bind - bind a name to a socket
bind(int s, caddr_tr name, int namelen);
bind() assigns a name to an unnamed socket. When a socket is created
with socket(3N), it exists in a name space (address family) but has no
name assigned. bind() requests that the name pointed to by name be
assigned to the socket.
If the bind is successful, a 0 value is returned. A return value of -1
indicates an error, which is further specified in the global errno.
The bind() call will fail if:
EBADF s is not a valid descriptor.
ENOTSOCK s is a descriptor for a file, not a socket.
EADDRNOTAVAIL The specified address is not available on the local
EADDRINUSE The specified address is already in use.
EINVAL namelen is not the size of a valid address for the
specified address family.
EINVAL The socket is already bound to an address.
EACCES The requested address is protected and the current
user has inadequate permission to access it.
ENOSR There were insufficient STREAMS resources for the
operation to complete.
The following errors are specific to binding names in the UNIX domain:
ENOTDIR A component of the path prefix of the pathname in
name is not a directory.
ENOENT A component of the path prefix of the pathname in
name does not exist.
EACCES Search permission is denied for a component of the
path prefix of the pathname in name.
ELOOP Too many symbolic links were encountered in
translating the pathname in name.
EIO An I/O error occurred while making the directory
entry or allocating the inode.
EROFS The inode would reside on a read-only file system.
EISDIR A null pathname was specified.
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
The rules used in name binding vary between communication domains.
The type of address structure passed to bind() depends on the address
family. UNIX domain sockets (address family AF_UNIX) require a struct
socketaddr_un as defined in sys/un.h; Internet domain sockets (address
family AF_INET) require a struct sockaddr_in as defined in netinet/in.h.
Other address families may require other structures. Use the structure
appropriate to the address family; cast the structure address to a
generic caddr_t in the call to bind() and pass the size of the structure
in the length argument.
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