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llcloop(ADMP)


llcloop -- software loopback network interface

Syntax

Programmer's interface:
#include  <sys/socket.h>
#include  <netinet/in.h>
struct sockaddr_in sin;

s = socket(AF_INET, SOCK_xxx, 0); . . . sin.sin_addr.s_addr = htonl(INADDR_ANY); bind(s, (char *)&sin, sizeof(sin));

Description

The llcloop interface is a software loopback mechanism which may be used for performance analysis, software testing, and/or local communication. The loopback driver supports only the Internet address family.

The loopback interface is known to the system as ``lo0''.

By default, the loopback interface is accessible at Internet address 127.0.0.1 (INADDR_LOOPBACK). This address is official and should not normally be changed.

The kernel installs routes that cause locally-generated traffic destined for other local addresses to be sent via the loopback interface. This is a performance optimization.

The loopback interface should be the first interface configured, otherwise nameserver lookups for hostnames of other interfaces may fail.

The string ``xxx'' in the parameter SOCK_xxx should be ``STREAM'' when using TCP, ``DGRAM'' when using UDP, and ``RAW'' when using IP.

Files

/dev/llcloop

See also

Intro(ADMP), inet(ADMP)

RFC 1340


© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003