crypto/dist/heimdal/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("$Heimdal: net_write.c 13863 2004-05-25 21:46:46Z lha $"
  37         "$NetBSD$");
  38
  39 krb5_ssize_t KRB5_LIB_FUNCTION
  40 krb5_net_write (krb5_context context,
  41                 void *p_fd,
  42                 const void *buf,
  43                 size_t len)
  44 {
  45   int fd = *((int *)p_fd);
  46
  47   return net_write (fd, buf, len);
  48 }
  49
  50 krb5_ssize_t KRB5_LIB_FUNCTION
  51 krb5_net_write_block(krb5_context context,
  52                      void *p_fd,
  53                      const void *buf,
  54                      size_t len,
  55                      time_t timeout)
  56 {
  57   int fd = *((int *)p_fd);
  58   int ret;
  59   struct timeval tv, *tvp;
  60   const char *cbuf = (const char *)buf;
  61   size_t rem = len;
  62   ssize_t count;
  63   fd_set wfds;
  64
  65   do {
  66       FD_ZERO(&wfds);
  67       FD_SET(fd, &wfds);
  68
  69       if (timeout != 0) {
  70           tv.tv_sec = timeout;
  71           tv.tv_usec = 0;
  72           tvp = &tv;
  73       } else
  74           tvp = NULL;
  75
  76       ret = select(fd + 1, NULL, &wfds, NULL, tvp);
  77       if (ret < 0) {
  78           if (errno == EINTR)
  79               continue;
  80           return -1;
  81       } else if (ret == 0)
  82           return 0;
  83
  84       if (!FD_ISSET(fd, &wfds)) {
  85           errno = ETIMEDOUT;
  86           return -1;
  87       }
  88
  89 #ifdef WIN32
  90       count = send (fd, cbuf, rem, 0);
  91 #else
  92       count = write (fd, cbuf, rem);
  93 #endif
  94       if (count < 0) {
  95           if (errno == EINTR)
  96               continue;
  97           else
  98               return count;
  99       }
 100       cbuf += count;
 101       rem -= count;
 102
 103   } while (rem > 0);
 104
 105   return len;
 106 }