zmq_ctx_get - get context options

       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                                          03/31/2024                                     ZMQ_CTX_GET(3)

       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:GetnumberofI/Othreads
       The ZMQ_IO_THREADS argument returns the size of the 0MQ thread pool for this context.

   ZMQ_MAX_SOCKETS:Getmaximumnumberofsockets
       The ZMQ_MAX_SOCKETS argument returns the maximum number of sockets allowed for this context.

   ZMQ_MAX_MSGSZ:Getmaximummessagesize
       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:Getmessagedecodingstrategy
       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:Getlargestconfigurablenumberofsockets
       The ZMQ_SOCKET_LIMIT argument returns the largest number of sockets that zmq_ctx_set(3) will accept.

   ZMQ_IPV6:SetIPv6option
       The ZMQ_IPV6 argument returns the IPv6 option for the context.

   ZMQ_BLOCKY:Getblockysetting
       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:GetschedulingpolicyforI/Othreads
       The ZMQ_THREAD_SCHED_POLICY argument returns the scheduling policy for internal context’s thread pool.

   ZMQ_THREAD_NAME_PREFIX:GetnameprefixforI/Othreads
       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:Getthezmq_msg_tsizeatruntime
       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().

EINVAL
           The requested option option_name is unknown.

       EFAULT
           The provided context is invalid.

Settingalimitonthenumberofsockets.

           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);

       Switchingoffthecontextdeadlockgambit.

           zmq_ctx_set (ctx, ZMQ_BLOCKY, false);

       zmq_ctx_get - get context options

       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.

zmq_ctx_set(3) zmq(7)

intzmq_ctx_get(void*context,intoption_name);