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authorGarrett D'Amore <garrett@damore.org>2018-11-08 20:05:54 -0800
committerGarrett D'Amore <garrett@damore.org>2018-11-08 20:05:54 -0800
commit848dbfced3491a01ff69fff9770a6c1dcd5cb112 (patch)
tree9c0235f6a7558b609cc4a06ab00b71eb330a9e4a /docs/man/nng_pipe_getopt.3.adoc
parenteee06b8b71fc4f703d6582110d67b3fe3a0c7b22 (diff)
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Improved layout and wording of option accessor functions.
Diffstat (limited to 'docs/man/nng_pipe_getopt.3.adoc')
-rw-r--r--docs/man/nng_pipe_getopt.3.adoc41
1 files changed, 16 insertions, 25 deletions
diff --git a/docs/man/nng_pipe_getopt.3.adoc b/docs/man/nng_pipe_getopt.3.adoc
index 5fc3a1ce..9bc7529e 100644
--- a/docs/man/nng_pipe_getopt.3.adoc
+++ b/docs/man/nng_pipe_getopt.3.adoc
@@ -48,9 +48,8 @@ vary, and many are documented in <<nng_options.5#,nng_options(5)>>.
Additionally some transport-specific options and protocol-specific options are
documented with the transports and protocols themselves.
-NOTE: All "`options`" on a pipe are read-only values, and intended to
-facilitate understanding the identity of an associated peer.
-Modification of options must be done on the listener or dialer using either
+NOTE: All "`options`" on a pipe are read-only values.
+Modification of options may be done before the pipe is created using
`<<nng_listener_setopt.3#,nng_listener_setopt()>>` or
`<<nng_dialer_getopt.3#,nng_dialer_setopt()>>`.
@@ -64,67 +63,59 @@ In all of these forms, the option _opt_ is retrieved from the pipe _p_.
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_pipe_getopt()`
-
+`nng_pipe_getopt()`::
This is untyped, and can be used to retrieve the value of any option.
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_.
-
+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
-size returned in _valszp_ does not exceed the original buffer size.
-
+size returned 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: Generally, it will be easier to use one of the typed forms instead.
-
-==== `nng_pipe_getopt_bool()`
+TIP: It may be easier to use one of the typed forms of this function.
+`nng_pipe_getopt_bool()`::
This function is for options which take a Boolean (`bool`).
The value will be stored at _bvalp_.
-==== `nng_pipe_getopt_int()`
-
+`nng_pipe_getopt_int()`::
This function is for options which take an integer (`int`).
The value will be stored at _ivalp_.
-==== `nng_pipe_getopt_ms()`
-
+`nng_pipe_getopt_ms()`::
This function is used to retrieve time durations
(`<<nng_duration.5#,nng_duration>>`) in milliseconds, which are stored in
_durp_.
-==== `nng_pipe_getopt_ptr()`
+`nng_pipe_getopt_ptr()`::
This function is used to retrieve a pointer, _ptr_, to structured data.
The data referenced by _ptr_ is generally managed using other functions.
Note that this form is somewhat special in that the object is generally
not copied, but instead the *pointer* to the object is copied.
-==== `nng_pipe_getopt_size()`
-
+`nng_pipe_getopt_size()`::
This function is used to retrieve a size into the pointer _zp_,
typically for buffer sizes, message maximum sizes, and similar options.
-==== `nng_pipe_getopt_sockaddr()`
-
+`nng_pipe_getopt_sockaddr()`::
This function is used to retrieve an `<<nng_sockaddr.5#,nng_sockaddr>>`
into _sap_.
-==== `nng_pipe_getopt_string()`
-
+`nng_pipe_getopt_string()`::
This function is used to retrieve a string into _strp_.
This string is created from the source using `<<nng_strdup.3#,nng_strdup()>>`
and consequently must be freed by the caller using
`<<nng_strfree.3#,nng_strfree()>>` when it is no longer needed.
-==== `nng_pipe_getopt_uint64()`
-
+`nng_pipe_getopt_uint64()`::
This function is used to retrieve a 64-bit unsigned value into the value
referenced by _u64p_.
This is typically used for options