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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)):
fstatat():
Since glibc 2.10:
_XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
Before glibc 2.10:
_ATFILE_SOURCE
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:
AT_SYMLINK_NOFOLLOW
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.
ENOTDIR
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)
This page is part of release 3.32 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be found
at http://www.kernel.org/doc/man-pages/.
Linux 2010-11-21 FSTATAT(2)
HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface