1 #pragma ident "%Z%%M% %I% %E% SMI" 2 /* 3 * lib/krb5/os/net_read.c 4 * 5 * Copyright 1987, 1988, 1990 by the Massachusetts Institute of Technology. 6 * All Rights Reserved. 7 * 8 * Export of this software from the United States of America may 9 * require a specific license from the United States Government. 10 * It is the responsibility of any person or organization contemplating 11 * export to obtain such a license before exporting. 12 * 13 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 14 * distribute this software and its documentation for any purpose and 15 * without fee is hereby granted, provided that the above copyright 16 * notice appear in all copies and that both that copyright notice and 17 * this permission notice appear in supporting documentation, and that 18 * the name of M.I.T. not be used in advertising or publicity pertaining 19 * to distribution of the software without specific, written prior 20 * permission. Furthermore if you modify this software you must label 21 * your software as modified software and not distribute it in such a 22 * fashion that it might be confused with the original M.I.T. software. 23 * M.I.T. makes no representations about the suitability of 24 * this software for any purpose. It is provided "as is" without express 25 * or implied warranty. 26 * 27 */ 28 29 #define NEED_LOWLEVEL_IO 30 #define NEED_SOCKETS 31 #include <k5-int.h> 32 33 /* 34 * krb5_net_read() reads from the file descriptor "fd" to the buffer 35 * "buf", until either 1) "len" bytes have been read or 2) cannot 36 * read anymore from "fd". It returns the number of bytes read 37 * or a read() error. (The calling interface is identical to 38 * read(2).) 39 * 40 * XXX must not use non-blocking I/O 41 */ 42 43 /*ARGSUSED*/ 44 int 45 krb5_net_read(context, fd, buf, len) 46 krb5_context context; 47 int fd; 48 register char *buf; 49 register int len; 50 { 51 int cc, len2 = 0; 52 53 do { 54 cc = SOCKET_READ((SOCKET)fd, buf, len); 55 if (cc < 0) { 56 if (SOCKET_ERRNO == SOCKET_EINTR) 57 continue; 58 59 /* XXX this interface sucks! */ 60 errno = SOCKET_ERRNO; 61 62 return(cc); /* errno is already set */ 63 } 64 else if (cc == 0) { 65 return(len2); 66 } else { 67 buf += cc; 68 len2 += cc; 69 len -= cc; 70 } 71 } while (len > 0); 72 return(len2); 73 } 74