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 RCSID("$Id$");
  37
  38 krb5_ssize_t KRB5_LIB_FUNCTION
  39 krb5_net_write (krb5_context context,
  40                 void *p_fd,
  41                 const void *buf,
  42                 size_t len)
  43 {
  44   int fd = *((int *)p_fd);
  45
  46   return net_write (fd, buf, len);
  47 }
  48
  49 krb5_ssize_t KRB5_LIB_FUNCTION
  50 krb5_net_write_block(krb5_context context,
  51                      void *p_fd,
  52                      const void *buf,
  53                      size_t len,
  54                      time_t timeout)
  55 {
  56   int fd = *((int *)p_fd);
  57   int ret;
  58   struct timeval tv, *tvp;
  59   const char *cbuf = (const char *)buf;
  60   size_t rem = len;
  61   ssize_t count;
  62   fd_set wfds;
  63
  64   do {
  65       FD_ZERO(&wfds);
  66       FD_SET(fd, &wfds);
  67
  68       if (timeout != 0) {
  69           tv.tv_sec = timeout;
  70           tv.tv_usec = 0;
  71           tvp = &tv;
  72       } else
  73           tvp = NULL;
  74
  75       ret = select(fd + 1, NULL, &wfds, NULL, tvp);
  76       if (ret < 0) {
  77           if (errno == EINTR)
  78               continue;
  79           return -1;
  80       } else if (ret == 0)
  81           return 0;
  82
  83       if (!FD_ISSET(fd, &wfds)) {
  84           errno = ETIMEDOUT;
  85           return -1;
  86       }
  87
  88 #ifdef WIN32
  89       count = send (fd, cbuf, rem, 0);
  90 #else
  91       count = write (fd, cbuf, rem);
  92 #endif
  93       if (count < 0) {
  94           if (errno == EINTR)
  95               continue;
  96           else
  97               return count;
  98       }
  99       cbuf += count;
 100       rem -= count;
 101
 102   } while (rem > 0);
 103
 104   return len;
 105 }