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     bindat — assign a local protocol address to a socket


     Standard C Library (libc, -lc)


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

     #include <fcntl.h>

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


     The bindat() system call assigns the local protocol address to a socket.  When passed the
     special value AT_FDCWD in the fd parameter, the behavior is identical to a call to bind(2).
     Otherwise, bindat() works like the bind(2) system call with two exceptions:

           1.   It is limited to sockets in the PF_LOCAL domain.

           2.   If the file path stored in the sun_path field of the sockaddr_un structure is a
                relative path, it is located relative to the directory associated with the file
                descriptor fd.


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


     The bindat() system call may fail with the same errors as the bind(2) system call or with
     the following errors:

     [EBADF]            The sun_path field does not specify an absolute path and the fd argument
                        is neither AT_FDCWD nor a valid file descriptor.

     [ENOTDIR]          The sun_path field is not an absolute path and fd is neither AT_FDCWD nor
                        a file descriptor associated with a directory.


     bind(2), connectat(2), socket(2), unix(4)


     The bindat was developed by Pawel Jakub Dawidek <> under sponsorship from
     the FreeBSD Foundation.