.TH qlibs: socket_udp 3
.SH NAME
socket_udp \- setting up UDP datagram sockets
.SH SYNTAX
.B #include \(dqsocket_if.h\(dq

int \fBsocket_udp4\fP();
.br
int \fBsocket_udp6\fP();
.br
int \fBsocket_udp\fP();
.SH DESCRIPTION
.B socket_udp4 
creates a non-blocking UDP/IPv4 datagram socket and 
providing a file descriptor pointing to that socket.

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

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

.SH "REMOTE CODES"
All these routines return
.IR 0
except in case of failures, returning
.I -1 
and setting 
.I errno 
appropriately, without allocating any resources.
.SH EXAMPLE
  #include <socket_if.h>
  int \fIu\fR;
  char \fIlocalip\fR[16];
  char \fIremoteip\fR[16];
  uint16 \fIp\fR; // 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);
.SH "SEE ALSO"
socket_if(3), 
socket_bind(3), 
socket_connect(3), 
socket_info(3), 
socket_recv(3), 
socket_send(3), 
socket_setup(3), 
socket_tcp(3)