.TH socket_send6 3
.SH NAME
socket_send6 \- send a UDP datagram
.SH SYNTAX
.B #include <libowfat/socket.h>

ssize_t \fBsocket_send6\fP(int \fIs\fR, const char* \fIbuf\fR, size_t \fIlen\fR,
                     const char \fIip\fR[16], uint16 \fIport\fR, uint32 \fIscope_id\fR);
.SH DESCRIPTION
socket_send6 sends \fIlen\fR bytes starting at \fIbuf\fR in a UDP
datagram over the socket \fIs\fR to UDP port \fIport\fR on IP address
\fIip\fR.

You can call socket_send6 without calling socket_bind6.  This has the
effect as first calling socket_bind6 with IP address :: and port 0.

The meaning of \fIscope_id\fR is dependent on the implementation and
IPv6 IP.  On link-local IPv6 addresses it specifies the outgoing
interface index.  The name (e.g. "eth0") for a given interface index can
be queried with getifname.  \fIscope_id\fR should normally be set to 0.
.SH RETURN VALUE
socket_send6 returns 0 if the datagram was sent successfully.  If not,
it returns -1 and sets errno appropriately.
.SH EXAMPLE
  #include <libowfat/socket.h>

  int \fIs\fR;
  char \fIip\fR[16];
  uint16 \fIp\fR;
  uint32 \fIscope_id\fR;

  \fIs\fR = socket_tcp4();
  socket_bind6(s,ip,p);
  socket_send6(s,"hello, world",12,ip,p,scope_id);

.SH "SEE ALSO"
socket_send4(3), socket_getifidx(3)