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chflags (2)
  • chflags (1) ( FreeBSD man: Команды и прикладные программы пользовательского уровня )
  • >> chflags (2) ( FreeBSD man: Системные вызовы )

  • BSD mandoc
     

    NAME

    
    
    chflags
    
     
    lchflags
    
     
    fchflags
    
     - set file flags
    
     
    

    LIBRARY

    Lb libc
    
     
    

    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 Fa path or referenced by the descriptor Fa fd has its flags changed to Fa 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

    Rv -std  

    ERRORS

    The chflags ();
    system call will fail if:

    Bq Er ENOTDIR
    A component of the path prefix is not a directory.
    Bq Er ENAMETOOLONG
    A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters.
    Bq Er ENOENT
    The named file does not exist.
    Bq Er EACCES
    Search permission is denied for a component of the path prefix.
    Bq Er ELOOP
    Too many symbolic links were encountered in translating the pathname.
    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.
    Bq Er 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.
    Bq Er EPERM
    A non-super-user tries to set one of SF_IMMUTABLE , SF_APPEND or SF_NOUNLINK
    Bq Er EPERM
    User tries to set or remove the SF_SNAPSHOT flag.
    Bq Er EROFS
    The named file resides on a read-only file system.
    Bq Er EFAULT
    The Fa path argument points outside the process's allocated address space.
    Bq Er EIO
    An I/O error occurred while reading from or writing to the file system.
    Bq Er EOPNOTSUPP
    The underlying file system does not support file flags.

    The fchflags ();
    system call will fail if:

    Bq Er EBADF
    The descriptor is not valid.
    Bq Er EINVAL
    The Fa fd argument refers to a socket, not to a file.
    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.
    Bq Er 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.
    Bq Er EPERM
    A non-super-user tries to set one of SF_IMMUTABLE , SF_APPEND or SF_NOUNLINK
    Bq Er EROFS
    The file resides on a read-only file system.
    Bq Er EIO
    An I/O error occurred while reading from or writing to the file system.
    Bq Er EOPNOTSUPP
    The underlying file system does not support file flags.

     

    SEE ALSO

    chflags(1), fflagstostr(3), strtofflags(3), init(8), mount_unionfs8  

    HISTORY

    The chflags ();
    and fchflags ();
    system calls first appeared in BSD 4.4


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    SEE ALSO
    HISTORY


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