1 b4705757 2004-02-29 devnull #include <u.h>
 2 b4705757 2004-02-29 devnull #include <libc.h>
 3 b4705757 2004-02-29 devnull #include <fcall.h>
 4 b4705757 2004-02-29 devnull #include <thread.h>
 5 b4705757 2004-02-29 devnull 
 6 b4705757 2004-02-29 devnull int
 7 b4705757 2004-02-29 devnull threadread9pmsg(int fd, void *abuf, uint n)
 8 b4705757 2004-02-29 devnull {
 9 b4705757 2004-02-29 devnull 	int m, len;
10 b4705757 2004-02-29 devnull 	uchar *buf;
11 b4705757 2004-02-29 devnull 
12 b4705757 2004-02-29 devnull 	buf = abuf;
13 b4705757 2004-02-29 devnull 
14 b4705757 2004-02-29 devnull 	/* read count */
15 b4705757 2004-02-29 devnull 	m = threadreadn(fd, buf, BIT32SZ);
16 b4705757 2004-02-29 devnull 	if(m != BIT32SZ){
17 b4705757 2004-02-29 devnull 		if(m < 0)
18 b4705757 2004-02-29 devnull 			return -1;
19 b4705757 2004-02-29 devnull 		return 0;
20 b4705757 2004-02-29 devnull 	}
21 b4705757 2004-02-29 devnull 
22 b4705757 2004-02-29 devnull 	len = GBIT32(buf);
23 b4705757 2004-02-29 devnull 	if(len <= BIT32SZ || len > n){
24 b4705757 2004-02-29 devnull 		werrstr("bad length in 9P2000 message header");
25 b4705757 2004-02-29 devnull 		return -1;
26 b4705757 2004-02-29 devnull 	}
27 b4705757 2004-02-29 devnull 	len -= BIT32SZ;
28 b4705757 2004-02-29 devnull 	m = threadreadn(fd, buf+BIT32SZ, len);
29 b4705757 2004-02-29 devnull 	if(m < len)
30 b4705757 2004-02-29 devnull 		return 0;
31 b4705757 2004-02-29 devnull 	return BIT32SZ+m;
32 b4705757 2004-02-29 devnull }