71 lines
1.5 KiB
C
71 lines
1.5 KiB
C
/*
|
|
* Copyright (C) 2011 Felix Fietkau <nbd@openwrt.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU Lesser General Public License version 2.1
|
|
* as published by the Free Software Foundation
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <libubox/avl-cmp.h>
|
|
|
|
#include "ubusmsg.h"
|
|
#include "ubusd_id.h"
|
|
|
|
static int random_fd = -1;
|
|
|
|
static int ubus_cmp_id(const void *k1, const void *k2, void *ptr)
|
|
{
|
|
const uint32_t *id1 = k1, *id2 = k2;
|
|
|
|
if (*id1 < *id2)
|
|
return -1;
|
|
else
|
|
return *id1 > *id2;
|
|
}
|
|
|
|
void ubus_init_string_tree(struct avl_tree *tree, bool dup)
|
|
{
|
|
avl_init(tree, avl_strcmp, dup, NULL);
|
|
}
|
|
|
|
void ubus_init_id_tree(struct avl_tree *tree)
|
|
{
|
|
if (random_fd < 0) {
|
|
random_fd = open("/dev/urandom", O_RDONLY);
|
|
if (random_fd < 0) {
|
|
perror("open");
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
avl_init(tree, ubus_cmp_id, false, NULL);
|
|
}
|
|
|
|
bool ubus_alloc_id(struct avl_tree *tree, struct ubus_id *id, uint32_t val)
|
|
{
|
|
id->avl.key = &id->id;
|
|
if (val) {
|
|
id->id = val;
|
|
return avl_insert(tree, &id->avl) == 0;
|
|
}
|
|
|
|
do {
|
|
if (read(random_fd, &id->id, sizeof(id->id)) != sizeof(id->id))
|
|
return false;
|
|
|
|
if (id->id < UBUS_SYSTEM_OBJECT_MAX)
|
|
continue;
|
|
} while (avl_insert(tree, &id->avl) != 0);
|
|
|
|
return true;
|
|
}
|
|
|