nanosleep.2: List clock_nanosleep() in the NAME section.

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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Use ${} instead of $() in various makefiles

Also use ${.TARGET} and ${.ALLSRC] wherever impossible.

Minor style adjustment in at(1)'s makefiles.

Fix various mistakes (s/it were/it was/) in manual pages.

libc/citrus: Cleanup the DFprivate_1.0 section of the Symbol.map.

None of these symbols were ever in our libc.

libc/citrus: Remove two unused header files.

libc/citrus: Fix some typos in DFprivate_1.0 in the Symbol.map.

setbuf.3: Mention stdbuf(1) and update HISTORY & BUGS sections

Obtained-from: FreeBSD
Reported-by: swildner

libc/gen/devname.c: No need to include <paths.h>

devname.3: Add a little example

Obtained from FreeBSD but with some updates.

devname(3): Remove obsolete code that queries dev.db

In the old days of static /dev, devname(3) would get the name by
querying the /var/run/dev.db created by dev_mkdb(8). Now that we have
dynamic /

devname(3): Remove obsolete code that queries dev.db

In the old days of static /dev, devname(3) would get the name by
querying the /var/run/dev.db created by dev_mkdb(8). Now that we have
dynamic /dev provided by devfs(5), the device name is provided by the
'kern.devname' sysctl, thus obsoleting the db query code.

I've tested to verify that the db query code isn't being used now. So
it's safe to remove this obsolete code. Cleanups to dev_mkdb(8) and
related code would follow.

Meanwhile, update the man page to reflect the current code.

Discussed-with: swildner

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libc/gen/gen_private.h: Include <sys/types.h> for off_t.

Do not rely on the including file to bring it in.

libc/fmtcheck: Sync with FreeBSD (only comments).

devname.3: Update man page to align wht the code

build - Fix building new sources on older systems

* Fix compile errors when doing a new buildwolrd on an old
base system.

pthreads: Add pthread_yield_np().

Same as non standard pthread_yield() but with correct '_np' suffix.

world: Add <sys/single_threaded.h>

The __libc_single_threaded is publicly exported version of libc private
__isthreaded symbol that does not reset on fork in threaded programs.

pthreads: Add pthread_is_threaded_np() function.

pthreads: Enhance pthread_sigprocmask() stub.

Some ports expect this function to work even before pthread_create().

pthreads: Add pthread_getattr_np().

Adapted-from: NetBSD

pthreads: Reimplement pthread types using non polluting types.

Use __ implementation specific namespace and adjust libthread_xu.
* The pthread_addr_t type was specific only to libc_r, remove it.

pthreads: Reimplement pthread types using non polluting types.

Use __ implementation specific namespace and adjust libthread_xu.
* The pthread_addr_t type was specific only to libc_r, remove it.
* The pthread_startroutine_t typedef was never used since initial fork.
* The mutex member in struct pthread_once was for libc_r only, rename
it to __sparelibc_r void pointer to keep ABI compatibility.
* Mangle struct names using __type_s scheme to avoid collisions with
user defined types in 3rd-party software packages.
* Adjust partly publicly visible struct pthread_once members too.

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libc: Reduce <pthread.h> exposure.

inet6_opt_init.3: Use standard integer types in the SYNOPSIS.

libc/stdio: Add missing MLINK.

libc/stdio: Add _unlocked() flavors of fflush, fputc, fputs, fread, fwrite.

These are needed by some dports and can also be used in various things
in base. Bump __DragonFly_version, too.

Reported-b

libc/stdio: Add _unlocked() flavors of fflush, fputc, fputs, fread, fwrite.

These are needed by some dports and can also be used in various things
in base. Bump __DragonFly_version, too.

Reported-by: zrj
Taken-from: FreeBSD

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