zmq_ctx_get(3) ============== NAME ---- zmq_ctx_get - get context options SYNOPSIS -------- *int zmq_ctx_get (void '*context', int 'option_name');* DESCRIPTION ----------- The _zmq_ctx_get()_ function shall return the option specified by the 'option_name' argument. The _zmq_ctx_get()_ function accepts the following option names: ZMQ_IO_THREADS: Get number of I/O threads ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The 'ZMQ_IO_THREADS' argument returns the size of the 0MQ thread pool for this context. ZMQ_MAX_SOCKETS: Get maximum number of sockets ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The 'ZMQ_MAX_SOCKETS' argument returns the maximum number of sockets allowed for this context. ZMQ_MAX_MSGSZ: Get maximum message size ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The 'ZMQ_MAX_MSGSZ' argument returns the maximum size of a message allowed for this context. Default value is INT_MAX. ZMQ_ZERO_COPY_RECV: Get message decoding strategy ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The 'ZMQ_ZERO_COPY_RECV' argument return whether message decoder uses a zero copy strategy when receiving messages. Default value is 1. NOTE: in DRAFT state, not yet available in stable releases. ZMQ_SOCKET_LIMIT: Get largest configurable number of sockets ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The 'ZMQ_SOCKET_LIMIT' argument returns the largest number of sockets that linkzmq:zmq_ctx_set[3] will accept. ZMQ_IPV6: Set IPv6 option ~~~~~~~~~~~~~~~~~~~~~~~~~ The 'ZMQ_IPV6' argument returns the IPv6 option for the context. ZMQ_BLOCKY: Get blocky setting ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The 'ZMQ_BLOCKY' argument returns 1 if the context will block on terminate, zero if the "block forever on context termination" gambit was disabled by setting ZMQ_BLOCKY to false on all new contexts. ZMQ_THREAD_SCHED_POLICY: Get scheduling policy for I/O threads ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The 'ZMQ_THREAD_SCHED_POLICY' argument returns the scheduling policy for internal context's thread pool. ZMQ_THREAD_NAME_PREFIX: Get name prefix for I/O threads ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The 'ZMQ_THREAD_NAME_PREFIX' argument gets the numeric prefix of each thread created for the internal context's thread pool. ZMQ_MSG_T_SIZE: Get the zmq_msg_t size at runtime ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The 'ZMQ_MSG_T_SIZE' argument returns the size of the zmq_msg_t structure at runtime, as defined in the include/zmq.h public header. This is useful for example for FFI bindings that can't simply do a sizeof(). RETURN VALUE ------------ The _zmq_ctx_get()_ function returns a value of 0 or greater if successful. Otherwise it returns `-1` and sets 'errno' to one of the values defined below. ERRORS ------ *EINVAL*:: The requested option _option_name_ is unknown. *EFAULT*:: The provided 'context' is invalid. EXAMPLE ------- .Setting a limit on the number of sockets ---- void *context = zmq_ctx_new (); zmq_ctx_set (context, ZMQ_MAX_SOCKETS, 256); int max_sockets = zmq_ctx_get (context, ZMQ_MAX_SOCKETS); assert (max_sockets == 256); ---- .Switching off the context deadlock gambit ---- zmq_ctx_set (ctx, ZMQ_BLOCKY, false); ---- SEE ALSO -------- linkzmq:zmq_ctx_set[3] linkzmq:zmq[7] AUTHORS ------- This page was written by the 0MQ community. To make a change please read the 0MQ Contribution Policy at .