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Group the PPTP starting and active statistics in struct pptp_stat_t and keep the storage under the PPTP server object instead of exposing writable stat_* globals. This keeps ownership inside the PPTP control code while preserving the existing CLI and ACCEL-PPP-MIB counter semantics.
Route counter updates through pptp_stat_*() helpers. Connection setup, transition to PPP, and teardown paths no longer open-code individual counter increments/decrements; the update policy now lives beside the PPTP-owned storage and uses relaxed atomic operations for the simple state counters.
Make the CLI show-stat path render from a local snapshot and convert the PPTP SNMP starting/active scalars from watched raw pointers to scalar handlers. SNMP now reads through pptp_stat_starting() and pptp_stat_active(), removing the old pptp_get_stat() pointer escape hatch.
Signed-off-by: Denys Fedoryshchenko <denys.f@collabora.com>
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