server.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

/* server */
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <string.h>

#define	KEY_MSG		0x101
#define	MSGSIZE		128

int main()
{
	int	msgid;
	struct	msgbuf
	{
		long	mtype;
		int	subtype;
		char 	mtext[MSGSIZE];
	}buf;
	
	/* create a message queue */
	msgid = msgget( KEY_MSG, IPC_CREAT|0666 );

	/* unlimit loop, when meet a exit flag, break */
	while( 1 )
	{
		msgrcv( msgid, &buf, MSGSIZE+4, 1L, 0 );			/* receive message from client1 */
		printf( "Receive client message: %s\n", buf.mtext );
		
		if( buf.mtext[0] == 'x' || buf.mtext[0] == 'X' )
                {
                        strcpy( buf.mtext, "x" );
                        buf.mtype = 2L;
                        msgsnd( msgid, &buf, MSGSIZE+4, 0 );             /* send quit message to client1 */

                        buf.mtype = 3L;
                        msgsnd( msgid, &buf, MSGSIZE+4, 0 );             /* send quit message to client2 */

                        break;
                }

		
		if( buf.subtype == 2 )
		{
			buf.mtype = 3L;
			msgsnd( msgid, &buf, MSGSIZE+4, 0);
		}	
		else
		{
			buf.mtype = 2L;
                        msgsnd( msgid, &buf, MSGSIZE+4, 0);
		}
	}
	
	sleep(5);		/* if quit, wait first, make sure that both client quit */
	msgctl( msgid, IPC_RMID, NULL );	
	exit(0);	
}