| Commit message (Collapse) | Author | Age |
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Although the previous commit should make it very unlikely we screw up the
subscription sharding, be defensive about waiting for SERVACKs. ZSubscribeTo
does mess up, Z_SendFragmentedNotice will shard with a z_multiuid. In that
case, although the second packet will get a SERVACK, Z_ReadWait kindly drops it
on the floor. The ZIfNotice will then just hang.
Tested by bumping zwgc's BATCH_SIZE up to 200, reverting the previous commit,
and strace.
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Header lengths are not constant-size because Zcode escapes bytes 0xFF and 0x00
into two bytes. If we end up filling up close to all the space we have and
Z_SendFragmentedNotice then computes a header length larger than ours by
enough, the message gets fragmented.
Getting it fragmented is especially unfortunate because only the first of a
fragmented notice ever has a SERVACK survive. (They all get SERVACKs, but
libzephyr kindly drops all but the first on the floor.)
This isn't a watertight fix; we may get really really unlucky and blow up 13
bytes in the authenticator and checksum. But that's not likely, and a proper
fix would involve either computing based on the maximum possible authenticator
size (wasteful and hard to bound tightly) or changing to protocol to use a less
inappropriate encoding.
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With a custom send_routine that mirrors ZSrvSendList. This allows for an
asynchronous version that replaces send_routine with non-blocking versions (and
waits for ACKs out-of-band).
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It's only used by ZCancelSubscription, but the server rejects unauthenticated
CLIENT_CANCELSUB requests anyway. The unauthenticated codepath results in a
SERVNAK and doesn't drop subs.
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Provide a new zctl subcommand, flush_subs, to flush all subscriptions for
a specified recipient. This is implemented using a new library function,
ZFlushUserSubscriptions().
This is the client side of #103
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detailed change information.
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These are declared in <zephyr/zephyr_conf.h> to be either the BSD routine
or the ANSI routines, depending on the system type.
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Z_Subscriptions with nitems=0; that's how ZCancelSubs works-
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subscriptions are not split across packet boundaries
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David Benjamin
Jeffrey Hutzelman
Karl Ramm
Greg Hudson
Richard Basch
Lucien Van Elsen
John F. Carr
John Kohl
Robert S. French