IP_RECVTTL2const
Enable ip_ttl control message
Usage
#include <netinet/in.h> /* Definition of IP* constants */ #include <sys/socket.h>
int setsockopt(int sockfd, IPPROTO_IP, int opt, const int *enable, sizeof(int));
Library
Standard C library (libc, -lc)
Overview
When this flag is set, pass a IP_TTL(2const) control message with the time-to-live field of the received packet as a 32 bit integer.
Not supported for SOCK_STREAM sockets.
Errors
See IPPROTO_IP(2const). See setsockopt(2). See ip(7).
Versions
Some BSD sockets implementations also provide an IP_RECVTTL option, but an ancillary message with type IP_RECVTTL is passed with the incoming packet. This is different from the IP_TTL(2const) option used in Linux.