docs/rmr_get_srcip.3.rst

 
 
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============================================================================================ 
Man Page: rmr_get_srcip 
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RMR Library Functions 
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NAME 
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rmr_get_srcip 
 
SYNOPSIS 
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:: 
  
 #include <rmr/rmr.h>
 unsigned char* rmr_get_srcip( rmr_mbuf_t* mbuf, unsigned char* dest )
 
 
 
DESCRIPTION 
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The rmr_get_srcip function will copy the *source IP address* 
from the message to a buffer (dest) supplied by the user. In 
an RMr message, the source IP address is the sender's 
information that is used for return to sender function calls; 
this function makes it available to the user application. The 
address is maintained as IP:port where *IP* could be either 
an IPv6 or IPv4 address depending on what was provided by the 
sending application. 
 
The maximum size allowed by RMr is 64 bytes (including the 
nil string terminator), so the user must ensure that the 
destination buffer given is at least 64 bytes. The user 
application should use the RMr constant RMR_MAX_SRC to ensure 
that the buffer supplied is large enough, and to protect 
against future RMr enhancements which might increase the 
address buffer size requirement. 
 
RETURN VALUE 
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On success, a pointer to the destination buffer is given as a 
convenience to the user programme. On failure, a nil pointer 
is returned and the value of errno is set. 
 
ERRORS 
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If an error occurs, the value of the global variable errno 
will be set to one of the following with the indicated 
meaning. 
 
 
 
EINVAL 
   
  The message, or an internal portion of the message, was 
  corrupted or the pointer was invalid. 
 
 
SEE ALSO 
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rmr_alloc_msg(3), rmr_bytes2xact(3), rmr_bytes2meid(3), 
rmr_call(3), rmr_free_msg(3), rmr_get_rcvfd(3), 
rmr_get_src(3), rmr_payload_size(3), rmr_send_msg(3), 
rmr_rcv_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_str2meid(3), 
rmr_str2xact(3), rmr_wh_open(3), rmr_wh_send_msg(3)