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 .