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CONNECTAT(2) FreeBSD System Calls Manual CONNECTAT(2)

initiate a connection on a socket

Standard C Library (libc, -lc)

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

#include <fcntl.h>

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

The connectat() system call initiates a connection on the socket s. When passed the special value AT_FDCWD in the fd parameter, the behavior is identical to a call to connect(2). Otherwise, connectat() works 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.

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 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 <> under sponsorship from the FreeBSD Foundation.
February 13, 2013 FreeBSD 13.1-RELEASE

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