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/*
* The Spread Toolkit.
*
* The contents of this file are subject to the Spread Open-Source
* License, Version 1.0 (the ``License''); you may not use
* this file except in compliance with the License. You may obtain a
* copy of the License at:
*
* http://www.spread.org/license/
*
* or in the file ``license.txt'' found in this distribution.
*
* Software distributed under the License is distributed on an AS IS basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Creators of Spread are:
* Yair Amir, Michal Miskin-Amir, Jonathan Stanton.
*
* Copyright (C) 1993-2004 Spread Concepts LLC <spread@spreadconcepts.com>
*
* All Rights Reserved.
*
* Major Contributor(s):
* ---------------
* Cristina Nita-Rotaru crisn@cs.purdue.edu - group communication security.
* Theo Schlossnagle jesus@omniti.com - Perl, skiplists, autoconf.
* Dan Schoenblum dansch@cnds.jhu.edu - Java interface.
* John Schultz jschultz@cnds.jhu.edu - contribution to process group membership.
*
*/
/*
* simple_user.c
*
* This simple program demonstrates how to use the Spread library.
*
*/
#include "sp.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static char User[80];
static char Spread_name[80];
static char Private_group[MAX_GROUP_NAME];
static mailbox Mbox;
static int Read_message();
static void Usage( int argc, char *argv[] );
int main( int argc, char *argv[] )
{
int ret;
int mess_len;
char mess[200];
Usage( argc, argv );
/* connecting to the daemon, requesting group information */
ret = SP_connect( Spread_name, User, 0, 1, &Mbox, Private_group );
if( ret < 0 )
{
SP_error( ret );
exit(0);
}
/* joining a group */
SP_join( Mbox, "simple_group" );
printf("enter message: ");
ret = (int) fgets( mess, 200, stdin );
if( ret==0 ) exit(0);
mess_len = strlen(mess);
/* multicast a message to that group */
ret = SP_multicast( Mbox, AGREED_MESS, "simple_group", 1, mess_len, mess );
/*
* reading a message.
* Note that the first message will be the membreship caused by
* the join (if group information was requested at connect time).
* If that was the case, we read another message.
*/
do{
ret = Read_message();
} while( !Is_regular_mess( ret ) );
return 0;
}
static int Read_message()
{
static char mess[102400];
char sender[MAX_GROUP_NAME];
char target_groups[100][MAX_GROUP_NAME];
group_id *grp_id;
int num_groups;
int num_bytes;
int service_type;
int16 mess_type;
int endian_mismatch;
int i;
int ret;
printf("\n============================\n");
service_type = 0;
ret = SP_receive( Mbox, &service_type, sender, 100, &num_groups, target_groups,
&mess_type, &endian_mismatch, sizeof(mess), mess );
if( ret < 0 )
{
SP_error( ret );
exit(0);
}
if( Is_regular_mess( service_type ) )
{
/* A regular message, sent by one of the processes */
mess[ret] = 0;
if ( Is_unreliable_mess( service_type ) ) printf("received UNRELIABLE ");
else if( Is_reliable_mess( service_type ) ) printf("received RELIABLE ");
else if( Is_fifo_mess( service_type ) ) printf("received FIFO ");
else if( Is_causal_mess( service_type ) ) printf("received CAUSAL ");
else if( Is_agreed_mess( service_type ) ) printf("received AGREED ");
else if( Is_safe_mess( service_type ) ) printf("received SAFE ");
printf("message from %s of type %d (endian %d), to %d groups \n(%d bytes): %s\n",
sender, mess_type, endian_mismatch, num_groups, ret, mess );
}else if( Is_membership_mess( service_type ) ){
/* A membership notification */
if ( Is_reg_memb_mess( service_type ) )
{
num_bytes = 0;
grp_id = (group_id *)&mess[num_bytes];
num_bytes += sizeof( group_id );
printf("received REGULAR membership ");
if( Is_caused_join_mess( service_type ) ) printf("caused by JOIN ");
if( Is_caused_leave_mess( service_type ) ) printf("caused by LEAVE ");
if( Is_caused_disconnect_mess( service_type ) ) printf("caused by DISCONNECT ");
printf("for group %s with %d members:\n",
sender, num_groups );
for( i=0; i < num_groups; i++ )
printf("\t%s\n", &target_groups[i][0] );
printf("grp id is %d %d %d\n",grp_id->id[0], grp_id->id[1], grp_id->id[2] );
}else if( Is_transition_mess( service_type ) ) {
printf("received TRANSITIONAL membership for group %s\n", sender );
}else if( Is_caused_leave_mess( service_type ) ){
printf("received membership message that left group %s\n", sender );
}else printf("received incorrect membership message of type %d\n", service_type );
}else printf("received message of unknown message type %d with %d bytes\n", service_type, ret);
return( service_type );
}
static void Usage(int argc, char *argv[])
{
/* Setting defaults */
sprintf( User, "simple" );
sprintf( Spread_name, "3333");
while( --argc > 0 )
{
argv++;
if( !strncmp( *argv, "-u", 2 ) )
{
strcpy( User, argv[1] );
argc--; argv++;
}else if( !strncmp( *argv, "-s", 2 ) ){
strcpy( Spread_name, argv[1] );
argc--; argv++;
}else{
printf( "Usage: user\n%s\n%s\n",
"\t[-u <user name>] : unique (in this machine) user name",
"\t[-s <address>] : either port or port@machine");
exit(1);
}
}
}
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