zmq_ctx_get (3)

int zmq_ctx_get (void *context, int option_name);

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_IPV6: Set IPv6 option

The ZMQ_IPV6 argument returns the IPv6 option for the context.

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.

EINVAL

The requested option option_name is unknown.

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);

zmq_ctx_set(3) zmq(7)

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