IP_RETOPTS2const
Receive most incoming ip options in control message
Usage
#include <netinet/in.h> /* Definition of IP* constants */ #include <sys/socket.h>
int setsockopt(int sockfd, IPPROTO_IP, IP_RETOPTS, const int *enabled, sizeof(int));
Library
Standard C library (libc, -lc)
Overview
Identical to IP_RECVOPTS(2const), but returns raw unprocessed options with timestamp and route record options not filled in for this hop.
Not supported for SOCK_STREAM sockets.
Errors
See IPPROTO_IP(2const). See setsockopt(2). See ip(7).