-.. This work is licensed under a Creative Commons Attribution 4.0 International License.
-.. SPDX-License-Identifier: CC-BY-4.0
-.. CAUTION: this document is generated from source in doc/src/rtd.
-.. To make changes edit the source and recompile the document.
-.. Do NOT make changes directly to .rst or .md files.
-
-============================================================================================
-Man Page: rmr_torcv_msg
-============================================================================================
-
-
+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. SPDX-License-Identifier: CC-BY-4.0
+.. CAUTION: this document is generated from source in doc/src/rtd.
+.. To make changes edit the source and recompile the document.
+.. Do NOT make changes directly to .rst or .md files.
+
+============================================================================================
+Man Page: rmr_torcv_msg
+============================================================================================
+
+
RMR LIBRARY FUNCTIONS
NAME
----
-rmr_torcv_msg
+rmr_torcv_msg
SYNOPSIS
--------
-
-::
-
- #include <rmr/rmr.h>
-
- rmr_mbuf_t* rmr_torcv_msg( void* vctx, rmr_mbuf_t* old_msg, int ms_to );
-
+
+::
+
+ #include <rmr/rmr.h>
+
+ rmr_mbuf_t* rmr_torcv_msg( void* vctx, rmr_mbuf_t* old_msg, int ms_to );
+
DESCRIPTION
-----------
-The ``rmr_torcv_msg`` function will pause for *ms_to*
-milliseconds waiting for a message to arrive. If a message
-arrives before the timeout expires the message buffer
-returned will have a status of RMR_OK and the payload will
-contain the data received. If the timeout expires before the
-message is received, the status will have the value
-RMR_ERR_TIMEOUT. When a received message is returned the
-message buffer will also contain the message type and length
-set by the sender. If messages were queued while waiting for
-the response to a previous invocation of ``rmr_call,`` the
-oldest message is removed from the queue and returned without
-delay.
-
-The *vctx* pointer is the pointer returned by the
-``rmr_init`` function. *Old_msg* is a pointer to a previously
-used message buffer or NULL. The ability to reuse message
-buffers helps to avoid alloc/free cycles in the user
-application. When no buffer is available to supply, the
-receive function will allocate one.
+The ``rmr_torcv_msg`` function will pause for *ms_to*
+milliseconds waiting for a message to arrive. If a message
+arrives before the timeout expires the message buffer
+returned will have a status of RMR_OK and the payload will
+contain the data received. If the timeout expires before the
+message is received, the status will have the value
+RMR_ERR_TIMEOUT. When a received message is returned the
+message buffer will also contain the message type and length
+set by the sender. If messages were queued while waiting for
+the response to a previous invocation of ``rmr_call,`` the
+oldest message is removed from the queue and returned without
+delay.
+
+The *vctx* pointer is the pointer returned by the
+``rmr_init`` function. *Old_msg* is a pointer to a previously
+used message buffer or NULL. The ability to reuse message
+buffers helps to avoid alloc/free cycles in the user
+application. When no buffer is available to supply, the
+receive function will allocate one.
RETURN VALUE
------------
-The function returns a pointer to the ``rmr_mbuf_t``
-structure which references the message information (state,
-length, payload), or a nil pointer in the case of an extreme
-error.
+The function returns a pointer to the ``rmr_mbuf_t``
+structure which references the message information (state,
+length, payload), or a nil pointer in the case of an extreme
+error.
ERRORS
------
-The *state* field in the message buffer will be one of the
-following:
-
-
- .. list-table::
- :widths: auto
- :header-rows: 0
- :class: borderless
-
- * - **RMR_OK**
- -
- The message buffer (payload) references the received data.
-
- * - **RMR_ERR_INITFAILED**
- -
- The first call to this function must initialise an underlying
- system notification mechanism. On failure, this error is
- returned and errno will have the system error status set. If
- this function fails to initialise, the poll mechanism, it is
- likely that message receives will never be successful.
-
- * - **RMR_ERR_TIMEOUT**
- -
- The timeout expired before a complete message was received.
- All other fields in the message buffer are not valid.
-
- * - **RMR_ERR_EMPTY**
- -
- A message was received, but it had no payload. All other
- fields in the message buffer are not valid.
-
-
-Upon return the system error number, *errno* might be set
-with a value that can help to explain the meaning of the
-state indicated in the message. The following are possible:
-
- .. list-table::
- :widths: auto
- :header-rows: 0
- :class: borderless
-
- * - **INVAL**
- -
- Parameter(s) passed to the function were not valid.
-
- * - **EBADF**
- -
- The underlying message transport is unable to process the
- request.
-
- * - **ENOTSUP**
- -
- The underlying message transport is unable to process the
- request.
-
- * - **EFSM**
- -
- The underlying message transport is unable to process the
- request.
-
- * - **EAGAIN**
- -
- The underlying message transport is unable to process the
- request.
-
- * - **EINTR**
- -
- The underlying message transport is unable to process the
- request.
-
- * - **ETIMEDOUT**
- -
- The underlying message transport is unable to process the
- request.
-
- * - **ETERM**
- -
- The underlying message transport is unable to process the
- request.
-
-
+The *state* field in the message buffer will be one of the
+following:
+
+
+ .. list-table::
+ :widths: auto
+ :header-rows: 0
+ :class: borderless
+
+ * - **RMR_OK**
+ -
+ The message buffer (payload) references the received data.
+
+ * - **RMR_ERR_INITFAILED**
+ -
+ The first call to this function must initialise an underlying
+ system notification mechanism. On failure, this error is
+ returned and errno will have the system error status set. If
+ this function fails to initialise, the poll mechanism, it is
+ likely that message receives will never be successful.
+
+ * - **RMR_ERR_TIMEOUT**
+ -
+ The timeout expired before a complete message was received.
+ All other fields in the message buffer are not valid.
+
+ * - **RMR_ERR_EMPTY**
+ -
+ A message was received, but it had no payload. All other
+ fields in the message buffer are not valid.
+
+
+Upon return the system error number, *errno* might be set
+with a value that can help to explain the meaning of the
+state indicated in the message. The following are possible:
+
+ .. list-table::
+ :widths: auto
+ :header-rows: 0
+ :class: borderless
+
+ * - **INVAL**
+ -
+ Parameter(s) passed to the function were not valid.
+
+ * - **EBADF**
+ -
+ The underlying message transport is unable to process the
+ request.
+
+ * - **ENOTSUP**
+ -
+ The underlying message transport is unable to process the
+ request.
+
+ * - **EFSM**
+ -
+ The underlying message transport is unable to process the
+ request.
+
+ * - **EAGAIN**
+ -
+ The underlying message transport is unable to process the
+ request.
+
+ * - **EINTR**
+ -
+ The underlying message transport is unable to process the
+ request.
+
+ * - **ETIMEDOUT**
+ -
+ The underlying message transport is unable to process the
+ request.
+
+ * - **ETERM**
+ -
+ The underlying message transport is unable to process the
+ request.
+
+
EXAMPLE
SEE ALSO
--------
-rmr_alloc_msg(3), rmr_call(3), rmr_free_msg(3),
-rmr_get_rcvfd(3), rmr_init(3), rmr_payload_size(3),
-rmr_rcv_msg(3), rmr_send_msg(3), rmr_rcv_specific(3),
-rmr_rts_msg(3), rmr_ready(3), rmr_fib(3), rmr_has_str(3),
-rmr_tokenise(3), rmr_mk_ring(3), rmr_ring_free(3)
+rmr_alloc_msg(3), rmr_call(3), rmr_free_msg(3),
+rmr_get_rcvfd(3), rmr_init(3), rmr_payload_size(3),
+rmr_rcv_msg(3), rmr_send_msg(3), rmr_rcv_specific(3),
+rmr_rts_msg(3), rmr_ready(3), rmr_fib(3), rmr_has_str(3),
+rmr_tokenise(3), rmr_mk_ring(3), rmr_ring_free(3)
Code Review / ric-plt / lib / rmr.git / blobdiff