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/*
Check the mutex lock information in tdb database
Copyright (C) Amitay Isaacs 2015-2021
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
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.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <pthread.h>
#include <errno.h>
#ifndef USE_TDB_MUTEX_LOCKING
#define USE_TDB_MUTEX_LOCKING 1
#endif
#include "lib/tdb/common/tdb_private.h"
#include "lib/tdb/common/mutex.c"
static uint8_t *hex_decode(const char *hex_in, size_t *plen)
{
size_t i;
int num;
uint8_t *buffer;
size_t len;
len = strlen(hex_in) / 2;
if (len == 0) {
return NULL;
}
buffer = malloc(len);
if (buffer == NULL) {
return NULL;
}
for (i = 0; i < len; i++) {
sscanf(&hex_in[i*2], "%02X", &num);
buffer[i] = (uint8_t)num;
}
*plen = len;
return buffer;
}
static int get_hash_chain(struct tdb_context *tdb, const char *hex_key)
{
TDB_DATA key = {
.dsize = 0,
};
unsigned int hash;
key.dptr = hex_decode(hex_key, &key.dsize);
if (key.dptr == NULL || key.dsize == 0) {
return -1;
}
hash = tdb_jenkins_hash(&key);
free(key.dptr);
return hash % tdb_hash_size(tdb);
}
static void check_one(struct tdb_mutexes *mutexes, int chain)
{
pthread_mutex_t *m;
int ret;
int pthread_mutex_consistent_np(pthread_mutex_t *);
m = &mutexes->hashchains[chain+1];
ret = pthread_mutex_trylock(m);
if (ret == 0) {
pthread_mutex_unlock(m);
return;
}
if (ret == EOWNERDEAD) {
ret = pthread_mutex_consistent_np(m);
if (ret != 0) {
printf("[%6d] consistent failed (%d)\n", chain, ret);
return;
}
ret = pthread_mutex_unlock(m);
if (ret != 0) {
printf("[%6d] unlock failed (%d)\n", chain, ret);
return;
}
printf("[%6d] cleaned\n", chain);
return;
}
if (ret == EBUSY) {
printf("[%6d] pid=%d\n", chain, m->__data.__owner);
return;
}
printf("[%6d] trylock failed (%d)\n", chain, ret);
}
static void check_all(struct tdb_mutexes *mutexes, unsigned int hash_size)
{
unsigned int i;
for (i=0; i<hash_size; i++) {
check_one(mutexes, i);
}
}
int main(int argc, char **argv)
{
const char *tdb_file;
TDB_CONTEXT *tdb;
uint32_t tdb_flags;
int chain, i;
if (argc < 2) {
printf("Usage %s <tdb file> [<key1> <key2>]\n", argv[0]);
exit(1);
}
tdb_file = argv[1];
tdb_flags = TDB_MUTEX_LOCKING | TDB_INCOMPATIBLE_HASH |
TDB_CLEAR_IF_FIRST;
tdb = tdb_open(tdb_file, 0, tdb_flags, O_RDWR, 0);
if (tdb == NULL) {
printf("Error opening %s\n", tdb_file);
exit(1);
}
if (tdb->mutexes == NULL) {
printf("Mutexes are not mmapped\n");
exit(1);
}
if (argc == 2) {
check_all(tdb->mutexes, tdb_hash_size(tdb));
} else {
for (i=2; i<argc; i++) {
chain = get_hash_chain(tdb, argv[i]);
if (chain == -1) {
continue;
}
check_one(tdb->mutexes, chain);
}
}
tdb_close(tdb);
return 0;
}
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