/*--------------------------------------------------------------- * Copyright (c) 1999,2000,2001,2002,2003 * The Board of Trustees of the University of Illinois * All Rights Reserved. *--------------------------------------------------------------- * Permission is hereby granted, free of charge, to any person * obtaining a copy of this software (Iperf) and associated * documentation files (the "Software"), to deal in the Software * without restriction, including without limitation the * rights to use, copy, modify, merge, publish, distribute, * sublicense, and/or sell copies of the Software, and to permit * persons to whom the Software is furnished to do * so, subject to the following conditions: * * * Redistributions of source code must retain the above * copyright notice, this list of conditions and * the following disclaimers. * * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimers in the documentation and/or other materials * provided with the distribution. * * * Neither the names of the University of Illinois, NCSA, * nor the names of its contributors may be used to endorse * or promote products derived from this Software without * specific prior written permission. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE CONTIBUTORS OR COPYRIGHT * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * ________________________________________________________________ * National Laboratory for Applied Network Research * National Center for Supercomputing Applications * University of Illinois at Urbana-Champaign * http://www.ncsa.uiuc.edu * ________________________________________________________________ * * tcp_window_size.c * by Mark Gates <mgates@nlanr.net> * ------------------------------------------------------------------- * set/getsockopt
* ------------------------------------------------------------------- */
#include"headers.h"
#include"util.h"
#ifdef __cplusplus extern"C" { #endif
/* ------------------------------------------------------------------- * If inTCPWin > 0, set the TCP window size (via the socket buffer * sizes) for inSock. Otherwise leave it as the system default. * * This must be called prior to calling listen() or connect() on * the socket, for TCP window sizes > 64 KB to be effective. * * This now works on UNICOS also, by setting TCP_WINSHIFT. * This now works on AIX, by enabling RFC1323. * returns -1 on error, 0 on no error.
* ------------------------------------------------------------------- */
int setsock_tcp_windowsize( int inSock, int inTCPWin, int inSend ) { #ifdef SO_SNDBUF int rc; int newTCPWin;
assert( inSock >= 0 );
if ( inTCPWin > 0 ) {
#ifdef TCP_WINSHIFT
/* UNICOS requires setting the winshift explicitly */ if ( inTCPWin > 65535 ) { int winShift = 0; int scaledWin = inTCPWin >> 16; while ( scaledWin > 0 ) {
scaledWin >>= 1;
winShift++;
}
/* Note: you cannot verify TCP window shift, since it returns
* a structure and not the same integer we use to set it. (ugh) */
} #endif/* TCP_WINSHIFT */
#ifdef TCP_RFC1323 /* On AIX, RFC 1323 extensions can be set system-wide, * using the 'no' network options command. But we can also set them
* per-socket, so let's try just in case. */ if ( inTCPWin > 65535 ) { /* enable RFC 1323 */ int on = 1;
rc = setsockopt( inSock, IPPROTO_TCP, TCP_RFC1323,
(char*) &on, sizeof( on )); if ( rc < 0 ) { return rc;
}
} #endif/* TCP_RFC1323 */
if ( !inSend ) { /* receive buffer -- set * note: results are verified after connect() or listen(),
* since some OS's don't show the corrected value until then. */
newTCPWin = inTCPWin;
rc = setsockopt( inSock, SOL_SOCKET, SO_RCVBUF,
(char*) &newTCPWin, sizeof( newTCPWin ));
} else { /* send buffer -- set * note: results are verified after connect() or listen(),
* since some OS's don't show the corrected value until then. */
newTCPWin = inTCPWin;
rc = setsockopt( inSock, SOL_SOCKET, SO_SNDBUF,
(char*) &newTCPWin, sizeof( newTCPWin ));
} if ( rc < 0 ) { return rc;
}
} #endif/* SO_SNDBUF */
return 0;
} /* end setsock_tcp_windowsize */
/* ------------------------------------------------------------------- * returns the TCP window size (on the sending buffer, SO_SNDBUF), * or -1 on error.
* ------------------------------------------------------------------- */
int getsock_tcp_windowsize( int inSock, int inSend ) { int theTCPWin = 0;
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