ATTR_LIST man page on Archlinux

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ATTR_LIST(3)		     XFS Compatibility API		  ATTR_LIST(3)

       attr_list,  attr_listf  -  list	the  names of the user attributes of a
       filesystem object

       #include <sys/attributes.h>

       int attr_list (const char ∗path, char ∗buffer,
		      const int buffersize, int flags,
		      attrlist_cursor_t ∗cursor);

       int attr_listf (int fd, char ∗buffer,
		       const int buffersize, int flags,
		       attrlist_cursor_t ∗cursor);

       The attr_list and attr_listf functions provide a way to list the exist‐
       ing attributes of a filesystem object.

       Path  points  to	 a path name for a filesystem object, and fd refers to
       the file descriptor associated with a file.  The buffer will be	filled
       with  a structure describing at least a portion of the attributes asso‐
       ciated with the given filesystem object.	 Buffer	 will  be  overwritten
       with  an attrlist_t structure containing a list of the attributes asso‐
       ciated with that filesystem object,  up	to  a  maximum	of  buffersize
       bytes.	The  buffer must be sufficiently large to hold the appropriate
       data structures plus at least one maximally sized attribute  name,  but
       cannot be more than ATTR_MAX_VALUELEN (currently 64KB) bytes in length.

       The contents of an attrlist_t structure include the following members:

	  __int32_t al_count; /∗ number of entries in attrlist ∗/
	  __int32_t al_more; /∗ T/F: more attrs (do syscall again) ∗/
	  __int32_t al_offset[1]; /∗ byte offsets of attrs [var-sized] ∗/

       The  al_count  field shows the number of attributes represented in this
       buffer, which is also the number of elements in	the  al_offset	array.
       The  al_more  field  will  be  non-zero if another attr_list call would
       result in more attributes.  The al_offset array contains the byte  off‐
       set  within  the	 buffer	 of  the  structure  describing	 each  of  the
       attributes, an attrlist_ent_t structure.	 The ATTR_ENTRY(buffer, index)
       macro will help with decoding the list.	It takes a pointer to the buf‐
       fer and an index into the al_offset array and returns a pointer to  the
       corresponding attrlist_ent_t structure.

       The  contents of an attrlist_ent_t structure include the following mem‐

	  u_int32_t a_valuelen; /∗ number bytes in value of attr ∗/
	  char a_name[]; /∗ attr name (NULL terminated) ∗/

       The a_valuelen field shows the size in bytes of	the  value  associated
       with  the attribute whose name is stored in the a_name field.  The name
       is a NULL terminated string.

       Note that the value of the attribute cannot be  obtained	 through  this
       interface,  the	attr_get  call	should	be used to get the value.  The
       attr_list interface tells the calling process how large of a buffer  it
       must have in order to get the attribute´s value.

       The  flags  argument  can  contain  the following symbols bitwise OR´ed

	      List the attributes that are in the root address space,  not  in
	      the user address space.  (limited to use by super-user only)

	      Do  not  follow  symbolic	 links	when  resolving	 a  path on an
	      attr_list function call.	The  default  is  to  follow  symbolic

       The  cursor  argument is a pointer to an opaque data structure that the
       kernel uses to track the calling process´s position  in	the  attribute
       list.   The  only  valid	 operations on a cursor are to pass it into an
       attr_list function call or to zero it out.  It should  be  zero´ed  out
       before the first attr_list call.	 Note that multi-threaded applications
       may keep more than one cursor in order to serve multiple contexts,  ie:
       the attr_list call is "thread-safe".

       attr_list will fail if one or more of the following are true:

       [ENOENT]		The named file does not exist.

       [EPERM]		The  effective user ID does not match the owner of the
			file and the effective user ID is not super-user.

       [ENOTDIR]	A component of the path prefix is not a directory.

       [EACCES]		Search permission is denied on a component of the path

       [EINVAL]		A bit was set in the flag argument that is not defined
			for this system call, or the buffer was too  small  or
			too large.

       [EFAULT]		Either	Path  or  buffer  points outside the allocated
			address space of the process, or buffer or bufsize are
			not 32bit aligned.

       [ELOOP]		A path name lookup involved too many symbolic links.

       [ENAMETOOLONG]	The length of path exceeds {MAXPATHLEN}, or a pathname
			component is longer than {MAXNAMELEN}.

       [ENOATTR]	attribute does not exist for this file.

       attr_listf will fail if:

       [EINVAL]	      A bit was set in the flag argument that is  not  defined
		      for  this	 system	 call, or fd refers to a socket, not a
		      file, or the buffer was too small or too large.

       [EFAULT]	      Either Path  or  buffer  points  outside	the  allocated
		      address  space  of the process, or buffer or bufsize are
		      not 32bit aligned.

       [EBADF]	      Fd does not refer to a valid descriptor.

       Upon successful completion, a value of 0	 is  returned.	 Otherwise,  a
       value of -1 is returned and errno is set to indicate the error.

       attr(1), attr_multi(3), attr_remove(3), and attr_set(3).

Dec 2005		      Extended Attributes		  ATTR_LIST(3)

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