In case of EAI_SYSTEM, getaddrinfo is supposed to set more detail in
errno; however, because we call getaddrinfo on a thread now, and errno
is threadlocal, that information is being lost. Instead, we just raise
whatever errno happens to be on the calling thread (which can be
something very confusing, like `ECHILD`).
Fix it by explicitly propagating errno back to the calling thread
through the getaddrinfo_arg structure.
[Bug #20198]
ASAN leaves a pointer to the fake frame on the stack; we can use the
__asan_addr_is_in_fake_stack API to work out the extent of the fake
stack and thus mark any VALUEs contained therein.
[Bug #20001]
ASAN leaves a pointer to the fake frame on the stack; we can use the
__asan_addr_is_in_fake_stack API to work out the extent of the fake
stack and thus mark any VALUEs contained therein.
[Bug #20001]
It looks like `sched_getcpu(3)` returns a strange number on some
(virtual?) environments.
I decided to remove the setaffinity mechanism because the performance
does not appear to degrade on a quick benchmark even if removed.
[Bug #20172]
This reverts commit cbda94edd8, because
`:nodoc:` does not work for constants.
In the case of `rb_define_const`, RDoc parses the preceeding comment
as in `"/* definition: comment */"` form.
This _partially_ reverts commit
d2ba8ea54a, but for UDP sockets only.
With TCP sockets (and other things which use `rsock_init_inetsock`), the
order of operations is to call `getaddrinfo(3)` with AF_UNSPEC, look at
the returned addresses, pick one, and then call `socket(2)` with the
family for that address (i.e. AF_INET or AF_INET6).
With UDP sockets, however, this is reversed; `UDPSocket.new` takes an
address family as an argument, and then calls `socket(2)` with that
family. A subsequent call to UDPSocket#connect will then call
`getaddrinfo(3)` with that family.
The problem here is that...
* If you are in a networking situation that _only_ has loopback addrs,
* And you want to look up a name like "localhost" (or NULL)
* And you pass AF_INET or AF_INET6 as the ai_family argument to
getaddrinfo(3),
* And you pass AI_ADDRCONFIG to the hints argument as well,
then glibc on Linux will not return an address. This is because
AI_ADDRCONFIG is supposed to return addresses for families we actually
have an address for and could conceivably connect to, but also is
documented to explicitly ignore localhost in that situation.
It honestly doesn't make a ton of sense to pass AI_ADDRCONFIG if you're
explicitly passing the address family anyway, because you're not looking
for "an address for this name we can connect to"; you're looking for "an
IPv(4|6) address for this name". And the original glibc bug that
d2ba8ea5 was supposed to work around was related to parallel issuance of
A and AAAA queries, which of course won't happen if an address family is
explicitly specified.
So, we fix this by not passing AI_ADDRCONFIG for calls to
`rsock_addrinfo` that we also pass an explicit family to (i.e. for
UDPsocket).
[Bug #20048]
Our current implementation of rb_postponed_job_register suffers from
some safety issues that can lead to interpreter crashes (see bug #1991).
Essentially, the issue is that jobs can be called with the wrong
arguments.
We made two attempts to fix this whilst keeping the promised semantics,
but:
* The first one involved masking/unmasking when flushing jobs, which
was believed to be too expensive
* The second one involved a lock-free, multi-producer, single-consumer
ringbuffer, which was too complex
The critical insight behind this third solution is that essentially the
only user of these APIs are a) internal, or b) profiling gems.
For a), none of the usages actually require variable data; they will
work just fine with the preregistration interface.
For b), generally profiling gems only call a single callback with a
single piece of data (which is actually usually just zero) for the life
of the program. The ringbuffer is complex because it needs to support
multi-word inserts of job & data (which can't be atomic); but nobody
actually even needs that functionality, really.
So, this comit:
* Introduces a pre-registration API for jobs, with a GVL-requiring
rb_postponed_job_prereigster, which returns a handle which can be
used with an async-signal-safe rb_postponed_job_trigger.
* Deprecates rb_postponed_job_register (and re-implements it on top of
the preregister function for compatability)
* Moves all the internal usages of postponed job register
pre-registration
When making an outgoing TCP or UDP connection, set AI_ADDRCONFIG in the
hints we send to getaddrinfo(3) (if supported). This will prompt the
resolver to _NOT_ issue A or AAAA queries if the system does not
actually have an IPv4 or IPv6 address (respectively).
This makes outgoing connections marginally more efficient on
non-dual-stack systems, since we don't have to try connecting to an
address which can't possibly work.
More importantly, however, this works around a race condition present
in some older versions of glibc on aarch64 where it could accidently
send the two outgoing DNS queries with the same DNS txnid, and get
confused when receiving the responses. This manifests as outgoing
connections sometimes taking 5 seconds (the DNS timeout before retry) to
be made.
Fixes#19144
According to https://bugs.openjdk.org/browse/JDK-8268605, pthread_create
may fail spuriously. This change implements a simple retry as a modest
measure, which is also used by JDK.
After a pthread for getaddrinfo is detached, we cannot predict when the
thread will exit. It would lead to a segfault by setting
pthread_setaffinity to the terminated pthread. I guess this problem
would be more likely to occur in high-load environments.
This change detaches the pthread after pthread_setaffinity is called.
[Feature #19965]
When pthread_create is available, rb_getaddrinfo creates a pthread and
executes getaddrinfo(3) in it. The caller thread waits for the pthread
to complete, but detaches it if interrupted. This allows name resolution
to be interuppted by Timeout.timeout, etc. even if it takes a long time
(for example, when the DNS server does not respond). [Feature #19965]
[Bug #19012]
man recvmsg(2) states:
> Return Value
> These calls return the number of bytes received, or -1 if an error occurred.
> The return value will be 0 when the peer has performed an orderly shutdown.
Not too sure how one is supposed to make the difference between a packet of
size 0 and a closed connection.
According to the C99 specification section 7.20.3.2 paragraph 2:
> If ptr is a null pointer, no action occurs.
So we do not need to check that the pointer is a null pointer.
Introduce Universal Parser mode for the parser.
This commit includes these changes:
* Introduce `UNIVERSAL_PARSER` macro. All of CRuby related functions
are passed via `struct rb_parser_config_struct` when this macro is enabled.
* Add CI task with 'cppflags=-DUNIVERSAL_PARSER' for ubuntu.
The socket extensions rubysocket.h pulls in the "private" include/gc.h,
which now depends on vm_core.h. vm_core.h pulls in id.h
when tool/update-deps generates the dependencies for the makefiles, it
generates the line for id.h to be based on VPATH, which is configured in
the extconf.rb for each of the extensions. By default VPATH does not
include the actual source directory of the current Ruby so the
dependency fails to resolve and linking fails.
We need to append the topdir and top_srcdir to VPATH to have the
dependancy picked up correctly (and I believe we need both of these to
cope with in-tree and out-of-tree builds).
I copied this from the approach taken in
https://github.com/ruby/ruby/blob/master/ext/objspace/extconf.rb#L3
