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.
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 .