mirror of https://gitlab.com/drummyfish/anarch.git
201 lines
7.4 KiB
C
201 lines
7.4 KiB
C
/*
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* Copyright (c) 2001-2002,2004 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ATTRIBUTES_H__
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#define __ATTRIBUTES_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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#ifndef ENOATTR
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# define ENOATTR ENODATA
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#endif
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/*
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* An almost-IRIX-compatible extended attributes API
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* (the IRIX attribute "list" operation is missing, added ATTR_SECURE).
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*/
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/*
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* The maximum size (into the kernel or returned from the kernel) of an
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* attribute value or the buffer used for an attr_list() call. Larger
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* sizes will result in an E2BIG return code.
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*/
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#define ATTR_MAX_VALUELEN (64*1024) /* max length of a value */
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/*
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* Flags that can be used with any of the simple attribute calls.
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* All desired flags should be bit-wise OR'ed together.
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*/
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#define ATTR_DONTFOLLOW 0x0001 /* do not follow symlinks for a pathname */
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#define ATTR_ROOT 0x0002 /* use root namespace attributes in op */
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#define ATTR_TRUST 0x0004 /* tell server we can be trusted to properly
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handle extended attributes */
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#define ATTR_SECURE 0x0008 /* use security namespace attributes in op */
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/*
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* Additional flags that can be used with the set() attribute call.
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* All desired flags (from both lists) should be bit-wise OR'ed together.
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*/
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#define ATTR_CREATE 0x0010 /* pure create: fail if attr already exists */
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#define ATTR_REPLACE 0x0020 /* pure set: fail if attr does not exist */
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/*
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* Define how lists of attribute names are returned to the user from
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* the attr_list() call. A large, 32bit aligned, buffer is passed in
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* along with its size. We put an array of offsets at the top that each
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* reference an attrlist_ent_t and pack the attrlist_ent_t's at the bottom.
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*/
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typedef struct attrlist {
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int32_t al_count; /* number of entries in attrlist */
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int32_t al_more; /* T/F: more attrs (do call again) */
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int32_t al_offset[1]; /* byte offsets of attrs [var-sized] */
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} attrlist_t;
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/*
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* Show the interesting info about one attribute. This is what the
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* al_offset[i] entry points to.
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*/
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typedef struct attrlist_ent { /* data from attr_list() */
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uint32_t a_valuelen; /* number bytes in value of attr */
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char a_name[1]; /* attr name (NULL terminated) */
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} attrlist_ent_t;
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/*
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* Given a pointer to the (char*) buffer containing the attr_list() result,
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* and an index, return a pointer to the indicated attribute in the buffer.
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*/
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#define ATTR_ENTRY(buffer, index) \
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((attrlist_ent_t *) \
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&((char *)buffer)[ ((attrlist_t *)(buffer))->al_offset[index] ])
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/*
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* Implement a "cursor" for use in successive attr_list() calls.
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* It provides a way to find the last attribute that was returned in the
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* last attr_list() call so that we can get the next one without missing
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* any. This should be bzero()ed before use and whenever it is desired to
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* start over from the beginning of the attribute list. The only valid
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* operation on a cursor is to bzero() it.
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*/
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typedef struct attrlist_cursor {
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uint32_t opaque[4]; /* an opaque cookie */
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} attrlist_cursor_t;
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/*
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* Multi-attribute operation vector.
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*/
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typedef struct attr_multiop {
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int32_t am_opcode; /* operation to perform (ATTR_OP_GET, etc.) */
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int32_t am_error; /* [out arg] result of this sub-op (an errno) */
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char *am_attrname; /* attribute name to work with */
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char *am_attrvalue; /* [in/out arg] attribute value (raw bytes) */
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int32_t am_length; /* [in/out arg] length of value */
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int32_t am_flags; /* flags (bit-wise OR of #defines above) */
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} attr_multiop_t;
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#define ATTR_MAX_MULTIOPS 128 /* max number ops in an oplist array */
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/*
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* Valid values of am_opcode.
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*/
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#define ATTR_OP_GET 1 /* return the indicated attr's value */
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#define ATTR_OP_SET 2 /* set/create the indicated attr/value pair */
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#define ATTR_OP_REMOVE 3 /* remove the indicated attr */
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/*
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* Get the value of an attribute.
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* Valuelength must be set to the maximum size of the value buffer, it will
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* be set to the actual number of bytes used in the value buffer upon return.
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* The return value is -1 on error (w/errno set appropriately), 0 on success.
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*/
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extern int attr_get (const char *__path, const char *__attrname,
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char *__attrvalue, int *__valuelength, int __flags)
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__attribute__ ((deprecated));
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extern int attr_getf (int __fd, const char *__attrname, char *__attrvalue,
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int *__valuelength, int __flags)
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__attribute__ ((deprecated));
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/*
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* Set the value of an attribute, creating the attribute if necessary.
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* The return value is -1 on error (w/errno set appropriately), 0 on success.
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*/
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extern int attr_set (const char *__path, const char *__attrname,
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const char *__attrvalue, const int __valuelength,
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int __flags)
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__attribute__ ((deprecated));
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extern int attr_setf (int __fd, const char *__attrname,
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const char *__attrvalue, const int __valuelength,
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int __flags)
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__attribute__ ((deprecated));
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/*
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* Remove an attribute.
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* The return value is -1 on error (w/errno set appropriately), 0 on success.
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*/
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extern int attr_remove (const char *__path, const char *__attrname,
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int __flags)
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__attribute__ ((deprecated));
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extern int attr_removef (int __fd, const char *__attrname, int __flags)
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__attribute__ ((deprecated));
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/*
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* List the names and sizes of the values of all the attributes of an object.
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* "Cursor" must be allocated and zeroed before the first call, it is used
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* to maintain context between system calls if all the attribute names won't
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* fit into the buffer on the first system call.
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* The return value is -1 on error (w/errno set appropriately), 0 on success.
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*/
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extern int attr_list(const char *__path, char *__buffer, const int __buffersize,
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int __flags, attrlist_cursor_t *__cursor)
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__attribute__ ((deprecated));
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extern int attr_listf(int __fd, char *__buffer, const int __buffersize,
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int __flags, attrlist_cursor_t *__cursor)
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__attribute__ ((deprecated));
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/*
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* Operate on multiple attributes of the same object simultaneously.
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*
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* This call will save on system call overhead when many attributes are
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* going to be operated on.
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*
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* The return value is -1 on error (w/errno set appropriately), 0 on success.
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* Note that this call will not return -1 as a result of failure of any
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* of the sub-operations, their return value is stored in each element
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* of the operation array. This call will return -1 for a failure of the
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* call as a whole, eg: if the pathname doesn't exist, or the fd is bad.
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*
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* The semantics and allowable values for the fields in a attr_multiop_t
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* are the same as the semantics and allowable values for the arguments to
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* the corresponding "simple" attribute interface. For example: the args
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* to a ATTR_OP_GET are the same as the args to an attr_get() call.
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*/
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extern int attr_multi (const char *__path, attr_multiop_t *__oplist,
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int __count, int __flags)
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__attribute__ ((deprecated));
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extern int attr_multif (int __fd, attr_multiop_t *__oplist,
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int __count, int __flags)
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__attribute__ ((deprecated));
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#ifdef __cplusplus
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}
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#endif
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#endif /* __ATTRIBUTES_H__ */
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