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This port has support for both non-smp and smp.
It contains a new way to do io checking in which erts_poll_wait
receives the payload of the polled entity. This has implications
for all linked-in drivers.
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config.h defines HAVE_SYSLOG_H whereas the sources are looking for
NO_SYSLOG to be undefined. As the logic of "if feature is available"
makes more sense than "if feature is not unavailable", I opted for the
config.h define.
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The first argument g->max_conn to select() in epmd_srv.c seems to be
wrong as it excludes the listening socket(s). Instead we keep track of
the highest fd seen.
However I still don't understand why select() started to fail for
vxworks with R14B03 when the feature of more than one listening socket
was introduced. The default is still 1 listening socket (num_sockets=1),
which would make the first argument to select() unchanged.
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The IP address(es) epmd binds to can now be specified by the user,
either via epmd's new "-address" option or (if that's not used) by
setting the environment variable ERL_EPMD_ADDRESS. Multiple addresses
may be specified using a comma-separated list. If the loopback address
is not in this list, it will be added implicitly, so that the daemon can
be queried by an interactive epmd process.
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Use erts_(v)snprintf to ensure no buffer overruns in debug printouts.
Disallow everything except port and name requests from remote nodes.
Disallow kill command even from localhost if alive nodes exist.
-relaxed_command_check when starting epmd returns the possibility to
kill this epmd when nodes are alive (from localhost).
Disallow stop command completely except if -relaxed_command_check is given
when epmd was started.
Environment variable ERL_EPMD_RELAXED_COMMAND_CHECK can be set to always get
-relaxed_command_check.
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Check errno if either select() or accept() returns an error and exit.
This prevents epmd from looping and taking up 100% CPU.
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Modify IPv6 variants of SET_ADDR_LOOPBACK and SET_ADDR_ANY to use
in6addr_loopback and in6addr_any.
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* kj/epmd-port2resp-trunc-extra:
Handle "extra" field according to specs in ALIVE2_REQ and PORT2_RESP.
OTP-8361 EPMD now correctly handles the extra data field which can be
given in the ALIVE2_REQ request and retrieved in the PORT2_RESP
response. (Thanks to Klas Johansson.)
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Don't let the length field pollute the value of the "extra" field in
ALIVE2_REQ. Extra was read, starting at the second byte of the two
byte length field, which meant that it was included in the result and
the last byte of the value was skipped:
if "extra" is <<1, 2>>, return <<0, 2, 1, 2>> not <<0, 2, 2, 1>>
Increment the offset correctly when sending PORT2_RESP, in order to
make sure the "extra" field won't be truncated:
if "extra" is <<>>, return <<0, 0>> not <<0>>
if "extra" is <<1, 2>>, return <<0, 2, 1, 2>> not <<0, 2, 1>>
Allow null characters in "extra".
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