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Linux系统调用

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<TITLE>Syscall specifications of Linux - connect</TITLE>
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<H2><A NAME="SEC43" HREF="syscalls_toc.html#SEC43" tppabs="http://personal.xfol.com/%7erezaie/syscall/syscalls_toc.html#SEC43">connect</A></H2>
<P>
<H3>SYNOPSIS</H3>
<P>
<CODE>int connect(int <VAR>sockfd</VAR>, struct sockaddr *<VAR>serv_addr</VAR>, int
       <VAR>addrlen</VAR>);</CODE>
<P>
<H3>PARAMETERS</H3>
<P>
<VAR>sockfd</VAR>: [in] the socket to connect.
<P>
<VAR>serv_addr</VAR>: [in] the remote address to connect to.
<P>
<VAR>addrlen</VAR>: [in] the lenght (in bytes) of <VAR>serv_addr</VAR>.
<P>
<H3>DESCRIPTION</H3>
<P>
If the socket is of type <CODE>SOCK_DGRAM</CODE>, it connects the socket
<VAR>sockfd</VAR> to a remote address specified by <VAR>serv_addr</VAR>. A
datagram socket can call <CODE>connect</CODE> multiple times to change the
remote address. If the socket is of type <CODE>SOCK_STREAM</CODE>, it connects
the socket to another socket. In that case, the format of
<VAR>serv_addr</VAR> depends on the communication space of the socket. A
stream socket may only call <CODE>connect</CODE> once.
<P>
<H3>RETURN VALUE</H3>
<P>
On success zero is returned. On error, -1 is returned and <CODE>errno</CODE> is
set to one of the following values:
<P>
<UL>
<LI><CODE>EINVAL</CODE>: the socket is in some kind of limbo state: neither
connected nor unconnected!!!
<LI><CODE>EBADF</CODE>, <CODE>ENOTSOCK</CODE>, <CODE>EISCONN</CODE>, <CODE>EALREADY</CODE>,
<CODE>EAGAIN</CODE>, <CODE>EOPNOTSUPP</CODE>, <CODE>EINPROGRESS</CODE>, <CODE>ERESTARTSYS</CODE>.
</UL>
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