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55 lines
1.8 KiB
Groff
55 lines
1.8 KiB
Groff
.TH socket_connect6 3
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.SH NAME
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socket_connect6 \- attempt to make a TCP connection
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.SH SYNTAX
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.B #include <libowfat/socket.h>
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int \fBsocket_connect6\fP(int \fIs\fR, const char \fIip\fR[16],
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uint16 \fIport\fR,uint32 \fIscope_id\fR);
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.SH DESCRIPTION
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socket_connect6 attempts to make a connection from TCP socket \fIs\fR to
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TCP port \fIport\fR on IP address \fIip\fR.
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The meaning of \fIscope_id\fR is dependent on the implementation and
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IPv6 IP. On link-local IPv6 addresses it specifies the outgoing
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interface index. The name (e.g. "eth0") for a given interface index can
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be queried with getifname. \fIscope_id\fR should normally be set to 0.
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socket_connect6 may return
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.sp 1
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.IP \(bu
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0, to indicate that the connection succeeded (and succeeded immediately,
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if the socket is non-blocking)
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.IP \(bu
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-1, setting errno to error_inprogress or error_wouldblock, to indicate
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that the socket is non-blocking
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.IP \(bu
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-1, setting errno to something else, to indicate that the connection
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failed (and failed immediately, if the socket is non-blocking).
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.PP
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When a background connection succeeds or fails, \fIs\fR becomes
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writable; you can use socket_connected to see whether the connection
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succeeded. If the connection failed, socket_connected returns 0,
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setting errno appropriately.
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Once a TCP socket is connected, you can use the read and write
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system calls to transmit data.
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You can call socket_connect6 without calling socket_bind6. This has the
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effect as first calling socket_bind6 with IP address :: and port 0.
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.SH EXAMPLE
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#include <libowfat/socket.h>
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int \fIs\fR;
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char \fIip\fR[16];
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uint16 \fIp\fR;
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\fIs\fR = socket_tcp6();
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socket_bind6(s,ip,p);
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socket_connect6(s,ip,p,0);
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.SH "SEE ALSO"
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socket_connect4(3), socket_fastopen_connect6(3), socket_getifname(3)
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