client1.c

源码包中是我在学习Linux进程间通信时所写的关于五种通信方式（管道

/* client1 */

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>

#define KEY_MSG         0x101
#define MSGSIZE         128

int main()
{	
	int     msgid;
        struct  msgbuf
        {
                long    mtype;
		int	subtype;
                char    mtext[MSGSIZE];
        }bufin, bufout;

	msgid = msgget( KEY_MSG, 0666 );		/* open message queue created by server */

	if( fork() == 0 )
	{
		printf( "send message to client2 :" );
		while(1)
		{
			fgets( bufout.mtext, MSGSIZE, stdin );
			bufout.mtype = 1L;	
			bufout.subtype = 2;
			msgsnd( msgid, &bufout, MSGSIZE+4, 0 );
		}
	}

	else
	{
		while(1)
		{
			msgrcv( msgid, &bufin, MSGSIZE+4, 2L, 0 );

			if( bufin.mtext[0] == 'x' || bufin.mtext[0] == 'X' )
                	{
				kill( fork(), SIGINT );
                        	break;
                	}
			printf("receive message from client2 :%s", bufin.mtext );
		}
	}
}