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How the backend knows it's being searched by syncprov?

hyc@OpenLDAP.org wrote:

Update of /repo/OpenLDAP/pkg/ldap/servers/slapd/overlays

Modified Files:
syncprov.c 1.24 -> 1.25


to use syncprov on top of back-sql, I need the backend to know it's being searched for sync replication purposes when filtering for CSN. To this end, I added a function slap_find_control_id() that returns the cid for a given control oid; then, to determine if a search is performed for syncrepl purposes, I'd use

       slap_find_control_id( LDAP_CONTROL_SYNC, &sync_cid );

to grab the control's cid at initialization and, when requested to filter for CSN, I'd test (op->o_controls[sync_cid]).
sync_cid could be a back-sql wide static variable, initialized to -1 and grabbed, for instance, at bi_open(); or it could
even be global scoped, in case other backends need to be syncrepl-aware.

Do you think this is correct?

Ciao, Ando.

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