NAME

IP_MTU - path maximum transmission unit size

LIBRARY

Standard C library (libc, -lc)

SYNOPSIS

#include <netinet/in.h>  /* Definition of IP* constants */
#include <sys/socket.h>

int getsockopt(int sockfd, IPPROTO_IP, IP_MTU,
               int *val, sizeof(int));

DESCRIPTION

Retrieve the current known path MTU of the current socket.

IP_MTU is valid only for getsockopt(2), and can be employed only when the socket has been connected.

ERRORS

See IPPROTO_IP(2const). See getsockopt(2). See ip(7).

STANDARDS

Linux.

HISTORY

Linux 2.2.

SEE ALSO

IPPROTO_IP(2const), getsockopt(2), ip(7)