8 #include <sys/socket.h>
10 int udpfromto_init(int s);
11 int recvfromto(int s, void *buf, size_t len, int flags,
12 struct sockaddr *from, socklen_t *fromlen,
13 struct sockaddr *to, socklen_t *tolen);
14 int sendfromto(int s, void *buf, size_t len, int flags,
15 struct sockaddr *from, socklen_t fromlen,
16 struct sockaddr *to, socklen_t tolen);