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fchflags
CHFLAGS(2) FreeBSD System Calls Manual CHFLAGS(2)
NAME
chflags, lchflags, fchflags -- set file flags
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/stat.h>
#include <unistd.h>
int
chflags(const char *path, u_long flags);
int
lchflags(const char *path, int flags);
int
fchflags(int fd, u_long flags);
DESCRIPTION
The file whose name is given by path or referenced by the descriptor fd
has its flags changed to flags.
The lchflags() system call is like chflags() except in the case where the
named file is a symbolic link, in which case lchflags() will change the
flags of the link itself, rather than the file it points to.
The flags specified are formed by or'ing 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.
UF_NOUNLINK The file may not be renamed or deleted.
UF_OPAQUE The directory is opaque when viewed through a union
stack.
SF_ARCHIVED The file may be archived.
SF_IMMUTABLE The file may not be changed.
SF_APPEND The file may only be appended to.
SF_NOUNLINK The file may not be renamed or deleted.
SF_SNAPSHOT The file is a snapshot file.
If one of ``SF_IMMUTABLE'', ``SF_APPEND'', or ``SF_NOUNLINK'' is set a
non-super-user cannot change any flags and even the super-user can change
flags only if securelevel is greater than 0. (See init(8) for details.)
The ``UF_IMMUTABLE'', ``UF_APPEND'', ``UF_NOUNLINK'', ``UF_NODUMP'', and
``UF_OPAQUE'' flags may be set or unset by either the owner of a file or
the super-user.
The ``SF_IMMUTABLE'', ``SF_APPEND'', ``SF_NOUNLINK'', and ``SF_ARCHIVED''
flags may only be set or unset by the super-user. Attempts to set these
flags by non-super-users are rejected, attempts by non-superusers to
clear flags that are already unset are silently ignored. These flags 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 ``SF_SNAPSHOT'' flag is maintained by the system and cannot be
changed by any user.
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
The chflags() system call will fail if:
[ENOTDIR] A component of the path prefix is not a directory.
[ENAMETOOLONG] A component of a pathname exceeded 255 characters, or
an entire path name exceeded 1023 characters.
[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 translat-
ing the pathname.
[EPERM] The effective user ID does not match the owner of the
file and the effective user ID is not the super-user.
[EPERM] One of ``SF_IMMUTABLE'', ``SF_APPEND'', or
``SF_NOUNLINK'' is set and the user is either not the
super-user or securelevel is greater than 0.
[EPERM] A non-super-user tries to set one of ``SF_IMMUTABLE'',
``SF_APPEND'', or ``SF_NOUNLINK''.
[EROFS] The named file resides on a read-only file system.
[EFAULT] The path argument points outside the process's allo-
cated address space.
[EIO] An I/O error occurred while reading from or writing to
the file system.
[EOPNOTSUPP] The underlying file system does not support file
flags.
The fchflags() system call will fail if:
[EBADF] The descriptor is not valid.
[EINVAL] The fd argument refers to a socket, not to a file.
[EPERM] The effective user ID does not match the owner of the
file and the effective user ID is not the super-user.
[EPERM] One of ``SF_IMMUTABLE'', ``SF_APPEND'', or
``SF_NOUNLINK'' is set and the user is either not the
super-user or securelevel is greater than 0.
[EPERM] A non-super-user tries to set one of ``SF_IMMUTABLE'',
``SF_APPEND'', or ``SF_NOUNLINK''.
[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.
[EOPNOTSUPP] The underlying file system does not support file
flags.
SEE ALSO
chflags(1), fflagstostr(3), strtofflags(3), init(8), mount_unionfs(8)
HISTORY
The chflags() and fchflags() system calls first appeared in 4.4BSD.
FreeBSD 6.2 Jun 23, 2006 FreeBSD 6.2
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