src/external/heimdal/roken/net_read.c

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