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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: _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:
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().
openat(2), stat(2), path_resolution(7), symlink(7)
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