crypto/external/bsd/heimdal/dist/lib/roken/net_read.c

   1 /*      $NetBSD: net_read.c,v 1.1.1.1 2011/04/13 18:15:42 elric Exp $   */
   2
   3 /*
   4  * Copyright (c) 1995, 1996, 1997, 1998 Kungliga Tekniska Högskolan
   5  * (Royal Institute of Technology, Stockholm, Sweden).
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <config.h>
  37
  38 #include <krb5/roken.h>
  39
  40 /*
  41  * Like read but never return partial data.
  42  */
  43
  44 #ifndef _WIN32
  45
  46 ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
  47 net_read (rk_socket_t fd, void *buf, size_t nbytes)
  48 {
  49     char *cbuf = (char *)buf;
  50     ssize_t count;
  51     size_t rem = nbytes;
  52
  53     while (rem > 0) {
  54         count = read (fd, cbuf, rem);
  55         if (count < 0) {
  56             if (errno == EINTR)
  57                 continue;
  58             else
  59                 return count;
  60         } else if (count == 0) {
  61             return count;
  62         }
  63         cbuf += count;
  64         rem -= count;
  65     }
  66     return nbytes;
  67 }
  68
  69 #else
  70
  71 ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
  72 net_read(rk_socket_t sock, void *buf, size_t nbytes)
  73 {
  74     char *cbuf = (char *)buf;
  75     ssize_t count;
  76     size_t rem = nbytes;
  77
  78 #ifdef SOCKET_IS_NOT_AN_FD
  79     int use_read = 0;
  80 #endif
  81
  82     while (rem > 0) {
  83 #ifdef SOCKET_IS_NOT_AN_FD
  84         if (use_read)
  85             count = _read (sock, cbuf, rem);
  86         else
  87             count = recv (sock, cbuf, rem, 0);
  88
  89         if (use_read == 0 &&
  90             rk_IS_SOCKET_ERROR(count) &&
  91             (rk_SOCK_ERRNO == WSANOTINITIALISED ||
  92              rk_SOCK_ERRNO == WSAENOTSOCK)) {
  93             use_read = 1;
  94
  95             count = _read (sock, cbuf, rem);
  96         }
  97 #else
  98         count = recv (sock, cbuf, rem, 0);
  99 #endif
 100         if (count < 0) {
 101
 102             /* With WinSock, the error EINTR (WSAEINTR), is used to
 103                indicate that a blocking call was cancelled using
 104                WSACancelBlockingCall(). */
 105
 106 #ifndef HAVE_WINSOCK
 107             if (rk_SOCK_ERRNO == EINTR)
 108                 continue;
 109 #endif
 110             return count;
 111         } else if (count == 0) {
 112             return count;
 113         }
 114         cbuf += count;
 115         rem -= count;
 116     }
 117     return nbytes;
 118 }
 119
 120 #endif