sockfd_to_family.c

《unix网络编程第二卷》中的源代码

/* include sockfd_to_family */
#include	"unp.h"

int
sockfd_to_family(int sockfd)
{
	union {
	  struct sockaddr	sa;
	  char				data[MAXSOCKADDR];
	} un;
	socklen_t	len;

	len = MAXSOCKADDR;
	if (getsockname(sockfd, (SA *) un.data, &len) < 0)
		return(-1);
	return(un.sa.sa_family);
}
/* end sockfd_to_family */

int
Sockfd_to_family(int sockfd)
{
	int		rc;

	if ( (rc = sockfd_to_family(sockfd)) < 0)
		err_sys("sockfd_to_family error");

	return(rc);
}