tpi_bind.c

unix网络编程卷1：套接口API的全书源码

#include	"tpi_daytime.h"

void
tpi_bind(int fd, const void *addr, size_t addrlen)
{
	struct {
	  struct T_bind_req	msg_hdr;
	  char				addr[128];
	} bind_req;
	struct {
	  struct T_bind_ack	msg_hdr;
	  char				addr[128];
	} bind_ack;
	struct strbuf		ctlbuf;
	struct T_error_ack	*error_ack;
	int					flags;

	bind_req.msg_hdr.PRIM_type = T_BIND_REQ;
	bind_req.msg_hdr.ADDR_length = addrlen;
	bind_req.msg_hdr.ADDR_offset = sizeof(struct T_bind_req);
	bind_req.msg_hdr.CONIND_number = 0;
	memcpy(bind_req.addr, addr, addrlen);	/* sockaddr_in{} */

	ctlbuf.len = sizeof(struct T_bind_req) + addrlen;
	ctlbuf.buf = (char *) &bind_req;
	Putmsg(fd, &ctlbuf, NULL, 0);

	ctlbuf.maxlen = sizeof(bind_ack);
	ctlbuf.len = 0;
	ctlbuf.buf = (char *) &bind_ack;
	flags = RS_HIPRI;
	Getmsg(fd, &ctlbuf, NULL, &flags);

/* *INDENT-OFF* */
	if (ctlbuf.len < (int) sizeof(long))
		err_quit("bad length from getmsg");
/* *INDENT-ON* */

	switch(bind_ack.msg_hdr.PRIM_type) {
    case T_BIND_ACK:
		return;

    case T_ERROR_ACK:
/* *INDENT-OFF* */
		if (ctlbuf.len < (int) sizeof(struct T_error_ack))
			err_quit("bad length for T_ERROR_ACK");
		error_ack = (struct T_error_ack *) &bind_ack.msg_hdr;
		err_quit("T_ERROR_ACK from bind (%d, %d)",
				 error_ack->TLI_error, error_ack->UNIX_error);
/* *INDENT-ON* */

    default:
		err_quit("unexpected message type: %d", bind_ack.msg_hdr.PRIM_type);
	}
}