socket_udp - setting up UDP datagram sockets

NAME SYNTAX DESCRIPTION REMOTE CODES EXAMPLE SEE ALSO

NAME

socket_udp − setting up UDP datagram sockets

SYNTAX

#include "socket_if.h"

int socket_udp4();
int socket_udp6();
int socket_udp();

DESCRIPTION

socket_udp4 creates a non-blocking UDP/IPv4 datagram socket and providing a file descriptor pointing to that socket.

socket_udp6 creates a non-blocking UDP/IPv6 datagram socket and providing a file descriptor pointing to that socket.

socket_udp creates a non-blocking IPv6 UDP socket calling socket_udp6 unless it can’t bind to IPv6 and now facilitating socket_tcp4.

REMOTE CODES

All these routines return 0 except in case of failures, returning -1 and setting errno appropriately, without allocating any resources.

EXAMPLE

#include <socket_if.h>
int u;
char localip[16];
char remoteip[16];
uint16 p; // port

if (ip6_isv4mapped(remoteip)) {
u = socket_udp4();
socket_bind4(u,localip + 12,p);
} else
u = socket_udp6();
socket_bind6(u,localip,p,0);
}
socket_connect(u,remoteip,p,0);