Name
fchmodat — change permissions of a file relative to
a directory file descriptor
Synopsis
int
fchmodat( |
int |
dirfd, |
| |
const char * |
pathname, |
| |
mode_t |
mode, |
| |
int |
flags); |
DESCRIPTION
The fchmodat() system call
operates in exactly the same way as chmod(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 chmod(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 chmod(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
operate on the link itself. This flag is not currently
implemented.
RETURN VALUE
On success, fchmodat()
returns 0. On error, −1 is returned and errno is set to indicate the error.
ERRORS
The same errors that occur for chmod(2) can also occur for
fchmodat(). The following
additional errors can occur for fchmodat():
- 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.
ENOTSUP-
flags
specified AT_SYMLINK_NOFOLLOW, which is not
supported.
VERSIONS
fchmodat() was added to
Linux in kernel 2.6.16.
CONFORMING TO
This system call is non-standard but is proposed for
inclusion in a future revision of POSIX.1.
NOTES
See openat(2) for an
explanation of the need for fchmodat().
SEE ALSO
chmod(2), openat(2), path_resolution(7)
This manpage is Copyright (C) 2006, Michael Kerrisk
Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.
Permission is granted to copy and distribute modified versions of this
manual under the conditions for verbatim copying, provided that the
entire resulting derived work is distributed under the terms of a
permission notice identical to this one.
Since the Linux kernel and libraries are constantly changing, this
manual page may be incorrect or out-of-date. The author(s) assume no
responsibility for errors or omissions, or for damages resulting from
the use of the information contained herein. The author(s) may not
have taken the same level of care in the production of this manual,
which is licensed free of charge, as they might when working
professionally.
Formatted or processed versions of this manual, if unaccompanied by
the source, must acknowledge the copyright and authors of this work.
|
