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

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 indi- cate 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.
February 13, 2013 BSD

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