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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.

     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

     The chflags() system call will fail if:
     [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]		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.

     [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 5.4			  May 5, 2002			   FreeBSD 5.4

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