centos man page for fstatat

FSTATAT(2)						     Linux Programmer's Manual							FSTATAT(2)

NAME
       fstatat - get file status relative to a directory file descriptor

SYNOPSIS
       #include <fcntl.h> /* Definition of AT_* constants */
       #include <sys/stat.h>

       int fstatat(int dirfd, const char *pathname, struct stat *buf,
		   int flags);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       fstatat():
	   Since glibc 2.10:
	       _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
	   Before glibc 2.10:
	       _ATFILE_SOURCE

DESCRIPTION
       The fstatat() system call operates in exactly the same way as stat(2), except for the differences described in this manual page.

       If  the	pathname  given in pathname is relative, then it is interpreted relative to the directory referred to by the file descriptor dirfd
       (rather than relative to the current working directory of the calling process, as is done by stat(2) for a relative pathname).

       If pathname is relative and dirfd is the special value AT_FDCWD, then pathname is interpreted relative to the current working directory	of
       the calling process (like stat(2)).

       If pathname is absolute, then dirfd is ignored.

       flags can either be 0, or include one or more of the following flags ORed:

       AT_EMPTY_PATH (since Linux 2.6.39)
	      If  pathname is an empty string, operate on the file referred to by in which case the call operates on the file referred to by dirfd
	      (which may have been obtained using the open(2) O_PATH flag).  In this case, dirfd can refer to any type of file, not just a  direc-
	      tory.

       AT_NO_AUTOMOUNT (since Linux 2.6.38)
	      Don't  automount	the  terminal ("basename") component of pathname if it is a directory that is an automount point.  This allows the
	      caller to gather attributes of an automount point (rather than the location it would mount).  This flag can be used  in  tools  that
	      scan  directories  to  prevent  mass-automounting of a directory of automount points.  The AT_NO_AUTOMOUNT flag has no effect if the
	      mount point has already been mounted over.

       AT_SYMLINK_NOFOLLOW
	      If pathname is a symbolic link, do not dereference it: instead return  information  about  the  link  itself,  like  lstat(2).   (By
	      default, fstatat() dereferences symbolic links, like stat(2).)

RETURN VALUE
       On success, fstatat() returns 0.  On error, -1 is returned and errno is set to indicate the error.

ERRORS
       The same errors that occur for stat(2) can also occur for fstatat().  The following additional errors can occur for fstatat():

       EBADF  dirfd is not a valid file descriptor.

       EINVAL Invalid flag specified in flags.

       ENOTDIR
	      pathname is relative and dirfd is a file descriptor referring to a file other than a directory.

VERSIONS
       fstatat() was added to Linux in kernel 2.6.16; library support was added to glibc in version 2.4.

CONFORMING TO
       POSIX.1-2008.  A similar system call exists on Solaris.

NOTES
       See openat(2) for an explanation of the need for fstatat().

       The underlying system call employed by the glibc fstatat() wrapper function is actually called fstatat64().

SEE ALSO
       openat(2), stat(2), path_resolution(7), symlink(7)

COLOPHON
       This  page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2013-07-21								FSTATAT(2)