ckpool/src/libckpool.h

/*
 * Copyright 2014 Con Kolivas
 *
 * 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.  See COPYING for more details.
 */

/* This file should contain all exported functions of libckpool */

#ifndef LIBCKPOOL_H
#define LIBCKPOOL_H

#include <errno.h>
#include <jansson.h>
#include <netdb.h>
#include <pthread.h>
#include <signal.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <syslog.h>
#include <semaphore.h>

#if HAVE_BYTESWAP_H
# include <byteswap.h>
#endif

#if HAVE_ENDIAN_H
# include <endian.h>
#elif HAVE_SYS_ENDIAN_H
# include <sys/endian.h>
#endif

#include <sys/socket.h>
#include <sys/types.h>

#include "utlist.h"

#ifndef bswap_16
 #define bswap_16 __builtin_bswap16
 #define bswap_32 __builtin_bswap32
 #define bswap_64 __builtin_bswap64
#endif

/* This assumes htobe32 is a macro in endian.h, and if it doesn't exist, then
 * htobe64 also won't exist */
#ifndef htobe32
# if __BYTE_ORDER == __LITTLE_ENDIAN
#  define htole16(x) (x)
#  define le16toh(x) (x)
#  define htole32(x) (x)
#  define htole64(x) (x)
#  define le32toh(x) (x)
#  define le64toh(x) (x)
#  define be32toh(x) bswap_32(x)
#  define be64toh(x) bswap_64(x)
#  define htobe16(x) bswap_16(x)
#  define htobe32(x) bswap_32(x)
#  define htobe64(x) bswap_64(x)
# elif __BYTE_ORDER == __BIG_ENDIAN
#  define htole16(x) bswap_16(x)
#  define le16toh(x) bswap_16(x)
#  define htole32(x) bswap_32(x)
#  define le32toh(x) bswap_32(x)
#  define le64toh(x) bswap_64(x)
#  define htole64(x) bswap_64(x)
#  define be32toh(x) (x)
#  define be64toh(x) (x)
#  define htobe16(x) (x)
#  define htobe32(x) (x)
#  define htobe64(x) (x)
# endif
#endif

#define unlikely(expr) (__builtin_expect(!!(expr), 0))
#define likely(expr) (__builtin_expect(!!(expr), 1))
#define __maybe_unused		__attribute__((unused))
#define uninitialised_var(x) x = x

#define MAX(a,b) \
	({ __typeof__ (a) _a = (a); \
	__typeof__ (b) _b = (b); \
	_a > _b ? _a : _b; })

#define MIN(a,b) \
	({ __typeof__ (a) _a = (a); \
	__typeof__ (b) _b = (b); \
	_a < _b ? _a : _b; })

typedef unsigned char uchar;

typedef struct timeval tv_t;
typedef struct timespec ts_t;

static inline void swap_256(void *dest_p, const void *src_p)
{
	uint32_t *dest = dest_p;
	const uint32_t *src = src_p;

	dest[0] = src[7];
	dest[1] = src[6];
	dest[2] = src[5];
	dest[3] = src[4];
	dest[4] = src[3];
	dest[5] = src[2];
	dest[6] = src[1];
	dest[7] = src[0];
}

static inline void bswap_256(void *dest_p, const void *src_p)
{
	uint32_t *dest = dest_p;
	const uint32_t *src = src_p;

	dest[0] = bswap_32(src[7]);
	dest[1] = bswap_32(src[6]);
	dest[2] = bswap_32(src[5]);
	dest[3] = bswap_32(src[4]);
	dest[4] = bswap_32(src[3]);
	dest[5] = bswap_32(src[2]);
	dest[6] = bswap_32(src[1]);
	dest[7] = bswap_32(src[0]);
}

static inline void flip_32(void *dest_p, const void *src_p)
{
	uint32_t *dest = dest_p;
	const uint32_t *src = src_p;
	int i;

	for (i = 0; i < 8; i++)
		dest[i] = bswap_32(src[i]);
}

static inline void flip_80(void *dest_p, const void *src_p)
{
	uint32_t *dest = dest_p;
	const uint32_t *src = src_p;
	int i;

	for (i = 0; i < 20; i++)
		dest[i] = bswap_32(src[i]);
}

#define mutex_lock(_lock) _mutex_lock(_lock, __FILE__, __func__, __LINE__)
#define mutex_unlock_noyield(_lock) _mutex_unlock_noyield(_lock, __FILE__, __func__, __LINE__)
#define mutex_unlock(_lock) _mutex_unlock(_lock, __FILE__, __func__, __LINE__)
#define mutex_trylock(_lock) _mutex_trylock(_lock, __FILE__, __func__, __LINE__)
#define mutex_timedlock(_lock, timeout) _mutex_timedlock(_lock, timeout, __FILE__, __func__, __LINE__)
#define wr_lock(_lock) _wr_lock(_lock, __FILE__, __func__, __LINE__)
#define wr_trylock(_lock) _wr_trylock(_lock, __FILE__, __func__, __LINE__)
#define rd_lock(_lock) _rd_lock(_lock, __FILE__, __func__, __LINE__)
#define rw_unlock(_lock) _rw_unlock(_lock, __FILE__, __func__, __LINE__)
#define rd_unlock_noyield(_lock) _rd_unlock_noyield(_lock, __FILE__, __func__, __LINE__)
#define wr_unlock_noyield(_lock) _wr_unlock_noyield(_lock, __FILE__, __func__, __LINE__)
#define rd_unlock(_lock) _rd_unlock(_lock, __FILE__, __func__, __LINE__)
#define wr_unlock(_lock) _wr_unlock(_lock, __FILE__, __func__, __LINE__)
#define mutex_init(_lock) _mutex_init(_lock, __FILE__, __func__, __LINE__)
#define rwlock_init(_lock) _rwlock_init(_lock, __FILE__, __func__, __LINE__)
#define cond_init(_cond) _cond_init(_cond, __FILE__, __func__, __LINE__)

#define cklock_init(_lock) _cklock_init(_lock, __FILE__, __func__, __LINE__)
#define ck_rlock(_lock) _ck_rlock(_lock, __FILE__, __func__, __LINE__)
#define ck_ilock(_lock) _ck_ilock(_lock, __FILE__, __func__, __LINE__)
#define ck_uilock(_lock) _ck_uilock(_lock, __FILE__, __func__, __LINE__)
#define ck_ulock(_lock) _ck_ulock(_lock, __FILE__, __func__, __LINE__)
#define ck_wlock(_lock) _ck_wlock(_lock, __FILE__, __func__, __LINE__)
#define ck_dwlock(_lock) _ck_dwlock(_lock, __FILE__, __func__, __LINE__)
#define ck_dwilock(_lock) _ck_dwilock(_lock, __FILE__, __func__, __LINE__)
#define ck_dlock(_lock) _ck_dlock(_lock, __FILE__, __func__, __LINE__)
#define ck_runlock(_lock) _ck_runlock(_lock, __FILE__, __func__, __LINE__)
#define ck_wunlock(_lock) _ck_wunlock(_lock, __FILE__, __func__, __LINE__)

#define ckalloc(len) _ckalloc(len, __FILE__, __func__, __LINE__)
#define ckzalloc(len) _ckzalloc(len, __FILE__, __func__, __LINE__)

#define dealloc(ptr) _dealloc((void *)&(ptr))

#define VASPRINTF(strp, fmt, ...) do { \
	if (unlikely(vasprintf(strp, fmt, ##__VA_ARGS__) < 0)) \
		quitfrom(1, __FILE__, __func__, __LINE__, "Failed to asprintf"); \
} while (0)

#define ASPRINTF(strp, fmt, ...) do { \
	if (unlikely(asprintf(strp, fmt, ##__VA_ARGS__) < 0)) \
		quitfrom(1, __FILE__, __func__, __LINE__, "Failed to asprintf"); \
} while (0)

void logmsg(int loglevel, const char *fmt, ...);

#define DEFLOGBUFSIZ 512

#define LOGMSGSIZ(__siz, __lvl, __fmt, ...) do { \
		char tmp42[__siz]; \
		snprintf(tmp42, sizeof(tmp42), __fmt, ##__VA_ARGS__); \
		logmsg(__lvl, "%s", tmp42); \
	} while(0)

#define LOGMSG(_lvl, _fmt, ...) \
	LOGMSGSIZ(DEFLOGBUFSIZ, _lvl, _fmt, ##__VA_ARGS__)

#define LOGEMERG(fmt, ...) LOGMSG(LOG_EMERG, fmt, ##__VA_ARGS__)
#define LOGALERT(fmt, ...) LOGMSG(LOG_ALERT, fmt, ##__VA_ARGS__)
#define LOGCRIT(fmt, ...) LOGMSG(LOG_CRIT, fmt, ##__VA_ARGS__)
#define LOGERR(fmt, ...) LOGMSG(LOG_ERR, fmt, ##__VA_ARGS__)
#define LOGWARNING(fmt, ...) LOGMSG(LOG_WARNING, fmt, ##__VA_ARGS__)
#define LOGNOTICE(fmt, ...) LOGMSG(LOG_NOTICE, fmt, ##__VA_ARGS__)
#define LOGINFO(fmt, ...) LOGMSG(LOG_INFO, fmt, ##__VA_ARGS__)
#define LOGDEBUG(fmt, ...) LOGMSG(LOG_DEBUG, fmt, ##__VA_ARGS__)

#define IN_FMT_FFL " in %s %s():%d"
#define quitfrom(status, _file, _func, _line, fmt, ...) do { \
	if (fmt) { \
		fprintf(stderr, fmt IN_FMT_FFL, ##__VA_ARGS__, _file, _func, _line); \
		fprintf(stderr, "\n"); \
		fflush(stderr); \
	} \
	exit(status); \
} while (0)

#define quit(status, fmt, ...) do { \
	if (fmt) { \
		fprintf(stderr, fmt, ##__VA_ARGS__); \
		fprintf(stderr, "\n"); \
		fflush(stderr); \
	} \
	exit(status); \
} while (0)

#define PAGESIZE (4096)

/* Share error values */

enum share_err {
	SE_INVALID_NONCE2 = -9,
	SE_WORKER_MISMATCH,
	SE_NO_NONCE,
	SE_NO_NTIME,
	SE_NO_NONCE2,
	SE_NO_JOBID,
	SE_NO_USERNAME,
	SE_INVALID_SIZE,
	SE_NOT_ARRAY,
	SE_NONE, // 0
	SE_INVALID_JOBID,
	SE_STALE,
	SE_NTIME_INVALID,
	SE_DUPE,
	SE_HIGH_DIFF
};

static const char __maybe_unused *share_errs[] = {
	"Invalid nonce2 length",
	"Worker mismatch",
	"No nonce",
	"No ntime",
	"No nonce2",
	"No job_id",
	"No username",
	"Invalid array size",
	"Params not array",
	"Valid",
	"Invalid JobID",
	"Stale",
	"Ntime out of range",
	"Duplicate",
	"Above target"
};

#define SHARE_ERR(x) share_errs[((x) + 9)]

/* ck locks, a write biased variant of rwlocks */
struct cklock {
	pthread_mutex_t mutex;
	pthread_rwlock_t rwlock;
};

typedef struct cklock cklock_t;

struct unixsock {
	int sockd;
	char *path;
};

typedef struct unixsock unixsock_t;

typedef struct proc_instance proc_instance_t;


void _json_check(json_t *val, json_error_t *err, const char *file, const char *func, const int line);
#define json_check(VAL, ERR) _json_check(VAL, ERR,  __FILE__, __func__, __LINE__)

/* Check and pack json */
#define JSON_CPACK(VAL, ...) do { \
	json_error_t ERR; \
	VAL = json_pack_ex(&ERR, 0, ##__VA_ARGS__); \
	json_check(VAL, &ERR); \
} while (0)

/* No error checking with these, make sure we know they're valid already! */
static inline void json_strcpy(char *buf, json_t *val, const char *key)
{
	strcpy(buf, json_string_value(json_object_get(val, key)));
}

static inline void json_dblcpy(double *dbl, json_t *val, const char *key)
{
	*dbl = json_real_value(json_object_get(val, key));
}

static inline void json_uintcpy(uint32_t *u32, json_t *val, const char *key)
{
	*u32 = (uint32_t)json_integer_value(json_object_get(val, key));
}

static inline void json_uint64cpy(uint64_t *u64, json_t *val, const char *key)
{
	*u64 = (uint64_t)json_integer_value(json_object_get(val, key));
}

static inline void json_int64cpy(int64_t *i64, json_t *val, const char *key)
{
	*i64 = (int64_t)json_integer_value(json_object_get(val, key));
}

static inline void json_intcpy(int *i, json_t *val, const char *key)
{
	*i = json_integer_value(json_object_get(val, key));
}

static inline void json_strdup(char **buf, json_t *val, const char *key)
{
	*buf = strdup(json_string_value(json_object_get(val, key)));
}

/* Helpers for setting a field will check for valid entry and print an error
 * if it is unsuccessfully set. */
static inline void _json_set_string(json_t *val, const char *key, const char *str,
				    const char *file, const char *func, const int line)
{
	if (unlikely(json_object_set_new_nocheck(val, key, json_string(str))))
		LOGERR("Failed to set json string from %s %s:%d", file, func, line);
}
#define json_set_string(val, key, str) _json_set_string(val, key, str, __FILE__, __func__, __LINE__)

static inline void _json_set_int(json_t *val, const char *key, int64_t integer,
				 const char *file, const char *func, const int line)
{
	if (unlikely(json_object_set_new_nocheck(val, key, json_integer(integer))))
		LOGERR("Failed to set json int from %s %s:%d", file, func, line);
}
#define json_set_int(val, key, integer) _json_set_int(val, key, integer, __FILE__, __func__, __LINE__)

static inline void _json_set_double(json_t *val, const char *key, double real,
				    const char *file, const char *func, const int line)
{
	if (unlikely(json_object_set_new_nocheck(val, key, json_real(real))))
		LOGERR("Failed to set json double from %s %s:%d", file, func, line);
}
#define json_set_double(val, key, real) _json_set_double(val, key, real, __FILE__, __func__, __LINE__)

static inline void _json_set_bool(json_t *val, const char *key, bool boolean,
				  const char *file, const char *func, const int line)
{
	if (unlikely(json_object_set_new_nocheck(val, key, json_boolean(boolean))))
		LOGERR("Failed to set json bool from %s %s:%d", file, func, line);
}
#define json_set_bool(val, key, boolean) _json_set_bool(val, key, boolean, __FILE__, __func__, __LINE__)

void rename_proc(const char *name);
void create_pthread(pthread_t *thread, void *(*start_routine)(void *), void *arg);
void join_pthread(pthread_t thread);
bool ck_completion_timeout(void *fn, void *fnarg, int timeout);

void _mutex_lock(pthread_mutex_t *lock, const char *file, const char *func, const int line);
void _mutex_unlock_noyield(pthread_mutex_t *lock, const char *file, const char *func, const int line);
void _mutex_unlock(pthread_mutex_t *lock, const char *file, const char *func, const int line);
int _mutex_trylock(pthread_mutex_t *lock, __maybe_unused const char *file, __maybe_unused const char *func, __maybe_unused const int line);
int _mutex_timedlock(pthread_mutex_t *lock, int timeout, __maybe_unused const char *file, __maybe_unused const char *func, __maybe_unused const int line);
void _wr_lock(pthread_rwlock_t *lock, const char *file, const char *func, const int line);
int _wr_trylock(pthread_rwlock_t *lock, __maybe_unused const char *file, __maybe_unused const char *func, __maybe_unused const int line);
void _rd_lock(pthread_rwlock_t *lock, const char *file, const char *func, const int line);
void _rw_unlock(pthread_rwlock_t *lock, const char *file, const char *func, const int line);
void _rd_unlock_noyield(pthread_rwlock_t *lock, const char *file, const char *func, const int line);
void _wr_unlock_noyield(pthread_rwlock_t *lock, const char *file, const char *func, const int line);
void _rd_unlock(pthread_rwlock_t *lock, const char *file, const char *func, const int line);
void _wr_unlock(pthread_rwlock_t *lock, const char *file, const char *func, const int line);
void _mutex_init(pthread_mutex_t *lock, const char *file, const char *func, const int line);
void mutex_destroy(pthread_mutex_t *lock);
void _rwlock_init(pthread_rwlock_t *lock, const char *file, const char *func, const int line);
void rwlock_destroy(pthread_rwlock_t *lock);
void _cond_init(pthread_cond_t *cond, const char *file, const char *func, const int line);

void _cklock_init(cklock_t *lock, const char *file, const char *func, const int line);
void cklock_destroy(cklock_t *lock);
void _ck_rlock(cklock_t *lock, const char *file, const char *func, const int line);
void _ck_ilock(cklock_t *lock, const char *file, const char *func, const int line);
void _ck_uilock(cklock_t *lock, const char *file, const char *func, const int line);
void _ck_ulock(cklock_t *lock, const char *file, const char *func, const int line);
void _ck_wlock(cklock_t *lock, const char *file, const char *func, const int line);
void _ck_dwlock(cklock_t *lock, const char *file, const char *func, const int line);
void _ck_dwilock(cklock_t *lock, const char *file, const char *func, const int line);
void _ck_dlock(cklock_t *lock, const char *file, const char *func, const int line);
void _ck_runlock(cklock_t *lock, const char *file, const char *func, const int line);
void _ck_wunlock(cklock_t *lock, const char *file, const char *func, const int line);

void _cksem_init(sem_t *sem, const char *file, const char *func, const int line);
void _cksem_post(sem_t *sem, const char *file, const char *func, const int line);
void _cksem_wait(sem_t *sem, const char *file, const char *func, const int line);
int _cksem_mswait(sem_t *sem, int ms, const char *file, const char *func, const int line);
void _cksem_destroy(sem_t *sem, const char *file, const char *func, const int line);

#define cksem_init(SEM) _cksem_init(SEM, __FILE__, __func__, __LINE__)
#define cksem_post(SEM) _cksem_post(SEM, __FILE__, __func__, __LINE__)
#define cksem_wait(SEM) _cksem_wait(SEM, __FILE__, __func__, __LINE__)
#define cksem_mswait(SEM, _timeout) _cksem_mswait(SEM, _timeout, __FILE__, __func__, __LINE__)
#define cksem_destroy(SEM) _cksem_destroy(SEM, __FILE__, __func__, __LINE__)

static inline bool sock_connecting(void)
{
	return errno == EINPROGRESS;
}

static inline bool sock_blocks(void)
{
	return (errno == EAGAIN || errno == EWOULDBLOCK);
}

static inline bool sock_timeout(void)
{
	return (errno == ETIMEDOUT);
}

bool extract_sockaddr(char *url, char **sockaddr_url, char **sockaddr_port);
bool url_from_sockaddr(const struct sockaddr *addr, char *url, char *port);
bool addrinfo_from_url(const char *url, const char *port, struct addrinfo *addrinfo);
bool url_from_serverurl(char *serverurl, char *newurl, char *newport);
bool url_from_socket(const int sockd, char *url, char *port);

void keep_sockalive(int fd);
void nolinger_socket(int fd);
void noblock_socket(int fd);
void block_socket(int fd);
void _close(int *fd, const char *file, const char *func, const int line);
#define _Close(FD) _close(FD, __FILE__, __func__, __LINE__)
#define Close(FD) _close(&FD, __FILE__, __func__, __LINE__)
int bind_socket(char *url, char *port);
int connect_socket(char *url, char *port);
int write_socket(int fd, const void *buf, size_t nbyte);
void empty_socket(int fd);
void _close_unix_socket(int *sockd, const char *server_path);
#define close_unix_socket(sockd, server_path) _close_unix_socket(&sockd, server_path)
int _open_unix_server(const char *server_path, const char *file, const char *func, const int line);
#define open_unix_server(server_path) _open_unix_server(server_path, __FILE__, __func__, __LINE__)
int _open_unix_client(const char *server_path, const char *file, const char *func, const int line);
#define open_unix_client(server_path) _open_unix_client(server_path, __FILE__, __func__, __LINE__)
int wait_read_select(int sockd, int timeout);
int read_length(int sockd, void *buf, int len);
char *_recv_unix_msg(int sockd, int timeout1, int timeout2, const char *file, const char *func, const int line);
#define RECV_UNIX_TIMEOUT1 30
#define RECV_UNIX_TIMEOUT2 5
#define recv_unix_msg(sockd) _recv_unix_msg(sockd, RECV_UNIX_TIMEOUT1, RECV_UNIX_TIMEOUT2, __FILE__, __func__, __LINE__)
#define recv_unix_msg_tmo(sockd, tmo) _recv_unix_msg(sockd, tmo, RECV_UNIX_TIMEOUT2, __FILE__, __func__, __LINE__)
#define recv_unix_msg_tmo2(sockd, tmo1, tmo2) _recv_unix_msg(sockd, tmo1, tmo2, __FILE__, __func__, __LINE__)
int wait_write_select(int sockd, int timeout);
int write_length(int sockd, const void *buf, int len);
bool _send_unix_msg(int sockd, const char *buf, const char *file, const char *func, const int line);
#define send_unix_msg(sockd, buf) _send_unix_msg(sockd, buf, __FILE__, __func__, __LINE__)
bool _send_unix_data(int sockd, const struct msghdr *msg, const char *file, const char *func, const int line);
#define send_unix_data(sockd, msg) _send_unix_data(sockd, msg, __FILE__, __func__, __LINE__)
bool _recv_unix_data(int sockd, struct msghdr *msg, const char *file, const char *func, const int line);
#define recv_unix_data(sockd, msg) _recv_unix_data(sockd, msg, __FILE__, __func__, __LINE__)
bool _send_fd(int fd, int sockd, const char *file, const char *func, const int line);
#define send_fd(fd, sockd) _send_fd(fd, sockd, __FILE__, __func__, __LINE__)
int _get_fd(int sockd, const char *file, const char *func, const int line);
#define get_fd(sockd) _get_fd(sockd, __FILE__, __func__, __LINE__)

const char *__json_array_string(json_t *val, unsigned int entry);
char *json_array_string(json_t *val, unsigned int entry);
json_t *json_object_dup(json_t *val, const char *entry);

char *rotating_filename(const char *path, time_t when);
bool rotating_log(const char *path, const char *msg);

void align_len(size_t *len);
void realloc_strcat(char **ptr, const char *s);
void trail_slash(char **buf);
void *_ckalloc(size_t len, const char *file, const char *func, const int line);
void *json_ckalloc(size_t size);
void *_ckzalloc(size_t len, const char *file, const char *func, const int line);
void _dealloc(void **ptr);
extern const int hex2bin_tbl[];
void __bin2hex(void *vs, const void *vp, size_t len);
void *bin2hex(const void *vp, size_t len);
bool _hex2bin(void *p, const void *vhexstr, size_t len, const char *file, const char *func, const int line);
#define hex2bin(p, vhexstr, len) _hex2bin(p, vhexstr, len, __FILE__, __func__, __LINE__)
char *http_base64(const char *src);
void b58tobin(char *b58bin, const char *b58);
int safecmp(const char *a, const char *b);
bool cmdmatch(const char *buf, const char *cmd);

void address_to_pubkeytxn(char *pkh, const char *addr);
int ser_number(uchar *s, int32_t val);
int get_sernumber(uchar *s);
bool fulltest(const uchar *hash, const uchar *target);

void copy_tv(tv_t *dest, const tv_t *src);
void ts_to_tv(tv_t *val, const ts_t *spec);
void tv_to_ts(ts_t *spec, const tv_t *val);
void us_to_tv(tv_t *val, int64_t us);
void us_to_ts(ts_t *spec, int64_t us);
void ms_to_ts(ts_t *spec, int64_t ms);
void ms_to_tv(tv_t *val, int64_t ms);
void tv_time(tv_t *tv);
void ts_realtime(ts_t *ts);

void cksleep_prepare_r(ts_t *ts);
void nanosleep_abstime(ts_t *ts_end);
void timeraddspec(ts_t *a, const ts_t *b);
void cksleep_ms_r(ts_t *ts_start, int ms);
void cksleep_us_r(ts_t *ts_start, int64_t us);
void cksleep_ms(int ms);
void cksleep_us(int64_t us);

double us_tvdiff(tv_t *end, tv_t *start);
int ms_tvdiff(tv_t *end, tv_t *start);
double tvdiff(tv_t *end, tv_t *start);

void decay_time(double *f, double fadd, double fsecs, double interval);
void suffix_string(double val, char *buf, size_t bufsiz, int sigdigits);

double le256todouble(const uchar *target);
double diff_from_target(uchar *target);
double diff_from_nbits(char *nbits);
void target_from_diff(uchar *target, double diff);

void gen_hash(uchar *data, uchar *hash, int len);

#endif /* LIBCKPOOL_H */