These were taken from a private repo which includes a reference implementation
meant for Tor, i.e. where the generation of NewHope's `a` value is produced in
constant-time via oversampling from the PRNG and running the values through a
Batcher merge-sorting network.

This copy of the code was taken from the master branch, commit 7ede68d4.

[init calls get calls init calls get calls init.... ]

It says, 'Incorrect expression (IDENTICAL_BRANCHES)'

Fix for CID 1364127. Not in any released Tor.

This is different from making the functions mockable, since
monotime_t is opaque and so providing mocks for the functions is
really hard.

This reverts commit 2999f0b3.

This code uses QueryPerformanceCounter() [**] on Windows,
mach_absolute_time() on OSX, clock_gettime() where available, and
gettimeofday() [*] elsewhere.

Timer types are stored in an opaque OS-specific format; the only
supported operation is to compute the difference between two timers.

[*] As you know, gettimeofday() isn't monotonic, so we include
a simple ratchet function to ensure that it only moves forward.

[**] As you may not know, QueryPerformanceCounter() isn't actually
always as monotonic as you might like it to be, so we ratchet that
one too.

We also include a "coarse monotonic timer" for cases where we don't
actually need high-resolution time.  This is GetTickCount{,64}() on
Windows, clock_gettime(CLOCK_MONOTONIC_COARSE) on Linux, and falls
back to regular monotonic time elsewhere.

Storing 255 into a char gives a warning when char is signed.

Fixes bug 19682; bugfix on 0.2.8.1-alpha, where these tests were added.

If we did not find a non-private IPaddress by iterating over interfaces,
we would try to get one via
get_interface_address6_via_udp_socket_hack().  This opens a datagram
socket with IPPROTO_UDP.  Previously all our datagram sockets (via
libevent) used IPPROTO_IP, so we did not have that in the sandboxing
whitelist.  Add (SOCK_DGRAM, IPPROTO_UDP) sockets to the sandboxing
whitelist.  Fixes bug 19660.

Fixes #18397 which prevented tor starting with Sandbox 1.

I'm not moving our "format and parse the time" functions, since
those have been pretty volatile over the last couple of years.

cypherpunks authored Jun 16, 2016 and Nick Mathewson committed Jul 08, 2016

The test-network-all target assumes the test-driver script lives in the
current working directory. This assumption breaks out-of-tree builds
because it actually lives in the source directory.

Automake 1.12 introduces `LOG_DRIVER` which defines the location of the
test driver script. Because Tor still supports Automake 1.11 we use the
default value of this variable directly. The default value uses the
configured shell for calling the test driver script and explicitly
prefixes the source directory.