fstatat man page on Hurd

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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  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 directory.

       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 3.55 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)
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