NAME

       bind — assign a local protocol address to a socket

LIBRARY

       Standard C Library (libc, -lc)

SYNOPSIS

       #include <sys/socket.h>

       int
       bind(int s, const struct sockaddr *addr, socklen_t addrlen);

DESCRIPTION

       The  bind()  system  call  assigns the local protocol address to a socket.  When a socket is created with
       socket(2) it exists in an address family space but has no protocol address assigned.  The  bind()  system
       call requests that addr be assigned to the socket.

NOTES

       Binding  an  address  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 unlink(2)).

       The rules used in address binding vary between communication domains.   Consult  the  manual  entries  in
       section 4 for detailed information.

       For  maximum  portability,  you  should always zero the socket address structure before populating it and
       passing it to bind().

RETURN VALUES

       The bind() function returns the value 0 if successful; otherwise the value -1 is returned and the  global
       variable errno is set to indicate the error.

ERRORS

       The bind() system call will fail if:

       [EAGAIN]           Kernel resources to complete the request are temporarily unavailable.

       [EBADF]            The s argument is not a valid 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.

       [EINVAL]           The addrlen argument is not a valid length for the address family.

       [ENOTSOCK]         The s argument is not a socket.

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

       [EADDRINUSE]       The specified address is already in use.

       [EAFNOSUPPORT]     Addresses in the specified address family cannot be used with this socket.

       [EACCES]           The requested address is protected, and the current user has inadequate permission  to
                          access it.

       [EFAULT]           The addr argument is not in a valid part of the user address space.

       The following errors are specific to binding addresses in the UNIX domain.

       [ENOTDIR]    A component of the path prefix is not a directory.

       [ENAMETOOLONG]
                    A  component  of  a  pathname  exceeded 255 characters, or an entire path name exceeded 1023
                    characters.

       [ENOENT]     A prefix component of the path name does not exist.

       [ELOOP]      Too many symbolic links were encountered in translating the pathname.

       [EIO]        An I/O error occurred while making the directory entry or allocating the inode.

       [EINTEGRITY]
                    Corrupted data was detected while reading from the file system.

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

       [EISDIR]     An empty pathname was specified.

SEE ALSO

       connect(2), getsockname(2), listen(2), socket(2)

HISTORY

       The bind() system call appeared in 4.2BSD.

Debian                                           March 30, 2020                                          BIND(2)