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.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)
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