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       fstatat - get file status relative to a directory file descriptor


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

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


       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 the following flag:

              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.


       This system call is non-standard but is proposed  for  inclusion  in  a
       future revision of POSIX.1.  A similar system call exists on Solaris.


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


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


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