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BIND(2)			    BSD System Calls Manual		       BIND(2)

     bindbind a name to a socket

     #include <sys/socket.h>

     bind(int socket, const struct sockaddr *address, socklen_t address_len);

     Bind() assigns a name to an unnamed socket.  When a socket is created
     with socket(2) it exists in a name space (address family) but has no name
     assigned.	Bind() requests that address be assigned to the socket.

     Binding a name in the UNIX domain creates a socket in the file system
     that must be deleted by the caller when it is no longer needed (using

     The rules used in name binding vary between communication domains.	 Con‐
     sult the manual entries in section 4 for detailed information.

     Upon successful completion, a value of 0 is returned.  Otherwise, a value
     of -1 is returned and the global integer variable errno is set to indi‐
     cate the error.

     The bind() system call will fail if:

     [EACCES]		The requested address is protected, and the current
			user has inadequate permission to access it.

     [EADDRINUSE]	The specified address is already in use.

     [EADDRNOTAVAIL]	The specified address is not available from the local

     [EAFNOSUPPORT]	address is not valid for the address family of socket.

     [EBADF]		socket is not a valid file descriptor.

     [EDESTADDRREQ]	socket is a null pointer.

     [EFAULT]		The address parameter is not in a valid part of the
			user address space.

     [EINVAL]		socket is already bound to an address and the protocol
			does not support binding to a new address.  Alterna‐
			tively, socket may have been shut down.

     [ENOTSOCK]		socket does not refer to a socket.

     [EOPNOTSUPP]	socket is not of a type that can be bound to an

     The following errors are specific to binding names in the UNIX domain.

     [EACCES]		A component of the path prefix does not allow search‐
			ing or the node's parent directory denies write per‐

     [EIO]		An I/O error occurred while making the directory entry
			or allocating the inode.

     [EISDIR]		An empty pathname was specified.

     [ELOOP]		Too many symbolic links were encountered in translat‐
			ing the pathname.  This is taken to be indicative of a
			looping symbolic link.

     [ENAMETOOLONG]	A component of a pathname exceeded {NAME_MAX} charac‐
			ters, or an entire path name exceeded {PATH_MAX} char‐

     [ENOENT]		A component of the path name does not refer to an
			existing file.

     [ENOTDIR]		A component of the path prefix is not a directory.

     [EROFS]		The name would reside on a read-only file system.

     #include <sys/types.h>
     #include <sys/socket.h>

     The include file <sys/types.h> is necessary.

     connect(2), getsockname(2), listen(2), socket(2), compat(5)

     The bind() function call appeared in 4.2BSD.

4.2 Berkeley Distribution	 June 4, 1993	     4.2 Berkeley Distribution

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