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 */
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 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 in which case
the call operates 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 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
fstatat() was added to Linux in kernel 2.6.16; library support was added to glibc in ver-
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
openat(2), stat(2), path_resolution(7), symlink(7)
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Linux 2013-07-21 FSTATAT(2)