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Linux 2.6 - man page for fstatat (linux section 2)

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

       fstatat - get file status relative to a directory file descriptor

       #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)):

	   Since glibc 2.10:
	       _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
	   Before glibc 2.10:

       The fstatat() system call operates in exactly the same way as stat(2), except for the dif-
       ferences 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  inter-
       preted 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 direc-
	      tory 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 auto-
	      mount  points.   The  AT_NO_AUTOMOUNT  flag  has	no  effect if the mount point has
	      already been mounted over.

	      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).)

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

       The  same errors that occur for stat(2) can also occur for fstatat().  The following addi-
       tional errors can occur for fstatat():

       EBADF  dirfd is not a valid file descriptor.

       EINVAL Invalid flag specified in flags.

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

       fstatat()  was added to Linux in kernel 2.6.16; library support was added to glibc in ver-
       sion 2.4.

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

       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().

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

       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

Linux					    2013-07-21				       FSTATAT(2)

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