Command Section
BIND(2)                   FreeBSD System Calls Manual                  BIND(2)

     bind - assign a local protocol address to a socket

     Standard C Library (libc, -lc)

     #include <sys/types.h>
     #include <sys/socket.h>

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

     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.

     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

     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().

     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

     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

     [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

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

                  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

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

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

     [EISDIR]     An empty pathname was specified.

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

     The bind() system call appeared in 4.2BSD.

FreeBSD 11.1-RELEASE-p4          June 26, 2014         FreeBSD 11.1-RELEASE-p4
Command Section