Port `event_rpcgen.py` and `test/check-dumpevents.py` to Python 3.

These scripts remain compatible with Python 2.

(cherry picked from commit 8b0aa7b36a3250fad4953f194c8a94ab25032583)

test: run different tests under different options (in a wrapper)

test: run regress with EVENT_DEBUG_MODE=1 and without

This could show some bugs like "event_assign called on an already added event",
and some others that debugging mode could track.

Implemented EV_CLOSED event for epoll backend (EPOLLRDHUP).

- Added new EV_CLOSED event - detects premature connection close
by clients without the necessity of reading all the pending
data. Doe

Implemented EV_CLOSED event for epoll backend (EPOLLRDHUP).

- Added new EV_CLOSED event - detects premature connection close
by clients without the necessity of reading all the pending
data. Does not depend on EV_READ and/or EV_WRITE.

- Added new EV_FEATURE_EARLY_CLOSED feature for epoll.
Must be supported for listening to EV_CLOSED event.

- Added new regression test: test-closed.c

- All regression tests passed (test/regress and test/test.sh)

- strace output of test-closed using EV_CLOSED:
socketpair(PF_LOCAL, SOCK_STREAM, 0, [6, 7]) = 0
sendto(6, "test string\0", 12, 0, NULL, 0) = 12
shutdown(6, SHUT_WR) = 0
epoll_ctl(3, EPOLL_CTL_ADD, 7, {EPOLLRDHUP, {u32=7, u64=7}}) = 0
epoll_wait(3, {{EPOLLRDHUP, {u32=7, u64=7}}}, 32, 3000) = 1
epoll_ctl(3, EPOLL_CTL_MOD, 7, {EPOLLRDHUP, {u32=7, u64=7}}) = 0
fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 4), ...})
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYM...
write(1, "closed_cb: detected connection close "..., 45) = 45

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Fix a bug in fixing a bug in out-of-tree test-dumpevents

Fix some out-of-tree build bugs

Fix a bug when running "make verify" out-of-tree

Use python2 rather than python

python may refer to either python2 or python3 so rather by explicit by
using python2.
See PEP 394 - http://www.python.org/dev/peps/pep-0394/ for more
details.

Avoid test -e; older shs don't have one.

Reported by Paul Croome.

Report forwarded by Dave Hart.

Make all tests that hit the network disabled by default

To run only these tests, run test/regress with @live_net. To run all
tests, run test/regress with @all.

When PRECISE_TIMERS is set with epoll, use timerfd for microsecond precision

The epoll interface ordinarily gives us one-millisecond
precision, so on Linux it makes perfect sense to use the
CLOCK_MO

When PRECISE_TIMERS is set with epoll, use timerfd for microsecond precision

The epoll interface ordinarily gives us one-millisecond
precision, so on Linux it makes perfect sense to use the
CLOCK_MONOTONIC_COARSE timer. But when the user has set the new
PRECISE_TIMER flag for an event_base (either by the
EVENT_BASE_FLAG_PRECISE_TIMER flag, or by the EVENT_PRECISE_TIMER
environment variable), they presumably want finer granularity.

On not-too-old Linuxes, we can achieve this using the Timerfd
mechanism, which accepts nanosecond granularity and understands
posix clocks. It's a little more expensive than just calling
epoll_wait(), so we won't do it by default.

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Simplify test.sh code significantly.

Also make it easier to add new tests/backends.

Make check-dumpevents work with out-of-tree builds

Require at least Python 2.4 for check-dumpevents.py.

Add a unit test for event_base_dump_events()

This function uses a C program to generate its output, and then uses a
Python program to check it for correctness. On systems without
Python, we just ma

Add a unit test for event_base_dump_events()

This function uses a C program to generate its output, and then uses a
Python program to check it for correctness. On systems without
Python, we just make sure that the C program doesn't crash.

It's likely that we should be requiring some particular python version.
This is an alpha, though: I'm sure somebody will tell us which.

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Add a new test: test-fdleak which tests for fd leaks by creating many sockets.

This test opens a server socket, and forks a child which connects to that
server socket many times. It sets a low numbe

Add a new test: test-fdleak which tests for fd leaks by creating many sockets.

This test opens a server socket, and forks a child which connects to that
server socket many times. It sets a low number for the max open file limit
to catch any file descriptor leaks.
It would not work on Windows since it uses fork() to be able to create both the
server and the clients.

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Fix a test-call accidentally in the last commit

More abstraction in test.sh

Use %s with printf in test.sh

Add configure options to disable installation, regression tests

The main reason for disabling installation is if you're building
libevent as a subpackage for embedding: you want to have your main
pa

Add configure options to disable installation, regression tests

The main reason for disabling installation is if you're building
libevent as a subpackage for embedding: you want to have your main
package's "make all" build libevent, but you don't want your main
package's "make install" to install libevent.

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Fix test.sh output on solaris

Solaris echo -n doesn't omit newlines, but printf omits newlines in
more places.

Reorder backends in test.sh to match preference order in event.c

Make unit tests for epoll-with-changelist pass

The only changes needed were to handle the fact that the methodname
"epoll (with changelist)" matches the environment variable
EVENT_NOEPOLL rather tha

Make unit tests for epoll-with-changelist pass

The only changes needed were to handle the fact that the methodname
"epoll (with changelist)" matches the environment variable
EVENT_NOEPOLL rather than the imaginary "EVENT_EPOLL (WITH CHANGELIST)".

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Make test/test.sh call test-changelist

Eventually test-changelist should expand to try more cases, maybe
query the status of the actual changelist somehow, and integrate it
with the rest of the unit

Make test/test.sh call test-changelist

Eventually test-changelist should expand to try more cases, maybe
query the status of the actual changelist somehow, and integrate it
with the rest of the unit tests.

Also, add test-changelist to gitignore.

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Have the unit tests report errors from test.sh

The default behavior of test.sh was to suppress all output from
test/regress, and say nothing but OKAY or FAILED. This wasn't so good
for getting bugs

Have the unit tests report errors from test.sh

The default behavior of test.sh was to suppress all output from
test/regress, and say nothing but OKAY or FAILED. This wasn't so good
for getting bugs reported, since lots of people didn't know to set
TEST_OUTPUT_FILE, or re-run ./test/regress on its own.

Now, when you don't specify an output file for test.sh, it runs
regress with the --quiet option. This option makes the unit tests
only print output on failure, which is what we probably wanted.

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