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CHFLAGS(2)		  FreeBSD System Calls Manual		    CHFLAGS(2)

NAME
     chflags, 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
     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 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.

     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 by the	non-
     super-user	to set the super-user only flags 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.)

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 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.

     [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.

     [EOPNOTSUPP]	The underlying file system does	not support file
			flags.

     Fchflags()	will fail if:

     [EBADF]		The descriptor is not valid.

     [EINVAL]		fd 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.

     [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_union(8)

HISTORY
     The chflags and fchflags functions	first appeared in 4.4BSD.

FreeBSD	11.1			  May 2, 1995			  FreeBSD 11.1
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | HISTORY

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