SP_GET_MEMB_INFO(3) User Manuals SP_GET_MEMB_INFO(3)NAME
SP_get_memb_info, SP_scat_get_memb_info - Extract membership informa‐
tion from message
SYNOPSIS
#include <sp.h>
int SP_get_memb_info( const char * memb_mess, const service ser‐
vice_type, membership_info *memb_info);
int SP_scat_get_memb_info( const scatter * memb_mess_scat, const ser‐
vice service_type, membership_info *memb_info);
DESCRIPTIONSP_get_memb_info and its scatter variant all parse the contents of a
message body that is received as part of a membership message and fill
in the membership_info struct that is passed in as a parameter.
The service_type and the memb_mess fields should be the same as the
values returned in a previous SP_receive call for a membership message.
The caller should allocate a new membership_info structure and pass
that into this function. When the function returns the structure will
be filled in.
The fields of a membership_info struct include
group_id gid
char changed_member[MAX_GROUP_NAME]
unsigned int num_vs_set
vs_set_info my_vs_set
The changed_member field is filled in with the name of the new or leav‐
ing member if the membership is a Join, Leave or Disconnect. If it is a
Network membership event then the changed_member field is blank and
multiple vs_sets will be available with all of the subsets of daemons
coming together into the new membership.
The my_vs_set field stores the number of members of my local vs set,
i.e. those processes who came together with me and the location of the
list of members. See SP_get_vs_set_members for how to extract the full
list of members. The SP_get_vs_sets_info function will return the full
list of all VS sets that arrived with this membership message.
RETURN VALUES
Returns a postivive value on success or one of the following errors ( <
0 ):
ILLEGAL_MESSAGE
The message had an illegal structure, like a scatter not filled
out correctly. Or it is not a membership message.
BUGS
None.
AUTHOR
Yair Amir <yairamir@cnds.jhu.edu>
Jonathan Stanton <jonathan@cnds.jhu.edu>
SEE ALSOlibspread(3)SPREAD February 2006 SP_GET_MEMB_INFO(3)
