Linux読み書きメッセージキュー

//リードメッセージキュー

#include
#include
#include
#include
#include
#include
#include
#include 
#include 
#include 		   
 struct msgbuf {
   long mtype;       /* message type, must be > 0 */
   char mtext[1024];    /* message data */
			};	
int main(int argc,char *argv[])
{
	int msgid;
	int ret = 0;
	
	int type;
	int len ;
	int flag = 0;
	
	if(argc == 1)
	{
		fprintf(stderr,"Usage:%s   
",argv[0]);
		exit(EXIT_FAILURE);
	}
	if(argc == 2)
	{
		type = atoi(argv[1]);
		flag = 0;
	}
	if(argc == 3)
	{
		int type = atoi(argv[1]);
		flag = flag |IPC_NOWAIT;
	}
	
	msgid = msgget(0X1234, 0666);
	if(msgid == -1)
	{
		if(errno == ENOENT)
		{
			printf("     
");
		}
		if(errno == EEXIST)
		{
			printf("        
");
		}
		perror("msgget err
");
		return -1;
	}
	printf("msgid:%d
",msgid);
	
	struct msgbuf buf;
	memset(&buf,0,sizeof(struct msgbuf));
	ret = msgrcv(msgid, &buf,1024, type,flag);
	
	if(ret <0)
	{
		perror("msgsnd err");
		return -1;
	}
	buf.mtext[ret] = '\0';
	printf("mtext:%s
",buf.mtext);
	
	return 0;
	
}

//書き込みキュー

#include
#include
#include
#include
#include
#include
#include
#include 
#include 
#include 		   
	
 struct msgbuf {
   long mtype;       /* message type, must be > 0 */
   char mtext[1024];    /* message data */
			};	

int main(int argc,char *argv[])
{
	int msgid;
	if(argc != 3)
	{
		fprintf(stderr,"Usage:%s   
",argv[0]);
		exit(EXIT_FAILURE);
	}
	int type = atoi(argv[1]);
	int len = atoi(argv[2]);
	
	msgid = msgget(0X1234, 0666 |IPC_CREAT |IPC_EXCL);

	//key_t key=ftok("./msgfile",'a');
    //printf("key =[%x]
",key);
	//msgid = msgget(key, 0666 |IPC_CREAT);

	if(msgid == -1)
	{
		if(errno == ENOENT)
		{
			printf("     
");
		}
		if(errno == EEXIST)
		{
			printf("        
");
		}
		perror("msgget err
");
		return -1;
	}
	printf("msgid:%d
",msgid);
	
	struct msgbuf buf;
	memset(&buf,0,sizeof(struct msgbuf));
	buf.mtype =type;
	stpcpy(buf.mtext,"11111111");
	
	
    int ret =  msgsnd(msgid, &buf,len, IPC_NOWAIT);
	if(ret <0)
	{
		perror("msgsnd err");
		return -1;
	}
 	
	printf("        ...
");
	
}