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 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