CONNECTAT(2FREEBSD) - Linux man page online | System calls

Initiate a connection on a socket.

February 13, 2013
CONNECTAT(2) BSD System Calls Manual CONNECTAT(2)


connectat — initiate a connection on a socket


Standard C Library (libc, -lc)


#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 connectat() 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 connectat() 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: [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.


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


The connectat was developed by Pawel Jakub Dawidek <> under sponsorship from the FreeBSD Foundation.
BSD February 13, 2013 BSD
This manual Reference Other manuals
connectat(2freebsd) referred by bindat(2freebsd) | rights(4freebsd)
refer to bindat(2freebsd) | connect(2) | socket(2) | unix(4freebsd)
Download raw manual
Index BSD System Calls Manual (+360) BSD (+3984) № 2 (+877)
Go top