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eeb57c17ad
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@102619 13f79535-47bb-0310-9956-ffa450edef68
101 lines
2.8 KiB
C
101 lines
2.8 KiB
C
/* Copyright 1999-2004 The Apache Software Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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test-writev: use this to figure out if your writev() does intelligent
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things on the network. Some writev()s when given multiple buffers
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will break them up into multiple packets, which is a waste.
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Linux prior to 2.0.31 has this problem.
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Solaris 2.5, 2.5.1 doesn't appear to, 2.6 hasn't been tested.
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IRIX 5.3 doesn't have this problem.
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To use this you want to snoop the wire with tcpdump, and then run
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"test-writev a.b.c.d port#" ... against some TCP service on another
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box. For example you can run it against port 80 on another server.
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You want to look to see how many data packets are sent, you're hoping
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only one of size 300 is sent.
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*/
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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#include <sys/uio.h>
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#include <errno.h>
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#ifndef INADDR_NONE
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#define INADDR_NONE (-1ul)
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#endif
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void main( int argc, char **argv )
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{
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struct sockaddr_in server_addr;
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int s;
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struct iovec vector[3];
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char buf[100];
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int i;
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const int just_say_no = 1;
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if( argc != 3 ) {
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usage:
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fprintf( stderr, "usage: test-writev a.b.c.d port#\n" );
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exit( 1 );
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}
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server_addr.sin_family = AF_INET;
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server_addr.sin_addr.s_addr = inet_addr( argv[1] );
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if( server_addr.sin_addr.s_addr == INADDR_NONE ) {
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fprintf( stderr, "bogus address\n" );
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goto usage;
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}
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server_addr.sin_port = htons( atoi( argv[2] ) );
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s = socket( AF_INET, SOCK_STREAM, 0 );
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if( s < 0 ) {
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perror("socket");
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exit(1);
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}
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if( connect( s, (struct sockaddr *)&server_addr, sizeof( server_addr ) )
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!= 0 ) {
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perror("connect");
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exit(1);
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}
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if( setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (char*)&just_say_no,
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sizeof(just_say_no)) != 0 ) {
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perror( "TCP_NODELAY" );
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exit(1);
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}
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/* now build up a two part writev and write it out */
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for( i = 0; i < sizeof( buf ); ++i ) {
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buf[i] = 'x';
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}
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vector[0].iov_base = buf;
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vector[0].iov_len = sizeof(buf);
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vector[1].iov_base = buf;
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vector[1].iov_len = sizeof(buf);
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vector[2].iov_base = buf;
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vector[2].iov_len = sizeof(buf);
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i = writev( s, &vector[0], 3 );
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fprintf( stdout, "i=%d, errno=%d\n", i, errno );
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exit(0);
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}
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