zmq.h

/*
    Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file

    This file is part of libzmq, the ZeroMQ core engine in C++.

    libzmq is free software; you can redistribute it and/or modify it under
    the terms of the GNU Lesser General Public License (LGPL) as published
    by the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    As a special exception, the Contributors give you permission to link
    this library with independent modules to produce an executable,
    regardless of the license terms of these independent modules, and to
    copy and distribute the resulting executable under terms of your choice,
    provided that you also meet, for each linked independent module, the
    terms and conditions of the license of that module. An independent
    module is a module which is not derived from or based on this library.
    If you modify this library, you must extend this exception to your
    version of the library.

    libzmq 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 Lesser General Public
    License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

    *************************************************************************
    NOTE to contributors. This file comprises the principal public contract
    for ZeroMQ API users. Any change to this file supplied in a stable
    release SHOULD not break existing applications.
    In practice this means that the value of constants must not change, and
    that old values may not be reused for new constants.
    *************************************************************************
*/

#ifndef __ZMQ_H_INCLUDED__
#define __ZMQ_H_INCLUDED__

/*  Version macros for compile-time API version detection                     */
#define ZMQ_VERSION_MAJOR 4
#define ZMQ_VERSION_MINOR 3
#define ZMQ_VERSION_PATCH 4

#define ZMQ_MAKE_VERSION(major, minor, patch)                                  \
    ((major) *10000 + (minor) *100 + (patch))
#define ZMQ_VERSION                                                            \
    ZMQ_MAKE_VERSION (ZMQ_VERSION_MAJOR, ZMQ_VERSION_MINOR, ZMQ_VERSION_PATCH)

#ifdef __cplusplus
extern "C" {
#endif

#if !defined _WIN32_WCE
#include <errno.h>
#endif
#include <stddef.h>
#include <stdio.h>
#if defined _WIN32
//  Set target version to Windows Server 2008, Windows Vista or higher.
//  Windows XP (0x0501) is supported but without client & server socket types.
#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0600
#endif

#ifdef __MINGW32__
//  Require Windows XP or higher with MinGW for getaddrinfo().
#if (_WIN32_WINNT >= 0x0501)
#else
#error You need at least Windows XP target
#endif
#endif
#endif

/*  Handle DSO symbol visibility                                             */
#if defined _WIN32
#if defined ZMQ_STATIC
#define ZMQ_EXPORT
#elif defined DLL_EXPORT
#define ZMQ_EXPORT __declspec(dllexport)
#else
#define ZMQ_EXPORT __declspec(dllimport)
#endif
#else
#if defined __SUNPRO_C || defined __SUNPRO_CC
#define ZMQ_EXPORT __global
#elif (defined __GNUC__ && __GNUC__ >= 4) || defined __INTEL_COMPILER
#define ZMQ_EXPORT __attribute__ ((visibility ("default")))
#else
#define ZMQ_EXPORT
#endif
#endif

/*  Define integer types needed for event interface                          */
#define ZMQ_DEFINED_STDINT 1
#if defined ZMQ_HAVE_SOLARIS || defined ZMQ_HAVE_OPENVMS
#include <inttypes.h>
#elif defined _MSC_VER && _MSC_VER < 1600
#ifndef uint64_t
typedef unsigned __int64 uint64_t;
#endif
#ifndef int32_t
typedef __int32 int32_t;
#endif
#ifndef uint32_t
typedef unsigned __int32 uint32_t;
#endif
#ifndef uint16_t
typedef unsigned __int16 uint16_t;
#endif
#ifndef uint8_t
typedef unsigned __int8 uint8_t;
#endif
#else
#include <stdint.h>
#endif

//  32-bit AIX's pollfd struct members are called reqevents and rtnevents so it
//  defines compatibility macros for them. Need to include that header first to
//  stop build failures since zmq_pollset_t defines them as events and revents.
#ifdef ZMQ_HAVE_AIX
#include <poll.h>
#endif


/******************************************************************************/
/*  0MQ errors.                                                               */
/******************************************************************************/

/*  A number random enough not to collide with different errno ranges on      */
/*  different OSes. The assumption is that error_t is at least 32-bit type.   */
#define ZMQ_HAUSNUMERO 156384712

/*  On Windows platform some of the standard POSIX errnos are not defined.    */
#ifndef ENOTSUP
#define ENOTSUP (ZMQ_HAUSNUMERO + 1)
#endif
#ifndef EPROTONOSUPPORT
#define EPROTONOSUPPORT (ZMQ_HAUSNUMERO + 2)
#endif
#ifndef ENOBUFS
#define ENOBUFS (ZMQ_HAUSNUMERO + 3)
#endif
#ifndef ENETDOWN
#define ENETDOWN (ZMQ_HAUSNUMERO + 4)
#endif
#ifndef EADDRINUSE
#define EADDRINUSE (ZMQ_HAUSNUMERO + 5)
#endif
#ifndef EADDRNOTAVAIL
#define EADDRNOTAVAIL (ZMQ_HAUSNUMERO + 6)
#endif
#ifndef ECONNREFUSED
#define ECONNREFUSED (ZMQ_HAUSNUMERO + 7)
#endif
#ifndef EINPROGRESS
#define EINPROGRESS (ZMQ_HAUSNUMERO + 8)
#endif
#ifndef ENOTSOCK
#define ENOTSOCK (ZMQ_HAUSNUMERO + 9)
#endif
#ifndef EMSGSIZE
#define EMSGSIZE (ZMQ_HAUSNUMERO + 10)
#endif
#ifndef EAFNOSUPPORT
#define EAFNOSUPPORT (ZMQ_HAUSNUMERO + 11)
#endif
#ifndef ENETUNREACH
#define ENETUNREACH (ZMQ_HAUSNUMERO + 12)
#endif
#ifndef ECONNABORTED
#define ECONNABORTED (ZMQ_HAUSNUMERO + 13)
#endif
#ifndef ECONNRESET
#define ECONNRESET (ZMQ_HAUSNUMERO + 14)
#endif
#ifndef ENOTCONN
#define ENOTCONN (ZMQ_HAUSNUMERO + 15)
#endif
#ifndef ETIMEDOUT
#define ETIMEDOUT (ZMQ_HAUSNUMERO + 16)
#endif
#ifndef EHOSTUNREACH
#define EHOSTUNREACH (ZMQ_HAUSNUMERO + 17)
#endif
#ifndef ENETRESET
#define ENETRESET (ZMQ_HAUSNUMERO + 18)
#endif

/*  Native 0MQ error codes.                                                   */
#define EFSM (ZMQ_HAUSNUMERO + 51)
#define ENOCOMPATPROTO (ZMQ_HAUSNUMERO + 52)
#define ETERM (ZMQ_HAUSNUMERO + 53)
#define EMTHREAD (ZMQ_HAUSNUMERO + 54)

/*  This function retrieves the errno as it is known to 0MQ library. The goal */
/*  of this function is to make the code 100% portable, including where 0MQ   */
/*  compiled with certain CRT library (on Windows) is linked to an            */
/*  application that uses different CRT library.                              */
ZMQ_EXPORT int zmq_errno (void);

/*  Resolves system errors and 0MQ errors to human-readable string.           */
ZMQ_EXPORT const char *zmq_strerror (int errnum_);

/*  Run-time API version detection                                            */
ZMQ_EXPORT void zmq_version (int *major_, int *minor_, int *patch_);

/******************************************************************************/
/*  0MQ infrastructure (a.k.a. context) initialisation & termination.         */
/******************************************************************************/

/*  Context options                                                           */
#define ZMQ_IO_THREADS 1
#define ZMQ_MAX_SOCKETS 2
#define ZMQ_SOCKET_LIMIT 3
#define ZMQ_THREAD_PRIORITY 3
#define ZMQ_THREAD_SCHED_POLICY 4
#define ZMQ_MAX_MSGSZ 5
#define ZMQ_MSG_T_SIZE 6
#define ZMQ_THREAD_AFFINITY_CPU_ADD 7
#define ZMQ_THREAD_AFFINITY_CPU_REMOVE 8
#define ZMQ_THREAD_NAME_PREFIX 9

/*  Default for new contexts                                                  */
#define ZMQ_IO_THREADS_DFLT 1
#define ZMQ_MAX_SOCKETS_DFLT 1023
#define ZMQ_THREAD_PRIORITY_DFLT -1
#define ZMQ_THREAD_SCHED_POLICY_DFLT -1

ZMQ_EXPORT void *zmq_ctx_new (void);
ZMQ_EXPORT int zmq_ctx_term (void *context_);
ZMQ_EXPORT int zmq_ctx_shutdown (void *context_);
ZMQ_EXPORT int zmq_ctx_set (void *context_, int option_, int optval_);
ZMQ_EXPORT int zmq_ctx_get (void *context_, int option_);

/*  Old (legacy) API                                                          */
ZMQ_EXPORT void *zmq_init (int io_threads_);
ZMQ_EXPORT int zmq_term (void *context_);
ZMQ_EXPORT int zmq_ctx_destroy (void *context_);


/******************************************************************************/
/*  0MQ message definition.                                                   */
/******************************************************************************/

/* Some architectures, like sparc64 and some variants of aarch64, enforce pointer
 * alignment and raise sigbus on violations. Make sure applications allocate
 * zmq_msg_t on addresses aligned on a pointer-size boundary to avoid this issue.
 */
typedef struct zmq_msg_t
{
#if defined(_MSC_VER) && (defined(_M_X64) || defined(_M_ARM64))
    __declspec(align (8)) unsigned char _[64];
#elif defined(_MSC_VER)                                                        \
  && (defined(_M_IX86) || defined(_M_ARM_ARMV7VE) || defined(_M_ARM))
    __declspec(align (4)) unsigned char _[64];
#elif defined(__GNUC__) || defined(__INTEL_COMPILER)                           \
  || (defined(__SUNPRO_C) && __SUNPRO_C >= 0x590)                              \
  || (defined(__SUNPRO_CC) && __SUNPRO_CC >= 0x590)
    unsigned char _[64] __attribute__ ((aligned (sizeof (void *))));
#else
    unsigned char _[64];
#endif
} zmq_msg_t;

typedef void(zmq_free_fn) (void *data_, void *hint_);

ZMQ_EXPORT int zmq_msg_init (zmq_msg_t *msg_);
ZMQ_EXPORT int zmq_msg_init_size (zmq_msg_t *msg_, size_t size_);
ZMQ_EXPORT int zmq_msg_init_data (
  zmq_msg_t *msg_, void *data_, size_t size_, zmq_free_fn *ffn_, void *hint_);
ZMQ_EXPORT int zmq_msg_send (zmq_msg_t *msg_, void *s_, int flags_);
ZMQ_EXPORT int zmq_msg_recv (zmq_msg_t *msg_, void *s_, int flags_);
ZMQ_EXPORT int zmq_msg_close (zmq_msg_t *msg_);
ZMQ_EXPORT int zmq_msg_move (zmq_msg_t *dest_, zmq_msg_t *src_);
ZMQ_EXPORT int zmq_msg_copy (zmq_msg_t *dest_, zmq_msg_t *src_);
ZMQ_EXPORT void *zmq_msg_data (zmq_msg_t *msg_);
ZMQ_EXPORT size_t zmq_msg_size (const zmq_msg_t *msg_);
ZMQ_EXPORT int zmq_msg_more (const zmq_msg_t *msg_);
ZMQ_EXPORT int zmq_msg_get (const zmq_msg_t *msg_, int property_);
ZMQ_EXPORT int zmq_msg_set (zmq_msg_t *msg_, int property_, int optval_);
ZMQ_EXPORT const char *zmq_msg_gets (const zmq_msg_t *msg_,
                                     const char *property_);

/******************************************************************************/
/*  0MQ socket definition.                                                    */
/******************************************************************************/

/*  Socket types.                                                             */
#define ZMQ_PAIR 0
#define ZMQ_PUB 1
#define ZMQ_SUB 2
#define ZMQ_REQ 3
#define ZMQ_REP 4
#define ZMQ_DEALER 5
#define ZMQ_ROUTER 6
#define ZMQ_PULL 7
#define ZMQ_PUSH 8
#define ZMQ_XPUB 9
#define ZMQ_XSUB 10
#define ZMQ_STREAM 11

/*  Deprecated aliases                                                        */
#define ZMQ_XREQ ZMQ_DEALER
#define ZMQ_XREP ZMQ_ROUTER

/*  Socket options.                                                           */
#define ZMQ_AFFINITY 4
#define ZMQ_ROUTING_ID 5
#define ZMQ_SUBSCRIBE 6
#define ZMQ_UNSUBSCRIBE 7
#define ZMQ_RATE 8
#define ZMQ_RECOVERY_IVL 9
#define ZMQ_SNDBUF 11
#define ZMQ_RCVBUF 12
#define ZMQ_RCVMORE 13
#define ZMQ_FD 14
#define ZMQ_EVENTS 15
#define ZMQ_TYPE 16
#define ZMQ_LINGER 17
#define ZMQ_RECONNECT_IVL 18
#define ZMQ_BACKLOG 19
#define ZMQ_RECONNECT_IVL_MAX 21
#define ZMQ_MAXMSGSIZE 22
#define ZMQ_SNDHWM 23
#define ZMQ_RCVHWM 24
#define ZMQ_MULTICAST_HOPS 25
#define ZMQ_RCVTIMEO 27
#define ZMQ_SNDTIMEO 28
#define ZMQ_LAST_ENDPOINT 32
#define ZMQ_ROUTER_MANDATORY 33
#define ZMQ_TCP_KEEPALIVE 34
#define ZMQ_TCP_KEEPALIVE_CNT 35
#define ZMQ_TCP_KEEPALIVE_IDLE 36
#define ZMQ_TCP_KEEPALIVE_INTVL 37
#define ZMQ_IMMEDIATE 39
#define ZMQ_XPUB_VERBOSE 40
#define ZMQ_ROUTER_RAW 41
#define ZMQ_IPV6 42
#define ZMQ_MECHANISM 43
#define ZMQ_PLAIN_SERVER 44
#define ZMQ_PLAIN_USERNAME 45
#define ZMQ_PLAIN_PASSWORD 46
#define ZMQ_CURVE_SERVER 47
#define ZMQ_CURVE_PUBLICKEY 48
#define ZMQ_CURVE_SECRETKEY 49
#define ZMQ_CURVE_SERVERKEY 50
#define ZMQ_PROBE_ROUTER 51
#define ZMQ_REQ_CORRELATE 52
#define ZMQ_REQ_RELAXED 53
#define ZMQ_CONFLATE 54
#define ZMQ_ZAP_DOMAIN 55
#define ZMQ_ROUTER_HANDOVER 56
#define ZMQ_TOS 57
#define ZMQ_CONNECT_ROUTING_ID 61
#define ZMQ_GSSAPI_SERVER 62
#define ZMQ_GSSAPI_PRINCIPAL 63
#define ZMQ_GSSAPI_SERVICE_PRINCIPAL 64
#define ZMQ_GSSAPI_PLAINTEXT 65
#define ZMQ_HANDSHAKE_IVL 66
#define ZMQ_SOCKS_PROXY 68
#define ZMQ_XPUB_NODROP 69
#define ZMQ_BLOCKY 70
#define ZMQ_XPUB_MANUAL 71
#define ZMQ_XPUB_WELCOME_MSG 72
#define ZMQ_STREAM_NOTIFY 73
#define ZMQ_INVERT_MATCHING 74
#define ZMQ_HEARTBEAT_IVL 75
#define ZMQ_HEARTBEAT_TTL 76
#define ZMQ_HEARTBEAT_TIMEOUT 77
#define ZMQ_XPUB_VERBOSER 78
#define ZMQ_CONNECT_TIMEOUT 79
#define ZMQ_TCP_MAXRT 80
#define ZMQ_THREAD_SAFE 81
#define ZMQ_MULTICAST_MAXTPDU 84
#define ZMQ_VMCI_BUFFER_SIZE 85
#define ZMQ_VMCI_BUFFER_MIN_SIZE 86
#define ZMQ_VMCI_BUFFER_MAX_SIZE 87
#define ZMQ_VMCI_CONNECT_TIMEOUT 88
#define ZMQ_USE_FD 89
#define ZMQ_GSSAPI_PRINCIPAL_NAMETYPE 90
#define ZMQ_GSSAPI_SERVICE_PRINCIPAL_NAMETYPE 91
#define ZMQ_BINDTODEVICE 92

/*  Message options                                                           */
#define ZMQ_MORE 1
#define ZMQ_SHARED 3

/*  Send/recv options.                                                        */
#define ZMQ_DONTWAIT 1
#define ZMQ_SNDMORE 2

/*  Security mechanisms                                                       */
#define ZMQ_NULL 0
#define ZMQ_PLAIN 1
#define ZMQ_CURVE 2
#define ZMQ_GSSAPI 3

/*  RADIO-DISH protocol                                                       */
#define ZMQ_GROUP_MAX_LENGTH 255

/*  Deprecated options and aliases                                            */
#define ZMQ_IDENTITY ZMQ_ROUTING_ID
#define ZMQ_CONNECT_RID ZMQ_CONNECT_ROUTING_ID
#define ZMQ_TCP_ACCEPT_FILTER 38
#define ZMQ_IPC_FILTER_PID 58
#define ZMQ_IPC_FILTER_UID 59
#define ZMQ_IPC_FILTER_GID 60
#define ZMQ_IPV4ONLY 31
#define ZMQ_DELAY_ATTACH_ON_CONNECT ZMQ_IMMEDIATE
#define ZMQ_NOBLOCK ZMQ_DONTWAIT
#define ZMQ_FAIL_UNROUTABLE ZMQ_ROUTER_MANDATORY
#define ZMQ_ROUTER_BEHAVIOR ZMQ_ROUTER_MANDATORY

/*  Deprecated Message options                                                */
#define ZMQ_SRCFD 2

/******************************************************************************/
/*  GSSAPI definitions                                                        */
/******************************************************************************/

/*  GSSAPI principal name types                                               */
#define ZMQ_GSSAPI_NT_HOSTBASED 0
#define ZMQ_GSSAPI_NT_USER_NAME 1
#define ZMQ_GSSAPI_NT_KRB5_PRINCIPAL 2

/******************************************************************************/
/*  0MQ socket events and monitoring                                          */
/******************************************************************************/

/*  Socket transport events (TCP, IPC and TIPC only)                          */

#define ZMQ_EVENT_CONNECTED 0x0001
#define ZMQ_EVENT_CONNECT_DELAYED 0x0002
#define ZMQ_EVENT_CONNECT_RETRIED 0x0004
#define ZMQ_EVENT_LISTENING 0x0008
#define ZMQ_EVENT_BIND_FAILED 0x0010
#define ZMQ_EVENT_ACCEPTED 0x0020
#define ZMQ_EVENT_ACCEPT_FAILED 0x0040
#define ZMQ_EVENT_CLOSED 0x0080
#define ZMQ_EVENT_CLOSE_FAILED 0x0100
#define ZMQ_EVENT_DISCONNECTED 0x0200
#define ZMQ_EVENT_MONITOR_STOPPED 0x0400
#define ZMQ_EVENT_ALL 0xFFFF
/*  Unspecified system errors during handshake. Event value is an errno.      */
#define ZMQ_EVENT_HANDSHAKE_FAILED_NO_DETAIL 0x0800
/*  Handshake complete successfully with successful authentication (if        *
 *  enabled). Event value is unused.                                          */
#define ZMQ_EVENT_HANDSHAKE_SUCCEEDED 0x1000
/*  Protocol errors between ZMTP peers or between server and ZAP handler.     *
 *  Event value is one of ZMQ_PROTOCOL_ERROR_*                                */
#define ZMQ_EVENT_HANDSHAKE_FAILED_PROTOCOL 0x2000
/*  Failed authentication requests. Event value is the numeric ZAP status     *
 *  code, i.e. 300, 400 or 500.                                               */
#define ZMQ_EVENT_HANDSHAKE_FAILED_AUTH 0x4000
#define ZMQ_PROTOCOL_ERROR_ZMTP_UNSPECIFIED 0x10000000
#define ZMQ_PROTOCOL_ERROR_ZMTP_UNEXPECTED_COMMAND 0x10000001
#define ZMQ_PROTOCOL_ERROR_ZMTP_INVALID_SEQUENCE 0x10000002
#define ZMQ_PROTOCOL_ERROR_ZMTP_KEY_EXCHANGE 0x10000003
#define ZMQ_PROTOCOL_ERROR_ZMTP_MALFORMED_COMMAND_UNSPECIFIED 0x10000011
#define ZMQ_PROTOCOL_ERROR_ZMTP_MALFORMED_COMMAND_MESSAGE 0x10000012
#define ZMQ_PROTOCOL_ERROR_ZMTP_MALFORMED_COMMAND_HELLO 0x10000013
#define ZMQ_PROTOCOL_ERROR_ZMTP_MALFORMED_COMMAND_INITIATE 0x10000014
#define ZMQ_PROTOCOL_ERROR_ZMTP_MALFORMED_COMMAND_ERROR 0x10000015
#define ZMQ_PROTOCOL_ERROR_ZMTP_MALFORMED_COMMAND_READY 0x10000016
#define ZMQ_PROTOCOL_ERROR_ZMTP_MALFORMED_COMMAND_WELCOME 0x10000017
#define ZMQ_PROTOCOL_ERROR_ZMTP_INVALID_METADATA 0x10000018
// the following two may be due to erroneous configuration of a peer
#define ZMQ_PROTOCOL_ERROR_ZMTP_CRYPTOGRAPHIC 0x11000001
#define ZMQ_PROTOCOL_ERROR_ZMTP_MECHANISM_MISMATCH 0x11000002
#define ZMQ_PROTOCOL_ERROR_ZAP_UNSPECIFIED 0x20000000
#define ZMQ_PROTOCOL_ERROR_ZAP_MALFORMED_REPLY 0x20000001
#define ZMQ_PROTOCOL_ERROR_ZAP_BAD_REQUEST_ID 0x20000002
#define ZMQ_PROTOCOL_ERROR_ZAP_BAD_VERSION 0x20000003
#define ZMQ_PROTOCOL_ERROR_ZAP_INVALID_STATUS_CODE 0x20000004
#define ZMQ_PROTOCOL_ERROR_ZAP_INVALID_METADATA 0x20000005
#define ZMQ_PROTOCOL_ERROR_WS_UNSPECIFIED 0x30000000

ZMQ_EXPORT void *zmq_socket (void *, int type_);
ZMQ_EXPORT int zmq_close (void *s_);
ZMQ_EXPORT int
zmq_setsockopt (void *s_, int option_, const void *optval_, size_t optvallen_);
ZMQ_EXPORT int
zmq_getsockopt (void *s_, int option_, void *optval_, size_t *optvallen_);
ZMQ_EXPORT int zmq_bind (void *s_, const char *addr_);
ZMQ_EXPORT int zmq_connect (void *s_, const char *addr_);
ZMQ_EXPORT int zmq_unbind (void *s_, const char *addr_);
ZMQ_EXPORT int zmq_disconnect (void *s_, const char *addr_);
ZMQ_EXPORT int zmq_send (void *s_, const void *buf_, size_t len_, int flags_);
ZMQ_EXPORT int
zmq_send_const (void *s_, const void *buf_, size_t len_, int flags_);
ZMQ_EXPORT int zmq_recv (void *s_, void *buf_, size_t len_, int flags_);
ZMQ_EXPORT int zmq_socket_monitor (void *s_, const char *addr_, int events_);

/******************************************************************************/
/*  Hide socket fd type; this was before zmq_poller_event_t typedef below     */
/******************************************************************************/

#if defined _WIN32
// Windows uses a pointer-sized unsigned integer to store the socket fd.
#if defined _WIN64
typedef unsigned __int64 zmq_fd_t;
#else
typedef unsigned int zmq_fd_t;
#endif
#else
typedef int zmq_fd_t;
#endif

/******************************************************************************/
/*  Deprecated I/O multiplexing. Prefer using zmq_poller API                  */
/******************************************************************************/

#define ZMQ_POLLIN 1
#define ZMQ_POLLOUT 2
#define ZMQ_POLLERR 4
#define ZMQ_POLLPRI 8

typedef struct zmq_pollitem_t
{
    void *socket;
    zmq_fd_t fd;
    short events;
    short revents;
} zmq_pollitem_t;

#define ZMQ_POLLITEMS_DFLT 16

ZMQ_EXPORT int zmq_poll (zmq_pollitem_t *items_, int nitems_, long timeout_);

/******************************************************************************/
/*  Message proxying                                                          */
/******************************************************************************/

ZMQ_EXPORT int zmq_proxy (void *frontend_, void *backend_, void *capture_);
ZMQ_EXPORT int zmq_proxy_steerable (void *frontend_,
                                    void *backend_,
                                    void *capture_,
                                    void *control_);

/******************************************************************************/
/*  Probe library capabilities                                                */
/******************************************************************************/

#define ZMQ_HAS_CAPABILITIES 1
ZMQ_EXPORT int zmq_has (const char *capability_);

/*  Deprecated aliases */
#define ZMQ_STREAMER 1
#define ZMQ_FORWARDER 2
#define ZMQ_QUEUE 3

/*  Deprecated methods */
ZMQ_EXPORT int zmq_device (int type_, void *frontend_, void *backend_);
ZMQ_EXPORT int zmq_sendmsg (void *s_, zmq_msg_t *msg_, int flags_);
ZMQ_EXPORT int zmq_recvmsg (void *s_, zmq_msg_t *msg_, int flags_);
struct iovec;
ZMQ_EXPORT int
zmq_sendiov (void *s_, struct iovec *iov_, size_t count_, int flags_);
ZMQ_EXPORT int
zmq_recviov (void *s_, struct iovec *iov_, size_t *count_, int flags_);

/******************************************************************************/
/*  Encryption functions                                                      */
/******************************************************************************/

/*  Encode data with Z85 encoding. Returns encoded data                       */
ZMQ_EXPORT char *
zmq_z85_encode (char *dest_, const uint8_t *data_, size_t size_);

/*  Decode data with Z85 encoding. Returns decoded data                       */
ZMQ_EXPORT uint8_t *zmq_z85_decode (uint8_t *dest_, const char *string_);

/*  Generate z85-encoded public and private keypair with tweetnacl/libsodium. */
/*  Returns 0 on success.                                                     */
ZMQ_EXPORT int zmq_curve_keypair (char *z85_public_key_, char *z85_secret_key_);

/*  Derive the z85-encoded public key from the z85-encoded secret key.        */
/*  Returns 0 on success.                                                     */
ZMQ_EXPORT int zmq_curve_public (char *z85_public_key_,
                                 const char *z85_secret_key_);

/******************************************************************************/
/*  Atomic utility methods                                                    */
/******************************************************************************/

ZMQ_EXPORT void *zmq_atomic_counter_new (void);
ZMQ_EXPORT void zmq_atomic_counter_set (void *counter_, int value_);
ZMQ_EXPORT int zmq_atomic_counter_inc (void *counter_);
ZMQ_EXPORT int zmq_atomic_counter_dec (void *counter_);
ZMQ_EXPORT int zmq_atomic_counter_value (void *counter_);
ZMQ_EXPORT void zmq_atomic_counter_destroy (void **counter_p_);

/******************************************************************************/
/*  Scheduling timers                                                         */
/******************************************************************************/

#define ZMQ_HAVE_TIMERS

typedef void(zmq_timer_fn) (int timer_id, void *arg);

ZMQ_EXPORT void *zmq_timers_new (void);
ZMQ_EXPORT int zmq_timers_destroy (void **timers_p);
ZMQ_EXPORT int
zmq_timers_add (void *timers, size_t interval, zmq_timer_fn handler, void *arg);
ZMQ_EXPORT int zmq_timers_cancel (void *timers, int timer_id);
ZMQ_EXPORT int
zmq_timers_set_interval (void *timers, int timer_id, size_t interval);
ZMQ_EXPORT int zmq_timers_reset (void *timers, int timer_id);
ZMQ_EXPORT long zmq_timers_timeout (void *timers);
ZMQ_EXPORT int zmq_timers_execute (void *timers);


/******************************************************************************/
/*  These functions are not documented by man pages -- use at your own risk.  */
/*  If you need these to be part of the formal ZMQ API, then (a) write a man  */
/*  page, and (b) write a test case in tests.                                 */
/******************************************************************************/

/*  Helper functions are used by perf tests so that they don't have to care   */
/*  about minutiae of time-related functions on different OS platforms.       */

/*  Starts the stopwatch. Returns the handle to the watch.                    */
ZMQ_EXPORT void *zmq_stopwatch_start (void);

/*  Returns the number of microseconds elapsed since the stopwatch was        */
/*  started, but does not stop or deallocate the stopwatch.                   */
ZMQ_EXPORT unsigned long zmq_stopwatch_intermediate (void *watch_);

/*  Stops the stopwatch. Returns the number of microseconds elapsed since     */
/*  the stopwatch was started, and deallocates that watch.                    */
ZMQ_EXPORT unsigned long zmq_stopwatch_stop (void *watch_);

/*  Sleeps for specified number of seconds.                                   */
ZMQ_EXPORT void zmq_sleep (int seconds_);

typedef void(zmq_thread_fn) (void *);

/* Start a thread. Returns a handle to the thread.                            */
ZMQ_EXPORT void *zmq_threadstart (zmq_thread_fn *func_, void *arg_);

/* Wait for thread to complete then free up resources.                        */
ZMQ_EXPORT void zmq_threadclose (void *thread_);


/******************************************************************************/
/*  These functions are DRAFT and disabled in stable releases, and subject to */
/*  change at ANY time until declared stable.                                 */
/******************************************************************************/

#ifdef ZMQ_BUILD_DRAFT_API

/*  DRAFT Socket types.                                                       */
#define ZMQ_SERVER 12
#define ZMQ_CLIENT 13
#define ZMQ_RADIO 14
#define ZMQ_DISH 15
#define ZMQ_GATHER 16
#define ZMQ_SCATTER 17
#define ZMQ_DGRAM 18
#define ZMQ_PEER 19
#define ZMQ_CHANNEL 20

/*  DRAFT Socket options.                                                     */
#define ZMQ_ZAP_ENFORCE_DOMAIN 93
#define ZMQ_LOOPBACK_FASTPATH 94
#define ZMQ_METADATA 95
#define ZMQ_MULTICAST_LOOP 96
#define ZMQ_ROUTER_NOTIFY 97
#define ZMQ_XPUB_MANUAL_LAST_VALUE 98
#define ZMQ_SOCKS_USERNAME 99
#define ZMQ_SOCKS_PASSWORD 100
#define ZMQ_IN_BATCH_SIZE 101
#define ZMQ_OUT_BATCH_SIZE 102
#define ZMQ_WSS_KEY_PEM 103
#define ZMQ_WSS_CERT_PEM 104
#define ZMQ_WSS_TRUST_PEM 105
#define ZMQ_WSS_HOSTNAME 106
#define ZMQ_WSS_TRUST_SYSTEM 107
#define ZMQ_ONLY_FIRST_SUBSCRIBE 108
#define ZMQ_RECONNECT_STOP 109
#define ZMQ_HELLO_MSG 110
#define ZMQ_DISCONNECT_MSG 111
#define ZMQ_PRIORITY 112

/*  DRAFT ZMQ_RECONNECT_STOP options                                          */
#define ZMQ_RECONNECT_STOP_CONN_REFUSED 0x1
#define ZMQ_RECONNECT_STOP_HANDSHAKE_FAILED 0x2
#define ZMQ_RECONNECT_STOP_AFTER_DISCONNECT 0x3

/*  DRAFT Context options                                                     */
#define ZMQ_ZERO_COPY_RECV 10

/*  DRAFT Context methods.                                                    */
ZMQ_EXPORT int zmq_ctx_set_ext (void *context_,
                                int option_,
                                const void *optval_,
                                size_t optvallen_);
ZMQ_EXPORT int zmq_ctx_get_ext (void *context_,
                                int option_,
                                void *optval_,
                                size_t *optvallen_);

/*  DRAFT Socket methods.                                                     */
ZMQ_EXPORT int zmq_join (void *s, const char *group);
ZMQ_EXPORT int zmq_leave (void *s, const char *group);
ZMQ_EXPORT uint32_t zmq_connect_peer (void *s_, const char *addr_);

/*  DRAFT Msg methods.                                                        */
ZMQ_EXPORT int zmq_msg_set_routing_id (zmq_msg_t *msg, uint32_t routing_id);
ZMQ_EXPORT uint32_t zmq_msg_routing_id (zmq_msg_t *msg);
ZMQ_EXPORT int zmq_msg_set_group (zmq_msg_t *msg, const char *group);
ZMQ_EXPORT const char *zmq_msg_group (zmq_msg_t *msg);
ZMQ_EXPORT int
zmq_msg_init_buffer (zmq_msg_t *msg_, const void *buf_, size_t size_);

/*  DRAFT Msg property names.                                                 */
#define ZMQ_MSG_PROPERTY_ROUTING_ID "Routing-Id"
#define ZMQ_MSG_PROPERTY_SOCKET_TYPE "Socket-Type"
#define ZMQ_MSG_PROPERTY_USER_ID "User-Id"
#define ZMQ_MSG_PROPERTY_PEER_ADDRESS "Peer-Address"

/*  Router notify options                                                     */
#define ZMQ_NOTIFY_CONNECT 1
#define ZMQ_NOTIFY_DISCONNECT 2

/******************************************************************************/
/*  Poller polling on sockets,fd and thread-safe sockets                      */
/******************************************************************************/

#define ZMQ_HAVE_POLLER

typedef struct zmq_poller_event_t
{
    void *socket;
    zmq_fd_t fd;
    void *user_data;
    short events;
} zmq_poller_event_t;

ZMQ_EXPORT void *zmq_poller_new (void);
ZMQ_EXPORT int zmq_poller_destroy (void **poller_p);
ZMQ_EXPORT int zmq_poller_size (void *poller);
ZMQ_EXPORT int
zmq_poller_add (void *poller, void *socket, void *user_data, short events);
ZMQ_EXPORT int zmq_poller_modify (void *poller, void *socket, short events);
ZMQ_EXPORT int zmq_poller_remove (void *poller, void *socket);
ZMQ_EXPORT int
zmq_poller_wait (void *poller, zmq_poller_event_t *event, long timeout);
ZMQ_EXPORT int zmq_poller_wait_all (void *poller,
                                    zmq_poller_event_t *events,
                                    int n_events,
                                    long timeout);
ZMQ_EXPORT int zmq_poller_fd (void *poller, zmq_fd_t *fd);

ZMQ_EXPORT int
zmq_poller_add_fd (void *poller, zmq_fd_t fd, void *user_data, short events);
ZMQ_EXPORT int zmq_poller_modify_fd (void *poller, zmq_fd_t fd, short events);
ZMQ_EXPORT int zmq_poller_remove_fd (void *poller, zmq_fd_t fd);

ZMQ_EXPORT int zmq_socket_get_peer_state (void *socket,
                                          const void *routing_id,
                                          size_t routing_id_size);

/*  DRAFT Socket monitoring events                                            */
#define ZMQ_EVENT_PIPES_STATS 0x10000

#define ZMQ_CURRENT_EVENT_VERSION 1
#define ZMQ_CURRENT_EVENT_VERSION_DRAFT 2

#define ZMQ_EVENT_ALL_V1 ZMQ_EVENT_ALL
#define ZMQ_EVENT_ALL_V2 ZMQ_EVENT_ALL_V1 | ZMQ_EVENT_PIPES_STATS

ZMQ_EXPORT int zmq_socket_monitor_versioned (
  void *s_, const char *addr_, uint64_t events_, int event_version_, int type_);
ZMQ_EXPORT int zmq_socket_monitor_pipes_stats (void *s);

#endif // ZMQ_BUILD_DRAFT_API


#undef ZMQ_EXPORT

#ifdef __cplusplus
}
#endif

#endif