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- /*
- * Copyright (c) 2001-2002,2004 Silicon Graphics, Inc. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of version 2.1 of the GNU Lesser General Public License
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it would be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- *
- * Further, this software is distributed without any warranty that it is
- * free of the rightful claim of any third person regarding infringement
- * or the like. Any license provided herein, whether implied or
- * otherwise, applies only to this software file. Patent licenses, if
- * any, provided herein do not apply to combinations of this program with
- * other software, or any other product whatsoever.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this program; if not, write the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307,
- * USA.
- *
- * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
- * Mountain View, CA 94043, or:
- *
- * http://www.sgi.com
- *
- * For further information regarding this notice, see:
- *
- * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
- */
- #ifndef __ATTRIBUTES_H__
- #define __ATTRIBUTES_H__
-
- #ifdef __cplusplus
- extern "C" {
- #endif
-
- /*
- * An almost-IRIX-compatible extended attributes API
- * (the IRIX attribute "list" operation is missing, added ATTR_SECURE).
- */
-
- /*
- * The maximum size (into the kernel or returned from the kernel) of an
- * attribute value or the buffer used for an attr_list() call. Larger
- * sizes will result in an E2BIG return code.
- */
- #define ATTR_MAX_VALUELEN (64*1024) /* max length of a value */
-
-
- /*
- * Flags that can be used with any of the simple attribute calls.
- * All desired flags should be bit-wise OR'ed together.
- */
- #define ATTR_DONTFOLLOW 0x0001 /* do not follow symlinks for a pathname */
- #define ATTR_ROOT 0x0002 /* use root namespace attributes in op */
- #define ATTR_TRUST 0x0004 /* tell server we can be trusted to properly
- handle extended attributes */
- #define ATTR_SECURE 0x0008 /* use security namespace attributes in op */
-
- /*
- * Additional flags that can be used with the set() attribute call.
- * All desired flags (from both lists) should be bit-wise OR'ed together.
- */
- #define ATTR_CREATE 0x0010 /* pure create: fail if attr already exists */
- #define ATTR_REPLACE 0x0020 /* pure set: fail if attr does not exist */
-
- /*
- * Define how lists of attribute names are returned to the user from
- * the attr_list() call. A large, 32bit aligned, buffer is passed in
- * along with its size. We put an array of offsets at the top that each
- * reference an attrlist_ent_t and pack the attrlist_ent_t's at the bottom.
- */
- typedef struct attrlist {
- int32_t al_count; /* number of entries in attrlist */
- int32_t al_more; /* T/F: more attrs (do call again) */
- int32_t al_offset[1]; /* byte offsets of attrs [var-sized] */
- } attrlist_t;
-
- /*
- * Show the interesting info about one attribute. This is what the
- * al_offset[i] entry points to.
- */
- typedef struct attrlist_ent { /* data from attr_list() */
- u_int32_t a_valuelen; /* number bytes in value of attr */
- char a_name[1]; /* attr name (NULL terminated) */
- } attrlist_ent_t;
-
- /*
- * Given a pointer to the (char*) buffer containing the attr_list() result,
- * and an index, return a pointer to the indicated attribute in the buffer.
- */
- #define ATTR_ENTRY(buffer, index) \
- ((attrlist_ent_t *) \
- &((char *)buffer)[ ((attrlist_t *)(buffer))->al_offset[index] ])
-
- /*
- * Implement a "cursor" for use in successive attr_list() calls.
- * It provides a way to find the last attribute that was returned in the
- * last attr_list() call so that we can get the next one without missing
- * any. This should be bzero()ed before use and whenever it is desired to
- * start over from the beginning of the attribute list. The only valid
- * operation on a cursor is to bzero() it.
- */
- typedef struct attrlist_cursor {
- u_int32_t opaque[4]; /* an opaque cookie */
- } attrlist_cursor_t;
-
- /*
- * Multi-attribute operation vector.
- */
- typedef struct attr_multiop {
- int32_t am_opcode; /* operation to perform (ATTR_OP_GET, etc.) */
- int32_t am_error; /* [out arg] result of this sub-op (an errno) */
- char *am_attrname; /* attribute name to work with */
- char *am_attrvalue; /* [in/out arg] attribute value (raw bytes) */
- int32_t am_length; /* [in/out arg] length of value */
- int32_t am_flags; /* flags (bit-wise OR of #defines above) */
- } attr_multiop_t;
- #define ATTR_MAX_MULTIOPS 128 /* max number ops in an oplist array */
-
- /*
- * Valid values of am_opcode.
- */
- #define ATTR_OP_GET 1 /* return the indicated attr's value */
- #define ATTR_OP_SET 2 /* set/create the indicated attr/value pair */
- #define ATTR_OP_REMOVE 3 /* remove the indicated attr */
-
- /*
- * Get the value of an attribute.
- * Valuelength must be set to the maximum size of the value buffer, it will
- * be set to the actual number of bytes used in the value buffer upon return.
- * The return value is -1 on error (w/errno set appropriately), 0 on success.
- */
- extern int attr_get (const char *__path, const char *__attrname,
- char *__attrvalue, int *__valuelength, int __flags);
- extern int attr_getf (int __fd, const char *__attrname, char *__attrvalue,
- int *__valuelength, int __flags);
-
- /*
- * Set the value of an attribute, creating the attribute if necessary.
- * The return value is -1 on error (w/errno set appropriately), 0 on success.
- */
- extern int attr_set (const char *__path, const char *__attrname,
- const char *__attrvalue, const int __valuelength,
- int __flags);
- extern int attr_setf (int __fd, const char *__attrname,
- const char *__attrvalue, const int __valuelength,
- int __flags);
-
- /*
- * Remove an attribute.
- * The return value is -1 on error (w/errno set appropriately), 0 on success.
- */
- extern int attr_remove (const char *__path, const char *__attrname,
- int __flags);
- extern int attr_removef (int __fd, const char *__attrname, int __flags);
-
- /*
- * Operate on multiple attributes of the same object simultaneously.
- *
- * This call will save on system call overhead when many attributes are
- * going to be operated on.
- *
- * The return value is -1 on error (w/errno set appropriately), 0 on success.
- * Note that this call will not return -1 as a result of failure of any
- * of the sub-operations, their return value is stored in each element
- * of the operation array. This call will return -1 for a failure of the
- * call as a whole, eg: if the pathname doesn't exist, or the fd is bad.
- *
- * The semantics and allowable values for the fields in a attr_multiop_t
- * are the same as the semantics and allowable values for the arguments to
- * the corresponding "simple" attribute interface. For example: the args
- * to a ATTR_OP_GET are the same as the args to an attr_get() call.
- */
- extern int attr_multi (const char *__path, attr_multiop_t *__oplist,
- int __count, int __flags);
- extern int attr_multif (int __fd, attr_multiop_t *__oplist,
- int __count, int __flags);
-
- #ifdef __cplusplus
- }
- #endif
-
- #endif /* __ATTRIBUTES_H__ */
-