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       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 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

       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.

              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 additional 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.


       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)


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