sock_cmp_addr.c

来自「《unix网络编程第二卷》中的源代码」· C语言 代码 · 共 44 行

#include	"unp.h"

#ifdef	HAVE_SOCKADDR_DL_STRUCT
# include	<net/if_dl.h>
#endif

int
sock_cmp_addr(const struct sockaddr *sa1, const struct sockaddr *sa2,
			 socklen_t salen)
{
	if (sa1->sa_family != sa2->sa_family)
		return(-1);

	switch (sa1->sa_family) {
	case AF_INET: {
		return(memcmp( &((struct sockaddr_in *) sa1)->sin_addr,
					   &((struct sockaddr_in *) sa2)->sin_addr,
					   sizeof(struct in_addr)));
	}

#ifdef	IPV6
	case AF_INET6: {
		return(memcmp( &((struct sockaddr_in6 *) sa1)->sin6_addr,
					   &((struct sockaddr_in6 *) sa2)->sin6_addr,
					   sizeof(struct in6_addr)));
	}
#endif

#ifdef	AF_UNIX
	case AF_UNIX: {
		return(strcmp( ((struct sockaddr_un *) sa1)->sun_path,
					   ((struct sockaddr_un *) sa2)->sun_path));
	}
#endif

#ifdef	HAVE_SOCKADDR_DL_STRUCT
	case AF_LINK: {
		return(-1);		/* no idea what to compare here ? */
	}
#endif
	}
    return (-1);
}