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fstatat - get file status relative to a directory file descriptor
#include <fcntl.h> /* Definition of AT_* constants */
int fstatat(int dirfd, const char *pathname, struct stat *buf,
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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