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FCHMODAT(2) Linux Programmer's Manual FCHMODAT(2)
fchmodat - change permissions of a file relative to a directory file descrip-
tor
#include <fcntl.h> /* Definition of AT_* constants */
#include <sys/stat.h>
int fchmodat(int dirfd, const char *pathname, mode_t mode, int flags);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
fchmodat():
Since glibc 2.10:
_XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
Before glibc 2.10:
_ATFILE_SOURCE
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.
On success, fchmodat() returns 0. On error, -1 is returned and errno is set
to indicate the error.
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.
fchmodat() was added to Linux in kernel 2.6.16.
POSIX.1-2008.
See openat(2) for an explanation of the need for fchmodat().
chmod(2), openat(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 2009-12-13 FCHMODAT(2)
HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface