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

NAME
     bind -- bind a name to a socket

SYNOPSIS
     #include <&lt;sys/socket.h>&gt;

     int
     bind(int s, const struct sockaddr *name, socklen_t namelen);

DESCRIPTION
     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 name be assigned to the socket.  namelen
     indicates the amount of space pointed to by name, in bytes.

NOTES
     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
     unlink(2)).

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

RETURN VALUES
     Upon successful completion, the value 0 is returned; otherwise the
     value -1 is returned and the global variable errno is set to indicate the
     error.

ERRORS
     The bind() function will fail if:

     [EBADF]            s is not a valid descriptor.

     [ENOTSOCK]         s is not a socket.

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

     [EADDRINUSE]       The specified address is already in use.

     [EINVAL]           The socket is already bound to an address, or namelen
                        is not a valid length for the supplied address.

     [EAFNOSUPPORT]     The family of the socket and that requested in
                        name-&gt;sa_family are not equivalent.

     [ENOBUFS]          Insufficient buffer space is available.

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

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

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

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

     [ENAMETOOLONG]     A component of a pathname exceeded NAME_MAX charac-
                        ters, or an entire pathname (including the terminating
                        NUL) exceeded PATH_MAX bytes.

     [ENOENT]           A prefix component of the path name does not exist.

     [ELOOP]            Too many symbolic links were encountered in translat-
                        ing the pathname.

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

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

     [EISDIR]           An empty pathname was specified.

SEE ALSO
     connect(2), getsockname(2), listen(2), socket(2)

STANDARDS
     The bind() function conforms to IEEE Std 1003.1-2008 (``POSIX.1'').

HISTORY
     The bind() system call first appeared in 4.1cBSD.

BSD                             March 28, 2017                             BSD