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FreeBSD 11.0 - man page for bindat (freebsd section 2)

BINDAT(2)						      BSD System Calls Manual							 BINDAT(2)

NAME
bindat -- assign a local protocol address to a socket
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/types.h> #include <sys/socket.h> #include <fcntl.h> int bindat(int fd, int s, const struct sockaddr *addr, socklen_t addrlen);
DESCRIPTION
The bindat() system call assigns the local protocol address to a socket. It works just 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. If bindat() is passed the special value AT_FDCWD in the fd parameter, the cur- rent working directory is used and the behavior is identical to a call to bind(2).
RETURN VALUES
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.
ERRORS
The bindat() system call may fail with the same errors as the bind(2) system call for a UNIX domain socket 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.
SEE ALSO
bind(2), connectat(2), socket(2), unix(4)
AUTHORS
The bindat was developed by Pawel Jakub Dawidek <pawel@dawidek.net> under sponsorship from the FreeBSD Foundation.
BSD
February 13, 2013 BSD