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@(#)chflags.2 8.3 (Berkeley) 5/2/95
$FreeBSD: head/lib/libc/sys/chflags.2 162385 2006-09-17 21:27:35Z ru $
.Dd May 16, 2006 .Dt CHFLAGS 2 .Os .Sh NAME .Nm chflags , .Nm lchflags , .Nm fchflags .Nd set file flags .Sh LIBRARY .Lb libc .Sh SYNOPSIS n sys/stat.h n unistd.h .Ft int .Fn chflags "const char *path" "u_long flags" .Ft int .Fn lchflags "const char *path" "int flags" .Ft int .Fn fchflags "int fd" "u_long flags" .Sh DESCRIPTION The file whose name is given by .Fa path or referenced by the descriptor .Fa fd has its flags changed to .Fa flags .
p The .Fn lchflags system call is like .Fn chflags except in the case where the named file is a symbolic link, in which case .Fn lchflags will change the flags of the link itself, rather than the file it points to.
p The flags specified are formed by .Em or Ns 'ing the following values
p l -tag -width ".Dv SF_IMMUTABLE" -compact -offset indent t Dv UF_NODUMP Do not dump the file. t Dv UF_IMMUTABLE The file may not be changed. t Dv UF_APPEND The file may only be appended to. t Dv UF_NOUNLINK The file may not be renamed or deleted. t Dv UF_OPAQUE The directory is opaque when viewed through a union stack. t Dv SF_ARCHIVED The file may be archived. t Dv SF_IMMUTABLE The file may not be changed. t Dv SF_APPEND The file may only be appended to. t Dv SF_NOUNLINK The file may not be renamed or deleted. t Dv SF_SNAPSHOT The file is a snapshot file. .El
p If one of .Dv SF_IMMUTABLE , SF_APPEND , or .Dv 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 .Xr init 8 for details.)
p The .Dv UF_IMMUTABLE , UF_APPEND , UF_NOUNLINK , UF_NODUMP , and .Dv UF_OPAQUE flags may be set or unset by either the owner of a file or the super-user.
p The .Dv SF_IMMUTABLE , SF_APPEND , SF_NOUNLINK , and .Dv 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 .Xr init 8 for details.)
p The .Dv SF_SNAPSHOT flag is maintained by the system and cannot be changed by any user. .Sh RETURN VALUES .Rv -std .Sh ERRORS The .Fn chflags system call will fail if: l -tag -width Er t Bq Er ENOTDIR A component of the path prefix is not a directory. t Bq Er ENAMETOOLONG A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters. t Bq Er ENOENT The named file does not exist. t Bq Er EACCES Search permission is denied for a component of the path prefix. t Bq Er ELOOP Too many symbolic links were encountered in translating the pathname. t Bq Er EPERM The effective user ID does not match the owner of the file and the effective user ID is not the super-user. t Bq Er EPERM One of .Dv SF_IMMUTABLE , SF_APPEND , or .Dv SF_NOUNLINK is set and the user is either not the super-user or securelevel is greater than 0. t Bq Er EPERM A non-super-user tries to set one of .Dv SF_IMMUTABLE , SF_APPEND , or .Dv SF_NOUNLINK . t Bq Er EROFS The named file resides on a read-only file system. t Bq Er EFAULT The .Fa path argument points outside the process's allocated address space. t Bq Er EIO An .Tn I/O error occurred while reading from or writing to the file system. t Bq Er EOPNOTSUPP The underlying file system does not support file flags. .El
p The .Fn fchflags system call will fail if: l -tag -width Er t Bq Er EBADF The descriptor is not valid. t Bq Er EINVAL The .Fa fd argument refers to a socket, not to a file. t Bq Er EPERM The effective user ID does not match the owner of the file and the effective user ID is not the super-user. t Bq Er EPERM One of .Dv SF_IMMUTABLE , SF_APPEND , or .Dv SF_NOUNLINK is set and the user is either not the super-user or securelevel is greater than 0. t Bq Er EPERM A non-super-user tries to set one of .Dv SF_IMMUTABLE , SF_APPEND , or .Dv SF_NOUNLINK . t Bq Er EROFS The file resides on a read-only file system. t Bq Er EIO An .Tn I/O error occurred while reading from or writing to the file system. t Bq Er EOPNOTSUPP The underlying file system does not support file flags. .El .Sh SEE ALSO .Xr chflags 1 , .Xr fflagstostr 3 , .Xr strtofflags 3 , .Xr init 8 , .Xr mount_unionfs 8 .Sh HISTORY The .Fn chflags and .Fn fchflags system calls first appeared in x 4.4 .