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.TH socket_connect4 3
.SH NAME
socket_connect4 \- attempt to make a TCP connection
.SH SYNTAX
.B #include <libowfat/socket.h>
int \fBsocket_connect4\fP(int \fIs\fR,const char \fIip\fR[4],uint16 \fIport\fR);
.SH DESCRIPTION
socket_connect4 attempts to make a connection from TCP socket \fIs\fR to
TCP port \fIport\fR on IP address \fIip\fR.
socket_connect4 may return
.sp 1
.IP \(bu
0, to indicate that the connection succeeded (and succeeded immediately,
if the socket is non-blocking)
.IP \(bu
-1, setting errno to error_inprogress or error_wouldblock, to indicate
that the socket is non-blocking
.IP \(bu
-1, setting errno to something else, to indicate that the connection
failed (and failed immediately, if the socket is non-blocking).
.PP
When a background connection succeeds or fails, \fIs\fR becomes
writable; you can use socket_connected to see whether the connection
succeeded. If the connection failed, socket_connected returns 0,
setting errno appropriately.
Once a TCP socket is connected, you can use the read and write
system calls to transmit data.
You can call socket_connect4 without calling socket_bind4. This has the
effect as first calling socket_bind4 with IP address 0.0.0.0 and port 0.
.SH EXAMPLE
#include <libowfat/socket.h>
int \fIs\fR;
char \fIip\fR[4];
uint16 \fIp\fR;
\fIs\fR = socket_tcp4();
socket_bind4(s,ip,p);
socket_connect4(s,ip,p);
.SH "SEE ALSO"
socket_connect6(3), socket_fastopen_connect4(3)
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