arc4random(3): Add automatic tests.

This verifies that:
- arc4random zeroes its state and reseeds itself on fork
- arc4random reseeds itself on entropy consolidation (e.g., VM clone)
- arc4random fa

arc4random(3): Add automatic tests.

This verifies that:
- arc4random zeroes its state and reseeds itself on fork
- arc4random reseeds itself on entropy consolidation (e.g., VM clone)
- arc4random falls back to global state if it can't allocate local
state because address space limits cause mmap to fail

NOTE: This adds a new libc symbol __arc4random_global, but it's in
the reserved namespace and only used by t_arc4random, so no libc
minor bump.

PR kern/58632: getentropy(2) and arc4random(3) do not reseed on VM
fork

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libc: Reintroduce getentropy.

This was introduced two years ago when the getrandom/getentropy API
question was still open, and removed because the discussion was
ongoing. Now getentropy is more wid

libc: Reintroduce getentropy.

This was introduced two years ago when the getrandom/getentropy API
question was still open, and removed because the discussion was
ongoing. Now getentropy is more widely adopted and soon to be in
POSIX. So reintroduce the symbol into libc since we'll be keeping it
anyway. Discussion of details of the semantics, as interpreted by
NetBSD, is ongoing, but the symbol needs to get in before the
netbsd-10 branch. The draft POSIX text is
(https://www.opengroup.org/austin/docs/austin_1110.pdf):

SYNOPSIS
#include <unistd.h>

int getentropy(void *buffer, size_t length);

DESCRIPTION
The getentropy() function shall write length bytes of data
starting at the location pointed to by buffer. The output
shall be unpredictable high quality random data, generated by
a cryptographically secure pseudo-random number
generator. The maximum permitted value for the length
argument is given by the {GETENTROPY_MAX} symbolic constant
defined in <limits.h>.

RETURN VALUES
Upon successful completion, getentropy() shall return 0;
otherwise, -1 shall be retunred and errno set to indicate the
error.

ERRORS
The getentropy() function shall fail if:

[EINVAL] The value of length is greater than
{GETENTROPY_MAX}.

The getentropy() function may fail if:

[ENOSYS] The system does not provide the necessary
source of entropy.

RATIONALE
The getentropy() function is not a cancellation point.

Minor changes from the previous introduction of getentropy into libc:

- Return EINVAL, not EIO, on buflen > 256.
- Define GETENTROPY_MAX in limits.h.

The declaration of getentropy in unistd.h and definition of
GETENTROPY_MAX in limits.h are currently conditional on
_NETBSD_SOURCE. When the next revision of POSIX is finalized, we can
expose them also under _POSIX_C_SOURCE > 20yymmL as usual -- and this
can be done as a pullup without breaking existing compiled programs.

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Update t_siginfo.c build rules

Add logic for MKSANITIZER/MKLIBCSANITIZER checks.

-frounding-math is gcc specific, help clang builds

PR/54000: Andreag Gustafsson: Compile the rounding test with
-fround-math since with gcc-7, the default mode ignores fenv settings
(the same effect can be achieved with -O0 :-)

https://gcc.gnu.org/w

PR/54000: Andreag Gustafsson: Compile the rounding test with
-fround-math since with gcc-7, the default mode ignores fenv settings
(the same effect can be achieved with -O0 :-)

https://gcc.gnu.org/wiki/FloatingPointMath

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remove exect, it will not be fixed and it will be removed.

Attach t_exect to ATF tests and distribution

Add missing SIGTRAP handler. Assert there that the signal is SIGTRAP as
expected and si_code TRAP_TRACE.

This test will break on some ports that have du

Attach t_exect to ATF tests and distribution

Add missing SIGTRAP handler. Assert there that the signal is SIGTRAP as
expected and si_code TRAP_TRACE.

This test will break on some ports that have dummy or incomplete
implementation of exect(2).

This test works on amd64 correctly.

Sponsored by <The NetBSD Foundation>

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Add __TEST_FENV

Put have fenv elsewhere.

Sync list of fenv enabled architectures again (PR 48633), this time for mips
addition.

While PR 48633 is not properly fixed, keep the additional lists of
fenv-enabled architectures in sync.

Build t_fpgetmask/t_fpgetround for aarch64 since they are now in libc

Enable fenv for arm

Do not set HAVE_FENV for arm as long as it misses feenableexcept().

Use the same condition for HAVE_FENV

Changes to existing files to enable building AARCH64 userland.
evbarm64-el
This is clang only. While gcc4.8 supports aarch64, no netbsd support has
been written for aarch64 with gcc4.8.

Minimal execve(2) ATF test.

Add test for uint64 to real long double conversion.

Convert old src/regress/timer&waiter tests to ATF

Do not re-add -mieee option on alpha, it's already set by default.

Add a case for PR lib/41558. It is unclear whether this is a bug, but at
least it is documented now. Probably it would be better to follow Linux,
where the test case does not fail.

Add few basic tests for realpath(3).

Move posix_spawn tests to lib/libc/gen/posix_spawn - they test both libc
and kernel, but that is an implementation detail unrelated to the tests
themselfs.
Ok: releng

Few naive checks for cpuset(3) and ftok(3).

Few naive checks for time(3).