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+ 
+ 
+.. 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 
+ 
+SYNOPSIS 
+-------------------------------------------------------------------------------------------- 
+ 
+ 
+:: 
+  
+ #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. 
+ 
+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. 
+ 
+ERRORS 
+-------------------------------------------------------------------------------------------- 
+ 
+The *state* field in the message buffer will be one of the 
+following: 
+ 
+ 
+ 
+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 intialise, the poll 
+  mechansim, 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. 
+ 
+ 
+ 
+ 
+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)