BIND(2)                       System Calls Manual                      BIND(2)

NAME
     bind – bind a name to a socket

SYNOPSIS
     #include <sys/socket.h>

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

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 address be assigned to the socket.

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.
     Consult the manual entries in section 4 for detailed information.

RETURN VALUES
     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
     indicate the error.

ERRORS
     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
                        machine.

     [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.
                        Alternatively, 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
                        address.

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

     [EACCES]           A component of the path prefix does not allow
                        searching or the node's parent directory denies write
                        permission.

     [EEXIST]           A file already exists at the pathname.  unlink(2) it
                        first.

     [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
                        translating the pathname.  This is taken to be
                        indicative of a looping symbolic link.

     [ENAMETOOLONG]     A component of a pathname exceeded {NAME_MAX}
                        characters, or an entire path name exceeded {PATH_MAX}
                        characters.

     [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.

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

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

SEE ALSO
     connect(2), connectx(2), getsockname(2), listen(2), socket(2), compat(5)

HISTORY
     The bind() function call appeared in 4.2BSD.

BSD 4.2                         March 18, 2015                         BSD 4.2