t_time_arith: New test for timer calculations.

This will facilitate fixing various problems in the arithmetic to
determine, given an itimer's scheduled time (it_value) and periodic
interval (it_inte

t_time_arith: New test for timer calculations.

This will facilitate fixing various problems in the arithmetic to
determine, given an itimer's scheduled time (it_value) and periodic
interval (it_interval) along with the current time of actual expiry
(now), what time the itimer should be rescheduled for (next, new
value of it_timer) on the same clock.

Later we can also put tests for other functions like tvtohz here, and
make them test many different values of hz/tick.

XXX Not 100% sure about all of these cases -- there is some room for
reasonable discussion about what the right answer is. But we have
unquestionably implemented the wrong thing for many of these cases,
even if the answers this test checks for may not be quite right yet.

PR kern/58922: itimer(9): arithmetic overflow
PR kern/58925: itimer(9) responds erratically to clock wound back
PR kern/58926: itimer(9) integer overflow in overrun counting
PR kern/58927: itimer(9): overrun accounting is broken

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tests/kernel/t_cloexec: New tests for close-on-exec.

Verified that the following tests fail on a netbsd-10 kernel:

- clonedev_posixspawn
- dup3_posixspawn
- fcntldupfd_posixspawn

PR kern/58822: cl

tests/kernel/t_cloexec: New tests for close-on-exec.

Verified that the following tests fail on a netbsd-10 kernel:

- clonedev_posixspawn
- dup3_posixspawn
- fcntldupfd_posixspawn

PR kern/58822: close-on-exec is broken for dup3 and opening cloning
devices

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Add a test for clock_nanotime() [ PR kern/58733 ]

Add a t_nanosleep test to the kernel tests, to (to a limited extent)
validate its functionality.

Initially this concentrates on the issue from PR k

Add a test for clock_nanotime() [ PR kern/58733 ]

Add a t_nanosleep test to the kernel tests, to (to a limited extent)
validate its functionality.

Initially this concentrates on the issue from PR kern/58733
where if a process paused in nanosleep() is stopped, and then
continued, and if it is using TIMER_ABSTIME, the call will
return prematurely, but indicating success.

There are (currently) 4 test cases, to test all 4 possibilities
using CLOCK_MONOTONIC and CLOCK_REALTIME (if someone wants to
add any other clocks that make sense, that should be easy) and
TIMER_ABSTIME and TIMER_RELTIME.

Currently both TIMER_ABSTIME tests fail (the TIMER_RELTIME
tests pass). When the kernel bug is fixed, the ABSTIME
tests should be fixed along with it.

These tests are currently somewhat crude, and I'm not sure
how well they will work on a qemu test system (they work as
expected on bare metal).

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tests: Fix build error. Set TESTS_SH correctly.

new semtimedop(2) test GSoC 2024 (Shivraj Jamgade)

add tests/kernel/t_umount.c: test case for unmount(2)

demonstrate that failing to umount and async mounted file system causes the
kernel syncer to start flushing dirty buffers for it.

PR kern/58564

add tests/kernel/t_umount.c: test case for unmount(2)

demonstrate that failing to umount and async mounted file system causes the
kernel syncer to start flushing dirty buffers for it.

PR kern/58564: async mounts revert to being synced after failed unmount

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Add a test for kern/58149

aarch64: Cannot return from a signal handler if SP was misaligned when the signal arrived

The t_fdrestart test requires rump.

t_fdrestart: New test of closing fd with another thread in I/O on it.

Adapted from regress/sys/kern/dislodgefd.

PR kern/57659

Revert addition of epoll to libc until discussion concludes

Add tests for t_memfd_create and fix bug found by tests

Add epoll(2) from Theodore Preduta as part of GSoC 2023

adapt to ${CC_WNO_FORMAT_TRUNCATION}

Add new test t_open_pr_57260

New test case that reflects the fix in PR kern/57260. The majority of
work for this case itself was by riastradh@, who'd supplied the basis
for it in the ticket, and pro

Add new test t_open_pr_57260

New test case that reflects the fix in PR kern/57260. The majority of
work for this case itself was by riastradh@, who'd supplied the basis
for it in the ticket, and provided further guidance.

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t_simplehook requires RUMP

Added tests for the linear hook APIs

Add basic checks for magic symlink(7)'s. These include a case for PR lib/55361,
although it seems that realpath(3) has bigger problems with these symlinks.

Add a test case for PR kern/52744, which no longer appears to be present.

Centralize the base rump libraries into a variable used by all the other
Makefiles so that we can make changes to it centrally as needed and have
less mess. Fixes the sun2 build that needs rumpvfs af

Centralize the base rump libraries into a variable used by all the other
Makefiles so that we can make changes to it centrally as needed and have
less mess. Fixes the sun2 build that needs rumpvfs after librump after
the latest changes.

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Test that fpu state is preserved by fork.

convert HAVE_GCC == 7 to HAVE_GCC >= 7.

Add tests for fexecve(2)

Add F_GETPATH, presented to tech-kern.

Adapt tests/kernel/t_subr_prf for MKSANITIZER

Allow to rename snprintf-like functions to avoid clashes with a sanitizer.

This tests needs a fixup to remove 'undef symbol' from the test code
generat

Adapt tests/kernel/t_subr_prf for MKSANITIZER

Allow to rename snprintf-like functions to avoid clashes with a sanitizer.

This tests needs a fixup to remove 'undef symbol' from the test code
generator.

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Add a $ORIGIN test