mesg_recv.c

让你了解Unix进程间的通信是如何实现的

/* include mesg_recv */
#include	"mesg.h"

ssize_t
mesg_recv(int id, struct mymesg *mptr)
{
	ssize_t	n;

	n = msgrcv(id, &(mptr->mesg_type), MAXMESGDATA, mptr->mesg_type, 0);
	mptr->mesg_len = n;		/* return #bytes of data */

	return(n);				/* -1 on error, 0 at EOF, else >0 */
}
/* end mesg_recv */

ssize_t
Mesg_recv(int id, struct mymesg *mptr)
{
	ssize_t	n;

	if ( (n = mesg_recv(id, mptr)) == -1)
		err_sys("mesg_recv error");
	return(n);
}