ctl.c

让你了解Unix进程间的通信是如何实现的

#include	"unpipc.h"

int
main(int argc, char **argv)
{
	int				msqid;
	struct msqid_ds	info;
	struct msgbuf	buf;

	msqid = Msgget(IPC_PRIVATE, SVMSG_MODE | IPC_CREAT);

	buf.mtype = 1;
	buf.mtext[0] = 1;
	Msgsnd(msqid, &buf, 1, 0);

	Msgctl(msqid, IPC_STAT, &info);
	printf("read-write: %03o, cbytes = %lu, qnum = %lu, qbytes = %lu\n",
		   info.msg_perm.mode & 0777, (ulong_t) info.msg_cbytes,
		   (ulong_t) info.msg_qnum, (ulong_t) info.msg_qbytes);

	system("ipcs -q");

	Msgctl(msqid, IPC_RMID, NULL);
	exit(0);
}