lib/roken/net_write.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 write but blocking sockets never return partial data, i.e. we retry on
  40  * EINTR.  With non-blocking sockets (EWOULDBLOCK or EAGAIN) we return the
  41  * number of bytes written.
  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             switch (errno) {
  57             case EINTR:
  58                 continue;
  59 #if defined(EAGAIN) && EAGAIN != EWOULDBLOCK
  60             case EAGAIN:
  61 #endif
  62             case EWOULDBLOCK:
  63                 return nbytes - rem;
  64             default:
  65                 return count;
  66             }
  67         }
  68         cbuf += count;
  69         rem -= count;
  70     }
  71     return nbytes;
  72 }
  73
  74 #else /* defined(_WIN32) */
  75
  76 ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
  77 net_write(rk_socket_t sock, const void *buf, size_t nbytes)
  78 {
  79     const char *cbuf = (const char *)buf;
  80     ssize_t count;
  81     size_t rem = nbytes;
  82 #ifdef SOCKET_IS_NOT_AN_FD
  83     int use_write = 0;
  84 #endif
  85
  86     while (rem > 0) {
  87 #ifdef SOCKET_IS_NOT_AN_FD
  88         if (use_write)
  89             count = _write (sock, cbuf, rem);
  90         else
  91             count = send (sock, cbuf, rem, 0);
  92
  93         if (use_write == 0 &&
  94             rk_IS_SOCKET_ERROR(count) &&
  95             (rk_SOCK_ERRNO == WSANOTINITIALISED ||
  96              rk_SOCK_ERRNO == WSAENOTSOCK)) {
  97             use_write = 1;
  98
  99             count = _write (sock, cbuf, rem);
 100         }
 101 #else
 102         count = send (sock, cbuf, rem, 0);
 103 #endif
 104         if (count < 0) {
 105 #ifdef SOCKET_IS_NOT_AN_FD
 106             if (!use_write) {
 107                 switch (rk_SOCK_ERRNO) {
 108                 case WSAEINTR:
 109                     continue;
 110                 case WSAEWOULDBLOCK:
 111                     return nbytes - rem;
 112                 default:
 113                     return count;
 114                 }
 115             } else
 116 #endif
 117             {
 118                 switch (errno) {
 119                 case EINTR:
 120                     continue;
 121                 case EWOULDBLOCK:
 122                     return nbytes - rem;
 123                 default:
 124                     return count;
 125                 }
 126             }
 127         }
 128         cbuf += count;
 129         rem -= count;
 130     }
 131     return nbytes;
 132 }
 133
 134 #endif