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authorGarrett D'Amore <garrett@damore.org>2024-03-24 13:36:51 -0700
committerGarrett D'Amore <garrett@damore.org>2024-03-24 13:36:51 -0700
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-= nng_ctx_get(3)
-//
-// Copyright 2019 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_get - get context option
-
-== SYNOPSIS
-
-[source, c]
-----
-#include <nng/nng.h>
-
-int nng_ctx_get(nng_ctx ctx, const char *opt, void *val, size_t *valszp);
-
-int nng_ctx_get_bool(nng_ctx ctx, const char *opt, bool *bvalp);
-
-int nng_ctx_get_int(nng_ctx ctx, const char *opt, int *ivalp);
-
-int nng_ctx_get_ms(nng_ctx ctx, const char *opt, nng_duration *durp);
-
-int nng_ctx_get_size(nng_ctx ctx, const char *opt, size_t *zp);
-
-int nng_ctx_get_string(nng_ctx ctx, const char *opt, char **strp);
-
-int nng_ctx_get_uint64(nng_ctx ctx, const char *opt, uint64_t *u64p);
-
-----
-
-== DESCRIPTION
-
-(((options, context)))
-The `nng_ctx_get()` functions are used to retrieve option values for
-the xref:nng_ctx.5.adoc[context] _ctx_.
-The actual options that may be retrieved in this way vary.
-A number of them are documented in xref:nng_options.5.adoc[nng_options(5)].
-
-NOTE: Context options are protocol specific.
-The details will be documented with the protocol.
-
-=== Forms
-
-In all of these forms, the option _opt_ is retrieved from the context _ctx_.
-The forms vary based on the type of the option they take.
-
-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.
-
-`nng_ctx_get()`::
-This function is untyped and can be used to retrieve the value of any option.
-The caller must store a pointer to a buffer to receive the value in _val_,
-and the size of the buffer shall be stored at the location referenced by
-_valszp_. +
- +
-When the function returns, the actual size of the data copied (or that
-would have been copied if sufficient space were present) is stored at
-the location referenced by _valszp_.
-If the caller's buffer is not large enough to hold the entire object,
-then the copy is truncated.
-Therefore the caller should check for truncation by verifying that the
-returned size in _valszp_ does not exceed the original buffer size. +
- +
-It is acceptable to pass `NULL` for _val_ if the value in _valszp_ is zero.
-This can be used to determine the size of the buffer needed to receive
-the object.
-
-TIP: It may be easier to use one of the typed forms of this function.
-
-`nng_ctx_get_bool()`::
-This function is for options which take a Boolean (`bool`).
-The value will be stored at _ivalp_.
-
-`nng_ctx_get_int()`::
-This function is for options which take an integer (`int`).
-The value will be stored at _ivalp_.
-
-`nng_ctx_get_ms()`::
-This function is used to retrieve time xref:nng_duration.5.adoc[durations]
-(such as timeouts), stored in _durp_ as a number of milliseconds.
-(The special value ((`NNG_DURATION_INFINITE`)) means an infinite amount of time, and
-the special value ((`NNG_DURATION_DEFAULT`)) means a context-specific default.)
-
-`nng_ctx_get_size()`::
-This function is used to retrieve a size into the pointer _zp_,
-typically for buffer sizes, message maximum sizes, and similar options.
-
-`nng_ctx_get_string()`::
-This function is used to retrieve a string into _strp_.
-This string is created from the source using xref:nng_strdup.3.adoc[`nng_strdup()`]
-and consequently must be freed by the caller using
-xref:nng_strfree.3.adoc[`nng_strfree()`] when it is no longer needed.
-
-`nng_ctx_get_uint64()`::
-This function is used to retrieve a 64-bit unsigned value into the value
-referenced by _u64p_.
-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
-
-[horizontal]
-`NNG_EBADTYPE`:: Incorrect type for option.
-`NNG_ECLOSED`:: Parameter _s_ does not refer to an open socket.
-`NNG_EINVAL`:: Size of destination _val_ too small for object.
-`NNG_ENOMEM`:: Insufficient memory exists.
-`NNG_ENOTSUP`:: The option _opt_ is not supported.
-`NNG_EWRITEONLY`:: The option _opt_ is write-only.
-
-== SEE ALSO
-
-[.text-left]
-xref:nng_ctx_set.3.adoc[nng_ctx_set(3)],
-xref:nng_strdup.3.adoc[nng_strdup(3)],
-xref:nng_strerror.3.adoc[nng_strerror(3)],
-xref:nng_strfree.3.adoc[nng_strfree(3)],
-xref:nng_duration.5.adoc[nng_duration(5)],
-xref:nng_ctx.5.adoc[nng_ctx(5)],
-xref:nng_options.5.adoc[nng_options(5)],
-xref:nng.7.adoc[nng(7)]