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-.\" Hey Emacs! This file is -*- nroff -*- source.
-.\"
-.\" This manpage is Copyright (C) 2006, Michael Kerrisk
-.\"
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-.\" manual provided the copyright notice and this permission notice are
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-.\" manual under the conditions for verbatim copying, provided that the
-.\" entire resulting derived work is distributed under the terms of a
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-.\" Since the Linux kernel and libraries are constantly changing, this
-.\" manual page may be incorrect or out-of-date. The author(s) assume no
-.\" responsibility for errors or omissions, or for damages resulting from
-.\" the use of the information contained herein. The author(s) may not
-.\" have taken the same level of care in the production of this manual,
-.\" which is licensed free of charge, as they might when working
-.\" professionally.
-.\"
-.\" Formatted or processed versions of this manual, if unaccompanied by
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-.\"
-.\"
-.TH OPENAT 2 2006-03-06 "Linux 2.6.16" "Linux Programmer's Manual"
-.SH NAME
-openat \- open a file at a relative location
-.SH SYNOPSIS
-.nf
-.B #include <sys/types.h>
-.B #include <sys/stat.h>
-.B #include <fcntl.h>
-.sp
-.BI "int openat(int " dirfd ", const char *" pathname ", int " flags );
-.BI "int openat(int " dirfd ", const char *" pathname ", int " flags \
-", mode_t " mode );
-.fi
-.SH DESCRIPTION
-The
-.BR openat ()
-system call operates in exactly the same way as
-.BR open (2),
-except for the differences described in this manual page.
-
-If the pathname given in
-.I pathname
-is relative, then it is interpreted relative to the directory
-referred to by the file descriptor
-.IR dirfd
-(rather than relative to the current working directory of
-the calling process, as is done by
-.BR open (2)
-for a relative pathname).
-
-If the pathname given in
-.I pathname
-is relative and
-.I dirfd
-is the special value
-.BR AT_FDCWD ,
-then pathname is interpreted relative to the current working
-directory of the calling process (like
-.BR open (2)).
-
-If the pathname given in
-.IR pathname
-is absolute, then
-.I dirfd
-is ignored.
-.SH "RETURN VALUE"
-.BR openat ()
-returns a new file descriptor, or \-1 if an error occurred
-(in which case,
-.I errno
-is set appropriately).
-.SH ERRORS
-The same errors that occur for
-.BR open (2)
-can also occur for
-.BR openat (2).
-The following additional errors can occur for
-.BR openat ():
-.TP
-.B EBADF
-.I dirfd
-is not a valid file descriptor.
-.TP
-.B ENOTDIR
-.I dirfd
-is a file descriptor referring to a file other than a directory.
-.SH NOTES
-The
-.BR openat ()
-system call (and similar system calls suffixed "at")
-provides functionality that can otherwise only be obtained
-less efficiently or at the risk of races in user applications.
-It allows the implementation of a per-thread "current working
-directory", via file descriptor(s) maintained by the application.
-(This functionality can also be obtained by tricks based
-on the use of
-.IR /proc/self/fd/ dirfd,
-but less efficiently.)
-It also allows the avoidance of various kinds of races that can occur
-as a result of directory deletions that may occur while an application
-is traversing a file system.
-.SH "CONFORMING TO"
-This system call is non-standard.
-A similar system call exists on Solaris.
-.\" The 'at' suffix in Solaris is actually double sensed. It
-.\" primarily referred to "extended *at*tributes", which are
-.\" handled by Solaris' O_XATTR flag, but was also intended
-.\" to refer to the notion of "at a relative location".
-.SH VERSIONS
-.BR openat ()
-was added to Linux in kernel 2.6.16.
-.SH "SEE ALSO"
-.BR open (2),
-.BR path_resolution (2)
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