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<HTML
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>connect</TITLE
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TITLE="TCP/IP Library Reference"
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>eCos Reference Manual</TH
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>Chapter 38. TCP/IP Library Reference</TD
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NAME="NET-COMMON-TCPIP-MANPAGES-CONNECT">connect</H1
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><PRE
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CLASS="SCREEN"
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>CONNECT(2) System Calls Manual CONNECT(2)
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NAME
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connect - initiate a connection on a socket
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SYNOPSIS
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#include <sys/types.h>
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#include <sys/socket.h>
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int
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connect(int s, const struct sockaddr *name, socklen_t namelen);
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DESCRIPTION
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The parameter s is a socket. If it is of type SOCK_DGRAM, this call
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specifies the peer with which the socket is to be associated; this
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address is that to which datagrams are to be sent, and the only address
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from which datagrams are to be received. If the socket is of type
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SOCK_STREAM, this call attempts to make a connection to another socket.
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The other socket is specified by name, which is an address in the commu-
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nications space of the socket. Each communications space interprets the
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name parameter in its own way. Generally, stream sockets may success-
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fully connect() only once; datagram sockets may use connect() multiple
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times to change their association. Datagram sockets may dissolve the
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association by connecting to an invalid address, such as a null address.
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RETURN VALUES
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If the connection or binding succeeds, 0 is returned. Otherwise a -1 is
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returned, and a more specific error code is stored in errno.
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ERRORS
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The connect() call fails if:
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[EBADF] S is not a valid descriptor.
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[ENOTSOCK] S is a descriptor for a file, not a socket.
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[EADDRNOTAVAIL] The specified address is not available on this
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machine.
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[EAFNOSUPPORT] Addresses in the specified address family cannot be
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used with this socket.
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[EISCONN] The socket is already connected.
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[ETIMEDOUT] Connection establishment timed out without establish-
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ing a connection.
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[EINVAL] A TCP connection with a local broadcast, the all-ones
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or a multicast address as the peer was attempted.
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[ECONNREFUSED] The attempt to connect was forcefully rejected.
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[EINTR] A connect was interrupted before it succeeded by the
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delivery of a signal.
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[ENETUNREACH] The network isn't reachable from this host.
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[EADDRINUSE] The address is already in use.
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[EFAULT] The name parameter specifies an area outside the pro-
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cess address space.
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[EINPROGRESS] The socket is non-blocking and the connection cannot
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be completed immediately. It is possible to select(2)
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or poll(2) for completion by selecting the socket for
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writing, and also use getsockopt(2) with SO_ERROR to
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check for error conditions.
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[EALREADY] The socket is non-blocking and a previous connection
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attempt has not yet been completed.
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The following errors are specific to connecting names in the UNIX domain.
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These errors may not apply in future versions of the UNIX IPC domain.
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[ENOTDIR] A component of the path prefix is not a directory.
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[ENAMETOOLONG] A component of a pathname exceeded {NAME_MAX} charac-
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ters, or an entire path name exceeded {PATH_MAX} char-
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acters.
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[ENOENT] The named socket does not exist.
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[EACCES] Search permission is denied for a component of the
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path prefix.
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[EACCES] Write access to the named socket is denied.
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[ELOOP] Too many symbolic links were encountered in translat-
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ing the pathname.
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SEE ALSO
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accept(2), getsockname(2), getsockopt(2), poll(2), select(2), socket(2)
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HISTORY
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The connect() function call appeared in 4.2BSD.
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BSD February 15, 1999 BSD
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</PRE
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