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