IP_MTU2const
Path maximum transmission unit size
Usage
#include <netinet/in.h> /* Definition of IP* constants */ #include <sys/socket.h>
int getsockopt(int sockfd, IPPROTO_IP, IP_MTU, int *val, sizeof(int));
Library
Standard C library (libc, -lc)
Overview
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).