From 5f7289e1f8e1427c9214c8e3e96ad56b1f868d53 Mon Sep 17 00:00:00 2001
From: Garrett D'Amore <garrett@damore.org>
Date: Wed, 4 Apr 2018 13:36:54 -0700
Subject: fixes #334 Separate context for state machines from sockets

This provides context support for REQ and REP sockets.
More discussion around this is in the issue itself.

Optionally we would like to extend this to the surveyor pattern.

Note that we specifically do not support pollable descriptors
for non-default contexts, and the results of using file descriptors
for polling (NNG_OPT_SENDFD and NNG_OPT_RECVFD) is undefined.

In the future, it might be nice to figure out how to factor in
optional use of a message queue for users who want more buffering,
but we think there is little need for this with cooked mode.
---
 docs/man/nng_ctx_setopt.3.adoc | 109 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 docs/man/nng_ctx_setopt.3.adoc

(limited to 'docs/man/nng_ctx_setopt.3.adoc')

diff --git a/docs/man/nng_ctx_setopt.3.adoc b/docs/man/nng_ctx_setopt.3.adoc
new file mode 100644
index 00000000..4ab36e07
--- /dev/null
+++ b/docs/man/nng_ctx_setopt.3.adoc
@@ -0,0 +1,109 @@
+= nng_ctx_setopt(3)
+//
+// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2018 Capitar IT Group BV <info@capitar.com>
+//
+// This document is supplied under the terms of the MIT License, a
+// copy of which should be located in the distribution where this
+// file was obtained (LICENSE.txt).  A copy of the license may also be
+// found online at https://opensource.org/licenses/MIT.
+//
+
+== NAME
+
+nng_ctx_setopt - set context option
+
+== SYNOPSIS
+
+[source, c]
+----
+#include <nng/nng.h>
+
+int nng_ctx_setopt(nng_ctx ctx, const char *opt, const void *val, size_t valsz);
+
+int nng_ctx_setopt_bool(nng_ctx ctx, const char *opt, int bval);
+
+int nng_ctx_setopt_int(nng_ctx ctx, const char *opt, int ival);
+
+int nng_ctx_setopt_ms(nng_ctx ctx, const char *opt, nng_duration dur);
+
+int nng_ctx_setopt_size(nng_ctx ctx, const char *opt, size_t z);
+
+int nng_ctx_setopt_string(nng_ctx ctx, const char *opt, const char *str);
+
+int nng_ctx_setopt_uint64(nng_ctx ctx, const char *opt, uint64_t u64);
+----
+
+== DESCRIPTION
+(((options, context)))
+The `nng_ctx_setopt()` functions are used to configure options for
+the context _ctx_.
+The actual options that may be configured in this way vary, and are
+specified by _opt_.
+
+NOTE: Context options are protocol specific.
+The details will be documented with the protocol.
+
+=== Forms
+
+The details of the type, size, and semantics of the option will depend
+on the actual option, and will be documented with the option itself.
+
+TIP: Generally, it will be easier to use one of the typed versions
+of this function.
+
+==== `nng_ctx_setopt()`
+This function is untyped, and can be used to configure any arbitrary data.
+The _val_ pointer addresses the data to copy, and _valsz_ is the
+size of the objected located at _val_.
+
+==== `nng_ctx_setopt_bool()`
+This function is for options which take a boolean (`bool`).
+The _bval_ is passed to the option.
+
+==== `nng_ctx_setopt_int()`
+This function is for options which take an integer (`int`).
+The _ival_ is passed to the option.
+
+==== `nng_ctx_setopt_ms()`
+This function is used to configure time durations (such as timeouts) using
+type <<nng_duration.5#,`nng_duration`>>.
+The duration _dur_ is an integer number of milliseconds.
+
+==== `nng_ctx_setopt_size()`
+This function is used to configure a size, _z_, typically for buffer sizes,
+message maximum sizes, and similar options.
+
+==== `nng_ctx_setopt_string()`
+This function is used to pass configure a string, _str_.
+Strings passed this way must be legal UTF-8 or ASCII strings, terminated
+with a `NUL` (`\0`) byte.
+(Other constraints may apply as well, see the documentation for each option
+for details.)
+
+==== `nng_ctx_setopt_uint64()`
+This function is used to configure a 64-bit unsigned value, _u64_.
+This is typically used for options related to identifiers, network numbers,
+and similar.
+
+== RETURN VALUES
+
+These functions return 0 on success, and non-zero otherwise.
+
+== ERRORS
+
+`NNG_ECLOSED`:: Parameter _s_ does not refer to an open socket.
+`NNG_EINVAL`:: The value being passed is invalid.
+`NNG_ENOTSUP`:: The option _opt_ is not supported.
+`NNG_EREADONLY`:: The option _opt_ is read-only.
+`NNG_ESTATE`:: The socket is in an inappropriate state for setting this option.
+
+== SEE ALSO
+
+<<nng_ctx_getopt.3#,nng_ctx_getopt(3)>>,
+<<nng_setopt.3#,nng_setopt(3)>>,
+<<nng_strerror.3#,nng_strerror(3)>>,
+<<nng_ctx.5#,nng_ctx(5)>>,
+<<nng_options.5#,nng_options(5)>>,
+<<nng_socket.5#,nng_socket(5)>>,
+<<nng.7#,nng(7)>>
-- 
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