zmq_ctx_get.txt 2.07 KB
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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.

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ZMQ_MAX_SOCKETS: Get maximum number of sockets
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The 'ZMQ_MAX_SOCKETS' argument returns the maximum number of sockets
allowed for this context.

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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.
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ZMQ_IPV6: Set IPv6 option
~~~~~~~~~~~~~~~~~~~~~~~~~
The 'ZMQ_IPV6' argument returns the IPv6 option for the context.

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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.

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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.


EXAMPLE
-------
.Setting a limit on the number of sockets
----
void *context = zmq_ctx_new ();
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zmq_ctx_set (context, ZMQ_MAX_SOCKETS, 256);
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int max_sockets = zmq_ctx_get (context, ZMQ_MAX_SOCKETS);
assert (max_sockets == 256);
----
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.Switching off the context deadlock gambit
----
zmq_ctx_set (ctx, ZMQ_BLOCKY, false);
----
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SEE ALSO
--------
linkzmq:zmq_ctx_set[3]
linkzmq:zmq[7]


AUTHORS
-------
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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>.