1 /*
2 * lib/krb5/os/net_read.c
3 *
4 * Copyright 1987, 1988, 1990 by the Massachusetts Institute of Technology.
5 * All Rights Reserved.
6 *
7 * Export of this software from the United States of America may
8 * require a specific license from the United States Government.
9 * It is the responsibility of any person or organization contemplating
10 * export to obtain such a license before exporting.
11 *
12 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
13 * distribute this software and its documentation for any purpose and
14 * without fee is hereby granted, provided that the above copyright
15 * notice appear in all copies and that both that copyright notice and
16 * this permission notice appear in supporting documentation, and that
17 * the name of M.I.T. not be used in advertising or publicity pertaining
18 * to distribution of the software without specific, written prior
19 * permission. Furthermore if you modify this software you must label
20 * your software as modified software and not distribute it in such a
21 * fashion that it might be confused with the original M.I.T. software.
22 * M.I.T. makes no representations about the suitability of
23 * this software for any purpose. It is provided "as is" without express
24 * or implied warranty.
25 *
26 */
27
28 #include "k5-int.h"
29
30 /*
31 * krb5_net_read() reads from the file descriptor "fd" to the buffer
32 * "buf", until either 1) "len" bytes have been read or 2) cannot
33 * read anymore from "fd". It returns the number of bytes read
34 * or a read() error. (The calling interface is identical to
35 * read(2).)
36 *
37 * XXX must not use non-blocking I/O
38 */
39
40 /*ARGSUSED*/
41 int
krb5_net_read(krb5_context context,int fd,register char * buf,register int len)42 krb5_net_read(krb5_context context, int fd, register char *buf, register int len)
43 {
44 int cc, len2 = 0;
45
46 do {
47 cc = SOCKET_READ((SOCKET)fd, buf, len);
48 if (cc < 0) {
49 if (SOCKET_ERRNO == SOCKET_EINTR)
50 continue;
51
52 /* XXX this interface sucks! */
53 errno = SOCKET_ERRNO;
54
55 return(cc); /* errno is already set */
56 }
57 else if (cc == 0) {
58 return(len2);
59 } else {
60 buf += cc;
61 len2 += cc;
62 len -= cc;
63 }
64 } while (len > 0);
65 return(len2);
66 }
67