fstatat

Sommaire

NAME

fstatat - get file status relative to a directory file descriptor

SYNOPSIS

#define _ATFILE_SOURCE
#include <sys/stat.h>
int fstatat(int dirfd, const char *pathname, struct stat *buf, int flags);

DESCRIPTION

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).)

RETURN VALUE

On success, fstatat() returns 0. On error, -1 is returned and errno is set to indicate the error.

ERRORS

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.

NOTES

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

CONFORMING TO

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.

VERSIONS

fstatat() was added to Linux in kernel 2.6.16.

SEE ALSO

openat(2), path_resolution(2), stat(2)