NAME
chflags
,
chflagsat
, fchflags
—
set file flags
SYNOPSIS
#include
<sys/stat.h>
int
chflags
(const
char *path, unsigned int
flags);
int
fchflags
(int
fd, unsigned int
flags);
#include
<sys/stat.h>
#include <fcntl.h>
int
chflagsat
(int
fd, const char
*path, unsigned int
flags, int
atflags);
DESCRIPTION
The file whose name is given by path or referenced by the descriptor fd has its flags changed to flags.
The flags are the bitwise OR of zero or more of the following values:
UF_NODUMP
- Do not dump the file.
UF_IMMUTABLE
- The file may not be changed.
UF_APPEND
- The file may only be appended to.
SF_ARCHIVED
- The file may be archived.
SF_IMMUTABLE
- The file may not be changed.
SF_APPEND
- The file may only be appended to.
The UF_IMMUTABLE
and
UF_APPEND
flags may be set or unset by either the
owner of a file or the superuser.
The SF_ARCHIVED
,
SF_IMMUTABLE
and SF_APPEND
flags may only be set or unset by the superuser. They may be set at any
time, but normally may only be unset when the system is in single-user mode.
(See init(8) for details.)
The
chflagsat
()
function is equivalent to
chflags
()
except in the case where path specifies a relative
path. In this case the file to be changed is determined relative to the
directory associated with the file descriptor fd
instead of the current working directory.
If
chflagsat
()
is passed the special value AT_FDCWD
(defined in
<fcntl.h>
) in the
fd parameter, the current working directory is used.
If atflags is also zero, the behavior is identical to
a call to
chflags
().
The atflags argument is the bitwise OR of zero or more of the following values:
AT_SYMLINK_NOFOLLOW
- If path names a symbolic link, then the flags of the symbolic link are changed.
The
fchflags
()
function is equivalent to
chflags
()
except that the file whose flags are changed is specified by the file
descriptor fd.
RETURN VALUES
Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error.
ERRORS
chflags
() will fail if:
- [
ENOTDIR
] - A component of the path prefix is not a directory.
- [
ENAMETOOLONG
] - A component of a pathname exceeded
NAME_MAX
characters, or an entire pathname (including the terminating NUL) exceededPATH_MAX
bytes. - [
ENOENT
] - The named file does not exist.
- [
EACCES
] - Search permission is denied for a component of the path prefix.
- [
ELOOP
] - Too many symbolic links were encountered in translating the pathname.
- [
EPERM
] - The effective user ID does not match the owner of the file and the effective user ID is not the superuser, or the effective user ID is not the superuser and at least one of the super-user-only flags for the named file would be changed.
- [
EOPNOTSUPP
] - The named file resides on a file system that does not support file flags.
- [
EROFS
] - The named file resides on a read-only file system.
- [
EFAULT
] - path points outside the process's allocated address space.
- [
EIO
] - An I/O error occurred while reading from or writing to the file system.
- [
EINVAL
] - The flags value is invalid.
- [
EINVAL
] - The descriptor references a block or character device and the effective user ID is not the superuser.
fchflags
() will fail if:
- [
EBADF
] - The descriptor is not valid.
- [
EINVAL
] - fd refers to a socket, not to a file.
- [
EINVAL
] - The descriptor references a block or character device and the effective user ID is not the superuser.
- [
EINVAL
] - The flags value is invalid.
- [
EPERM
] - The effective user ID does not match the owner of the file and the effective user ID is not the superuser, or the effective user ID is not the superuser and at least one of the super-user-only flags for the named file would be changed.
- [
EOPNOTSUPP
] - The named file resides on a file system that does not support file flags.
- [
EROFS
] - The file resides on a read-only file system.
- [
EIO
] - An I/O error occurred while reading from or writing to the file system.
SEE ALSO
HISTORY
The chflags
() and
fchflags
() functions first appeared in
4.4BSD. The chflagsat
()
function first appeared in FreeBSD 10.0. It was
added to OpenBSD in OpenBSD
5.7.