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 never return partial data.
  40  */
  41
  42 #ifndef _WIN32
  43
  44 ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
  45 net_write (rk_socket_t fd, const void *buf, size_t nbytes)
  46 {
  47     const char *cbuf = (const char *)buf;
  48     ssize_t count;
  49     size_t rem = nbytes;
  50
  51     while (rem > 0) {
  52         count = write (fd, cbuf, rem);
  53         if (count < 0) {
  54             if (errno == EINTR)
  55                 continue;
  56             else
  57                 return count;
  58         }
  59         cbuf += count;
  60         rem -= count;
  61     }
  62     return nbytes;
  63 }
  64
  65 #else
  66
  67 ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
  68 net_write(rk_socket_t sock, const void *buf, size_t nbytes)
  69 {
  70     const char *cbuf = (const char *)buf;
  71     ssize_t count;
  72     size_t rem = nbytes;
  73 #ifdef SOCKET_IS_NOT_AN_FD
  74     int use_write = 0;
  75 #endif
  76
  77     while (rem > 0) {
  78 #ifdef SOCKET_IS_NOT_AN_FD
  79         if (use_write)
  80             count = _write (sock, cbuf, rem);
  81         else
  82             count = send (sock, cbuf, rem, 0);
  83
  84         if (use_write == 0 &&
  85             rk_IS_SOCKET_ERROR(count) &&
  86             (rk_SOCK_ERRNO == WSANOTINITIALISED ||
  87              rk_SOCK_ERRNO == WSAENOTSOCK)) {
  88             use_write = 1;
  89
  90             count = _write (sock, cbuf, rem);
  91         }
  92 #else
  93         count = send (sock, cbuf, rem, 0);
  94 #endif
  95         if (count < 0) {
  96             if (errno == EINTR)
  97                 continue;
  98             else
  99                 return count;
 100         }
 101         cbuf += count;
 102         rem -= count;
 103     }
 104     return nbytes;
 105 }
 106
 107 #endif