pthread_{attr_,}setaffinity_np.3: Fix section number in .Dt

Some additions and fixes related to fdatasync(2) and posix_fallocate(2).

* Fix a small issue in VOP_FDATASYNC()'s definition in <sys/vfsops.h>.

* Mention fdatasync() in fsync.2 (this basically sync

Some additions and fixes related to fdatasync(2) and posix_fallocate(2).

* Fix a small issue in VOP_FDATASYNC()'s definition in <sys/vfsops.h>.

* Mention fdatasync() in fsync.2 (this basically syncs that manual page
with FreeBSD, with a few adjustments).

* Add a manual page for posix_fallocate() (from FreeBSD, with a few
adjustments).

* Mention fdatasync() in the list of reentrant functions in sigaction.2.

* In pthread_testcancel.3, mention fdatasync() in the list of functions
for which a cancellation point will occur.

* Mention VOP_FDATASYNC() in VOP_FSYNC.9 (partly taken from FreeBSD).

* Remove a compatibility define in the fsstress tool.

Thanks to tkusumi for reviewing.

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libpthread: Implement pthread_getname_np() and pthread_setname_np().

Varieties of pthread_get_name_np() and pthread_set_name_np() that return
an integer (0 or error number).

These are only used for

libpthread: Implement pthread_getname_np() and pthread_setname_np().

Varieties of pthread_get_name_np() and pthread_set_name_np() that return
an integer (0 or error number).

These are only used for debugging but it looks like some ports want them.

I took some of the documentation from FreeBSD.

Reported-by: zrj

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libpthread: Separate the MLINKS better.

Implement clock_nanosleep(2) system call

* Extend the nanosleep1() function in kern_time.c to support the
clock_nanosleep(2) system call. Add {kern,sys}_clock_nanosleep()
functions and update k

Implement clock_nanosleep(2) system call

* Extend the nanosleep1() function in kern_time.c to support the
clock_nanosleep(2) system call. Add {kern,sys}_clock_nanosleep()
functions and update kern_nanosleep() accordingly.

* Add clock_nanosleep() syscall to syscalls.master and regenerate
syscall-related files.

* Update libc symbols with the new syscall.

* Add clock_nanosleep() warpper in libthread_xu.

* Update nanosleep.2 man page to describe clock_nanosleep().

* Update <time.h> and bump __DragonFly_version.

This work is loosely based on the FreeBSD implementation:
https://reviews.freebsd.org/rS315526

This clock_nanosleep(2) syscall passed all tests in the Open POSIX Test
Suite [0]:

conformance/interfaces/clock_nanosleep/1-1: execution: PASS
conformance/interfaces/clock_nanosleep/1-2: execution: PASS
conformance/interfaces/clock_nanosleep/1-3: execution: PASS
conformance/interfaces/clock_nanosleep/1-4: execution: PASS
conformance/interfaces/clock_nanosleep/1-5: execution: PASS
conformance/interfaces/clock_nanosleep/2-1: execution: PASS
conformance/interfaces/clock_nanosleep/2-2: execution: PASS
conformance/interfaces/clock_nanosleep/2-3: execution: PASS
conformance/interfaces/clock_nanosleep/3-1: execution: PASS
conformance/interfaces/clock_nanosleep/4-1: execution: PASS
conformance/interfaces/clock_nanosleep/5-1: execution: PASS
conformance/interfaces/clock_nanosleep/6-1: execution: PASS
conformance/interfaces/clock_nanosleep/9-1: execution: PASS
conformance/interfaces/clock_nanosleep/8-1: execution: PASS
conformance/interfaces/clock_nanosleep/10-1: execution: PASS
conformance/interfaces/clock_nanosleep/11-1: execution: PASS
conformance/interfaces/clock_nanosleep/13-1: execution: PASS
conformance/interfaces/clock_nanosleep/15-1: execution: PASS

[0] Open POSIX Test Suite: http://posixtest.sourceforge.net/

Reviewed-by: swildner, dillon, tuxillo, zach

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