BIND(3P)                                            POSIX Programmer's Manual                                           BIND(3P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult the corresponding Linux manual page for details of Linux behavior), or the  interface  may  not  be  implemented  on
       Linux.

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
       The  bind()  function shall assign a local socket address address to a socket identified by descriptor socket that has no
       local socket address assigned. Sockets created with the socket() function are initially unnamed; they are identified only
       by their address family.

       The bind() function takes the following arguments:

       socket Specifies the file descriptor of the socket to be bound.

       address
              Points  to  a  sockaddr  structure  containing the address to be bound to the socket. The length and format of the
              address depend on the address family of the socket.

       address_len
              Specifies the length of the sockaddr structure pointed to by the address argument.


       The socket specified by socket may require the process to have appropriate privileges to use the bind() function.

RETURN VALUE
       Upon successful completion, bind() shall return 0; otherwise, -1 shall be returned and errno set to indicate the error.

ERRORS
       The bind() function shall fail if:

       EADDRINUSE
              The specified address is already in use.

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

       EAFNOSUPPORT
              The specified address is not a valid address for the address family of the specified socket.

       EBADF  The socket argument is not a valid file descriptor.

       EINVAL The socket is already bound to an address, and the protocol does not support binding to  a  new  address;  or  the
              socket has been shut down.

       ENOTSOCK
              The socket argument does not refer to a socket.

       EOPNOTSUPP
              The socket type of the specified socket does not support binding to an address.


       If the address family of the socket is AF_UNIX, then bind() shall fail if:

       EACCES A  component  of  the  path prefix denies search permission, or the requested name requires writing in a directory
              with a mode that denies write permission.

       EDESTADDRREQ or EISDIR
              The address argument is a null pointer.

       EIO    An I/O error occurred.

       ELOOP  A loop exists in symbolic links encountered during resolution of the pathname in address.

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

       ENOENT A component of the pathname does not name an existing file or the pathname is an empty string.

       ENOTDIR
              A component of the path prefix of the pathname in address is not a directory.

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


       The bind() function may fail if:

       EACCES The specified address is protected and the current user does not have permission to bind to it.

       EINVAL The address_len argument is not a valid length for the address family.

       EISCONN
              The socket is already connected.

       ELOOP  More than {SYMLOOP_MAX} symbolic links were encountered during resolution of the pathname in address.

       ENAMETOOLONG
              Pathname resolution of a symbolic link produced an intermediate result whose length exceeds {PATH_MAX}.

       ENOBUFS
              Insufficient resources were available to complete the call.


       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       An application program can retrieve the assigned socket name with the getsockname() function.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       connect(), getsockname(), listen(), socket(), the Base Definitions volume of IEEE Std 1003.1-2001, <sys/socket.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003  Edition,  Standard  for
       Information  Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copy-
       right (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any
       discrepancy  between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group
       Standard  is  the  referee   document.   The   original   Standard   can   be   obtained   online   at   http://www.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                      BIND(3P)