high-level socket API that hides libzmq contexts and sockets Create a new socket. Returns the new socket, or NULL if the new socket could not be created. Note that the symbol zsock_new (and other constructors/destructors for zsock) are redirected to the *_checked variant, enabling intelligent socket leak detection. This can have performance implications if you use a LOT of sockets. To turn off this redirection behaviour, define ZSOCK_NOCHECK. Destroy the socket. You must use this for any socket created via the zsock_new method. Create a PUB socket. Default action is bind. Create a SUB socket, and optionally subscribe to some prefix string. Default action is connect. Create a REQ socket. Default action is connect. Create a REP socket. Default action is bind. Create a DEALER socket. Default action is connect. Create a ROUTER socket. Default action is bind. Create a PUSH socket. Default action is connect. Create a PULL socket. Default action is bind. Create an XPUB socket. Default action is bind. Create an XSUB socket. Default action is connect. Create a PAIR socket. Default action is connect. Create a STREAM socket. Default action is connect. Create a SERVER socket. Default action is bind. Create a CLIENT socket. Default action is connect. Create a RADIO socket. Default action is bind. Create a DISH socket. Default action is connect. Create a GATHER socket. Default action is bind. Create a SCATTER socket. Default action is connect. Bind a socket to a formatted endpoint. For tcp:// endpoints, supports ephemeral ports, if you specify the port number as "*". By default zsock uses the IANA designated range from C000 (49152) to FFFF (65535). To override this range, follow the "*" with "[first-last]". Either or both first and last may be empty. To bind to a random port within the range, use "!" in place of "*". Examples: tcp://127.0.0.1:* bind to first free port from C000 up tcp://127.0.0.1:! bind to random port from C000 to FFFF tcp://127.0.0.1:*[60000-] bind to first free port from 60000 up tcp://127.0.0.1:![-60000] bind to random port from C000 to 60000 tcp://127.0.0.1:![55000-55999] bind to random port from 55000 to 55999 On success, returns the actual port number used, for tcp:// endpoints, and 0 for other transports. On failure, returns -1. Note that when using ephemeral ports, a port may be reused by different services without clients being aware. Protocols that run on ephemeral ports should take this into account. Returns last bound endpoint, if any. Unbind a socket from a formatted endpoint. Returns 0 if OK, -1 if the endpoint was invalid or the function isn't supported. Connect a socket to a formatted endpoint Returns 0 if OK, -1 if the endpoint was invalid. Disconnect a socket from a formatted endpoint Returns 0 if OK, -1 if the endpoint was invalid or the function isn't supported. Attach a socket to zero or more endpoints. If endpoints is not null, parses as list of ZeroMQ endpoints, separated by commas, and prefixed by '@' (to bind the socket) or '>' (to connect the socket). Returns 0 if all endpoints were valid, or -1 if there was a syntax error. If the endpoint does not start with '@' or '>', the serverish argument defines whether it is used to bind (serverish = true) or connect (serverish = false). Returns socket type as printable constant string. Send a 'picture' message to the socket (or actor). The picture is a string that defines the type of each frame. This makes it easy to send a complex multiframe message in one call. The picture can contain any of these characters, each corresponding to one or two arguments: i = int (signed) 1 = uint8_t 2 = uint16_t 4 = uint32_t 8 = uint64_t s = char * b = byte *, size_t (2 arguments) c = zchunk_t * f = zframe_t * h = zhashx_t * l = zlistx_t * (DRAFT) U = zuuid_t * p = void * (sends the pointer value, only meaningful over inproc) m = zmsg_t * (sends all frames in the zmsg) z = sends zero-sized frame (0 arguments) u = uint (deprecated) Note that s, b, c, and f are encoded the same way and the choice is offered as a convenience to the sender, which may or may not already have data in a zchunk or zframe. Does not change or take ownership of any arguments. Returns 0 if successful, -1 if sending failed for any reason. Send a 'picture' message to the socket (or actor). This is a va_list version of zsock_send (), so please consult its documentation for the details. Receive a 'picture' message to the socket (or actor). See zsock_send for the format and meaning of the picture. Returns the picture elements into a series of pointers as provided by the caller: i = int * (stores signed integer) 4 = uint32_t * (stores 32-bit unsigned integer) 8 = uint64_t * (stores 64-bit unsigned integer) s = char ** (allocates new string) b = byte **, size_t * (2 arguments) (allocates memory) c = zchunk_t ** (creates zchunk) f = zframe_t ** (creates zframe) U = zuuid_t * (creates a zuuid with the data) h = zhashx_t ** (creates zhashx) l = zlistx_t ** (creates zlistx) (DRAFT) p = void ** (stores pointer) m = zmsg_t ** (creates a zmsg with the remaining frames) z = null, asserts empty frame (0 arguments) u = uint * (stores unsigned integer, deprecated) Note that zsock_recv creates the returned objects, and the caller must destroy them when finished with them. The supplied pointers do not need to be initialized. Returns 0 if successful, or -1 if it failed to recv a message, in which case the pointers are not modified. When message frames are truncated (a short message), sets return values to zero/null. If an argument pointer is NULL, does not store any value (skips it). An 'n' picture matches an empty frame; if the message does not match, the method will return -1. Receive a 'picture' message from the socket (or actor). This is a va_list version of zsock_recv (), so please consult its documentation for the details. Send a binary encoded 'picture' message to the socket (or actor). This method is similar to zsock_send, except the arguments are encoded in a binary format that is compatible with zproto, and is designed to reduce memory allocations. The pattern argument is a string that defines the type of each argument. Supports these argument types: pattern C type zproto type: 1 uint8_t type = "number" size = "1" 2 uint16_t type = "number" size = "2" 4 uint32_t type = "number" size = "3" 8 uint64_t type = "number" size = "4" s char *, 0-255 chars type = "string" S char *, 0-2^32-1 chars type = "longstr" c zchunk_t * type = "chunk" f zframe_t * type = "frame" u zuuid_t * type = "uuid" m zmsg_t * type = "msg" p void *, sends pointer value, only over inproc Does not change or take ownership of any arguments. Returns 0 if successful, -1 if sending failed for any reason. Receive a binary encoded 'picture' message from the socket (or actor). This method is similar to zsock_recv, except the arguments are encoded in a binary format that is compatible with zproto, and is designed to reduce memory allocations. The pattern argument is a string that defines the type of each argument. See zsock_bsend for the supported argument types. All arguments must be pointers; this call sets them to point to values held on a per-socket basis. For types 1, 2, 4 and 8 the caller must allocate the memory itself before calling zsock_brecv. For types S, the caller must free the value once finished with it, as zsock_brecv will allocate the buffer. For type s, the caller must not free the value as it is stored in a local cache for performance purposes. For types c, f, u and m the caller must call the appropriate destructor depending on the object as zsock_brecv will create new objects. For type p the caller must coordinate with the sender, as it is just a pointer value being passed. Return socket routing ID if any. This returns 0 if the socket is not of type ZMQ_SERVER or if no request was already received on it. Set routing ID on socket. The socket MUST be of type ZMQ_SERVER. This will be used when sending messages on the socket via the zsock API. Set socket to use unbounded pipes (HWM=0); use this in cases when you are totally certain the message volume can fit in memory. This method works across all versions of ZeroMQ. Takes a polymorphic socket reference. Send a signal over a socket. A signal is a short message carrying a success/failure code (by convention, 0 means OK). Signals are encoded to be distinguishable from "normal" messages. Accepts a zsock_t or a zactor_t argument, and returns 0 if successful, -1 if the signal could not be sent. Takes a polymorphic socket reference. Wait on a signal. Use this to coordinate between threads, over pipe pairs. Blocks until the signal is received. Returns -1 on error, 0 or greater on success. Accepts a zsock_t or a zactor_t as argument. Takes a polymorphic socket reference. If there is a partial message still waiting on the socket, remove and discard it. This is useful when reading partial messages, to get specific message types. Join a group for the RADIO-DISH pattern. Call only on ZMQ_DISH. Returns 0 if OK, -1 if failed. Leave a group for the RADIO-DISH pattern. Call only on ZMQ_DISH. Returns 0 if OK, -1 if failed. Probe the supplied object, and report if it looks like a zsock_t. Takes a polymorphic socket reference. Probe the supplied reference. If it looks like a zsock_t instance, return the underlying libzmq socket handle; else if it looks like a file descriptor, return NULL; else if it looks like a libzmq socket handle, return the supplied value. Takes a polymorphic socket reference. Check whether the socket has available message to read.