BIND(3P)

PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult 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, Copyright (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.opengroup.org/unix/online.html .