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

   1 /*      $NetBSD: net_write.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 write but never return partial data.
  42  */
  43
  44 #ifndef _WIN32
  45
  46 ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
  47 net_write (rk_socket_t fd, const void *buf, size_t nbytes)
  48 {
  49     const char *cbuf = (const char *)buf;
  50     ssize_t count;
  51     size_t rem = nbytes;
  52
  53     while (rem > 0) {
  54         count = write (fd, cbuf, rem);
  55         if (count < 0) {
  56             if (errno == EINTR)
  57                 continue;
  58             else
  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_write(rk_socket_t sock, const void *buf, size_t nbytes)
  71 {
  72     const char *cbuf = (const char *)buf;
  73     ssize_t count;
  74     size_t rem = nbytes;
  75 #ifdef SOCKET_IS_NOT_AN_FD
  76     int use_write = 0;
  77 #endif
  78
  79     while (rem > 0) {
  80 #ifdef SOCKET_IS_NOT_AN_FD
  81         if (use_write)
  82             count = _write (sock, cbuf, rem);
  83         else
  84             count = send (sock, cbuf, rem, 0);
  85
  86         if (use_write == 0 &&
  87             rk_IS_SOCKET_ERROR(count) &&
  88             (rk_SOCK_ERRNO == WSANOTINITIALISED ||
  89              rk_SOCK_ERRNO == WSAENOTSOCK)) {
  90             use_write = 1;
  91
  92             count = _write (sock, cbuf, rem);
  93         }
  94 #else
  95         count = send (sock, cbuf, rem, 0);
  96 #endif
  97         if (count < 0) {
  98             if (errno == EINTR)
  99                 continue;
 100             else
 101                 return count;
 102         }
 103         cbuf += count;
 104         rem -= count;
 105     }
 106     return nbytes;
 107 }
 108
 109 #endif