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CONNECTAT(2) System Calls Manual CONNECTAT(2)

connectat — initiate a connection on a socket

library “libc”

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


#include <fcntl.h>

int
connectat(int fd, int s, const struct sockaddr *name, socklen_t namelen);

The () system call initiates a connection on a socket. It works just like the connect(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 () 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 connect(2).

The connectat() 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 connectat() system call may fail with the same errors as the connect(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.

bindat(2), connect(2), socket(2), unix(4)

The connectat was developed by Pawel Jakub Dawidek <pawel@dawidek.net> under sponsorship from the FreeBSD Foundation.

February 13, 2013 FreeBSD-11.1