lib/krb5/net_write.c

   1 /*
   2  * Copyright (c) 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 "krb5_locl.h"
  35
  36 KRB5_LIB_FUNCTION krb5_ssize_t KRB5_LIB_CALL
  37 krb5_net_write (krb5_context context,
  38                 void *p_fd,
  39                 const void *buf,
  40                 size_t len)
  41 {
  42     krb5_socket_t fd = *((krb5_socket_t *)p_fd);
  43     return net_write(fd, buf, len);
  44 }
  45
  46 KRB5_LIB_FUNCTION krb5_ssize_t KRB5_LIB_CALL
  47 krb5_net_write_block(krb5_context context,
  48                      void *p_fd,
  49                      const void *buf,
  50                      size_t len,
  51                      time_t timeout)
  52 {
  53   krb5_socket_t fd = *((krb5_socket_t *)p_fd);
  54   int ret;
  55   struct timeval tv, *tvp;
  56   const char *cbuf = (const char *)buf;
  57   size_t rem = len;
  58   ssize_t count;
  59   fd_set wfds;
  60
  61   do {
  62       FD_ZERO(&wfds);
  63       FD_SET(fd, &wfds);
  64
  65       if (timeout != 0) {
  66           tv.tv_sec = timeout;
  67           tv.tv_usec = 0;
  68           tvp = &tv;
  69       } else
  70           tvp = NULL;
  71
  72       ret = select(fd + 1, NULL, &wfds, NULL, tvp);
  73       if (rk_IS_SOCKET_ERROR(ret)) {
  74           if (rk_SOCK_ERRNO == EINTR)
  75               continue;
  76           return -1;
  77       }
  78
  79 #ifdef HAVE_WINSOCK
  80       if (ret == 0) {
  81           WSASetLastError( WSAETIMEDOUT );
  82           return 0;
  83       }
  84
  85       count = send (fd, cbuf, rem, 0);
  86
  87       if (rk_IS_SOCKET_ERROR(count)) {
  88           return -1;
  89       }
  90
  91 #else
  92       if (ret == 0) {
  93           return 0;
  94       }
  95
  96       if (!FD_ISSET(fd, &wfds)) {
  97           errno = ETIMEDOUT;
  98           return -1;
  99       }
 100
 101       count = write (fd, cbuf, rem);
 102
 103       if (count < 0) {
 104           if (errno == EINTR)
 105               continue;
 106           else
 107               return count;
 108       }
 109
 110 #endif
 111
 112       cbuf += count;
 113       rem -= count;
 114
 115   } while (rem > 0);
 116
 117   return len;
 118 }