ZMQ_CTX_GET(3) 0MQ Manual 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 op- tion_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 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 in- ternal 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 zmq_ctx_set(3) zmq(7) AUTHORS This page was written by the 0MQ community. To make a change please read the 0MQ Contribution Policy at http://www.zeromq.org/docs:contributing. 0MQ 4.3.5 10/09/2023 ZMQ_CTX_GET(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLE | SEE ALSO | AUTHORS
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