appl/ftp/common/sockbuf.c

   1 /*
   2  * Copyright (c) 1995, 1996, 1997 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 "common.h"
  35 #ifdef HAVE_SYS_TYPES_H
  36 #include <sys/types.h>
  37 #endif
  38 #ifdef HAVE_SYS_SOCKET_H
  39 #include <sys/socket.h>
  40 #endif
  41
  42 RCSID("$Id$");
  43
  44 void
  45 set_buffer_size(int fd, int read)
  46 {
  47 #if defined(SO_RCVBUF) && defined(SO_SNDBUF) && defined(HAVE_SETSOCKOPT)
  48     int size = 4194304;
  49     int optname = read ? SO_RCVBUF : SO_SNDBUF;
  50
  51 #ifdef HAVE_GETSOCKOPT
  52     int curr=0;
  53     socklen_t optlen;
  54
  55     optlen = sizeof(curr);
  56     if(getsockopt(fd, SOL_SOCKET, optname, (void *)&curr, &optlen) == 0) {
  57         if(curr >= size) {
  58             /* Already large enough */
  59             return;
  60         }
  61     }
  62 #endif /* HAVE_GETSOCKOPT */
  63
  64     while(size >= 131072 &&
  65           setsockopt(fd, SOL_SOCKET, optname, (void *)&size, sizeof(size)) < 0)
  66         size /= 2;
  67 #endif
  68 }
  69
  70