fchownat() - Unix, Linux System Call
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NAME
fchownat - change ownership of a file relative to a directory file descriptor
SYNOPSIS
#include <unistd.h>
int fchownat(int dirfd, const char *path,
uid_t owner, gid_t group, int flags);
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DESCRIPTION
The fchownat() system call operates in exactly the same way as
chown(2),
except for the differences described in this manual page.
If the pathname given in
path 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
chown(2)
for a relative pathname).
If the pathname given in
path is relative and
dirfd is the special value
AT_FDCWD, then
path is interpreted relative to the current working
directory of the calling process (like
chown(2)).
If the pathname given in
path is absolute, then
dirfd is ignored.
flags can either be 0, or include the following flag:
Tag | Description |
AT_SYMLINK_NOFOLLOW |
If
path is a symbolic link, do not dereference it:
instead operate on the link itself, like
lchown(2).
(By default,
fchownat() dereferences symbolic links, like
chown(2).)
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RETURN VALUE
On success,
fchownat() returns 0.
On error, -1 is returned and
errno is set to indicate the error.
ERRORS
The same errors that occur for
chown(2)
can also occur for
fchownat(). The following additional errors can occur for
fchownat():
Tag | Description |
EBADF |
dirfd is not a valid file descriptor.
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EINVAL |
Invalid flag specified in
flags. |
ENOTDIR |
path is a relative path and
dirfd is a file descriptor referring to a file other than a directory.
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NOTES
See
openat(2)
for an explanation of the need for
fchownat().
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
fchownat() was added to Linux in kernel 2.6.16.
SEE ALSO
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