fchmodat — change permissions of a file relative to a directory file descriptor
#define _ATFILE_SOURCE #include <sys/stat.h>
int
fchmodat( |
int | dirfd, |
const char * | pathname, | |
mode_t | mode, | |
int | flags) ; |
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
():
dirfd
is not
a valid file descriptor.
Invalid flag specified in flags
.
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.
This system call is non-standard but is proposed for inclusion in a future revision of POSIX.1.
chmod(2), openat(2), path_resolution(7)
|