/9sys/dirfstat.c/
#include <u.h> #include <libc.h> #include <fcall.h> enum { DIRSIZE = STATFIXLEN + 16 * 4 /* enough for encoded stat buf + some reasonable strings */ }; Dir* dirfstat(int fd) { Dir *d; uchar *buf; int n, nd, i; nd = DIRSIZE; for(i=0; i<2; i++){ /* should work by the second try */ d = malloc(sizeof(Dir) + BIT16SZ + nd); if(d == nil) return nil; buf = (uchar*)&d[1]; n = fstat(fd, buf, BIT16SZ+nd); if(n < BIT16SZ){ free(d); return nil; } nd = GBIT16(buf); /* upper bound on size of Dir + strings */ if(nd <= n){ convM2D(buf, n, d, (char*)&d[1]); return d; } /* else sizeof(Dir)+BIT16SZ+nd is plenty */ free(d); } return nil; }