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devattr_enumerate.c
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devattr_enumerate.c
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/*
* Copyright (c) 2010 The DragonFly Project. All rights reserved.
*
* This code is derived from software contributed to The DragonFly Project
* by Alex Hornung <ahornung@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name of The DragonFly Project nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific, prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/device.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/poll.h>
#include <sys/queue.h>
#include <sys/un.h>
#include <cpu/inttypes.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <regex.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <pthread.h>
#include <libprop/proplib.h>
#include <sys/udev.h>
#define LIBDEVATTR_INTERNAL
#include "devattr.h"
struct udev_enumerate {
struct udev *udev_ctx;
prop_array_t ev_filt;
prop_array_t pa;
int refs;
TAILQ_HEAD(, udev_list_entry) list_entries;
};
struct udev_list_entry {
struct udev *udev_ctx;
prop_dictionary_t dict;
TAILQ_ENTRY(udev_list_entry) link;
};
struct udev_enumerate *
udev_enumerate_new(struct udev *udev_ctx)
{
struct udev_enumerate *udev_enum;
udev_enum = malloc(sizeof(struct udev_enumerate));
udev_enum->refs = 1;
udev_enum->ev_filt = NULL;
udev_enum->pa = NULL;
TAILQ_INIT(&udev_enum->list_entries);
udev_enum->udev_ctx = udev_ref(udev_ctx);
return udev_enum;
}
struct udev_enumerate *
udev_enumerate_ref(struct udev_enumerate *udev_enum)
{
atomic_add_int(&udev_enum->refs, 1);
return udev_enum;
}
void
udev_enumerate_unref(struct udev_enumerate *udev_enum)
{
struct udev_list_entry *le;
int refcount;
refcount = atomic_fetchadd_int(&udev_enum->refs, -1);
if (refcount == 1) {
atomic_subtract_int(&udev_enum->refs, 0x400); /* in destruction */
if (udev_enum->pa != NULL)
prop_object_release(udev_enum->pa);
if (udev_enum->ev_filt != NULL)
prop_object_release(udev_enum->ev_filt);
while (!TAILQ_EMPTY(&udev_enum->list_entries)) {
le = TAILQ_FIRST(&udev_enum->list_entries);
TAILQ_REMOVE(&udev_enum->list_entries, le, link);
prop_object_release(le->dict);
free(le);
}
udev_unref(udev_enum->udev_ctx);
free(udev_enum);
}
}
struct udev *
udev_enumerate_get_udev(struct udev_enumerate *udev_enum)
{
return udev_enum->udev_ctx;
}
int
udev_enumerate_scan_devices(struct udev_enumerate *udev_enum)
{
prop_array_t pa;
if (udev_get_fd(udev_enum->udev_ctx) == -1)
return -1;
pa = udevd_request_devs(udev_get_fd(udev_enum->udev_ctx), udev_enum->ev_filt);
if (pa == NULL)
return -1;
prop_object_retain(pa);
if (udev_enum->pa != NULL)
prop_object_release(udev_enum->pa);
udev_enum->pa = pa;
return 0;
}
struct udev_list_entry *
udev_enumerate_get_list_entry(struct udev_enumerate *udev_enum)
{
struct udev_list_entry *le;
prop_object_iterator_t iter;
prop_dictionary_t dict;
/* If the list is not empty, assume it was populated in an earlier call */
if (!TAILQ_EMPTY(&udev_enum->list_entries))
return TAILQ_FIRST(&udev_enum->list_entries);
iter = prop_array_iterator(udev_enum->pa);
if (iter == NULL)
return NULL;
while ((dict = prop_object_iterator_next(iter)) != NULL) {
le = malloc(sizeof(struct udev_list_entry));
if (le == NULL)
goto out;
prop_object_retain(dict);
le->dict = dict;
le->udev_ctx = udev_enum->udev_ctx;
TAILQ_INSERT_TAIL(&udev_enum->list_entries, le, link);
}
le = TAILQ_FIRST(&udev_enum->list_entries);
out:
prop_object_iterator_release(iter);
return le;
}
prop_array_t
udev_enumerate_get_array(struct udev_enumerate *udev_enum)
{
return udev_enum->pa;
}
struct udev_list_entry *
udev_list_entry_get_next(struct udev_list_entry *list_entry)
{
return TAILQ_NEXT(list_entry, link);
}
prop_dictionary_t
udev_list_entry_get_dictionary(struct udev_list_entry *list_entry)
{
return list_entry->dict;
}
struct udev_device *
udev_list_entry_get_device(struct udev_list_entry *list_entry)
{
struct udev_device *udev_dev;
udev_dev = udev_device_new_from_dictionary(list_entry->udev_ctx,
list_entry->dict);
return udev_dev;
}
int
udev_enumerate_add_match_subsystem(struct udev_enumerate *udev_enum,
const char *subsystem)
{
int ret;
ret = _udev_enumerate_filter_add_match_gen(udev_enum,
EVENT_FILTER_TYPE_WILDCARD,
0,
"subsystem",
__DECONST(char *, subsystem));
return ret;
}
int
udev_enumerate_add_nomatch_subsystem(struct udev_enumerate *udev_enum,
const char *subsystem)
{
int ret;
ret = _udev_enumerate_filter_add_match_gen(udev_enum,
EVENT_FILTER_TYPE_WILDCARD,
1,
"subsystem",
__DECONST(char *, subsystem));
return ret;
}
int
udev_enumerate_add_match_expr(struct udev_enumerate *udev_enum,
const char *key,
char *expr)
{
int ret;
ret = _udev_enumerate_filter_add_match_gen(udev_enum,
EVENT_FILTER_TYPE_WILDCARD,
0,
key,
expr);
return ret;
}
int
udev_enumerate_add_nomatch_expr(struct udev_enumerate *udev_enum,
const char *key,
char *expr)
{
int ret;
ret = _udev_enumerate_filter_add_match_gen(udev_enum,
EVENT_FILTER_TYPE_WILDCARD,
1,
key,
expr);
return ret;
}
int
udev_enumerate_add_match_regex(struct udev_enumerate *udev_enum,
const char *key,
char *expr)
{
int ret;
ret = _udev_enumerate_filter_add_match_gen(udev_enum,
EVENT_FILTER_TYPE_REGEX,
0,
key,
expr);
return ret;
}
int
udev_enumerate_add_nomatch_regex(struct udev_enumerate *udev_enum,
const char *key,
char *expr)
{
int ret;
ret = _udev_enumerate_filter_add_match_gen(udev_enum,
EVENT_FILTER_TYPE_REGEX,
1,
key,
expr);
return ret;
}
int
_udev_enumerate_filter_add_match_gen(struct udev_enumerate *udev_enum,
int type,
int neg,
const char *key,
char *expr)
{
prop_array_t pa;
int error;
if (udev_enum->ev_filt == NULL) {
pa = prop_array_create_with_capacity(5);
if (pa == NULL)
return -1;
udev_enum->ev_filt = pa;
}
error = _udev_filter_add_match_gen(udev_enum->ev_filt, type, neg, key, expr);
return error;
}