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Manual Pages  — BINDAT


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. 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 current working directory is used and the behavior is identical to a call to bind(2).


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 for a UNIX domain socket or with the following errors:
  The sun_path field does not specify an absolute path and the fd argument is neither AT_FDCWD nor a valid file descriptor.
  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 <Mt pawel@dawidek.net> under sponsorship from the FreeBSD Foundation.

BINDAT (2) February 13, 2013

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