lib: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl s

lib: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by: Netflix

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libc: Purge unneeded cdefs.h

These sys/cdefs.h are not needed. Purge them. They are mostly left-over
from the $FreeBSD$ removal. A few in libc are still required for macros
that cdefs.h defines. Kee

libc: Purge unneeded cdefs.h

These sys/cdefs.h are not needed. Purge them. They are mostly left-over
from the $FreeBSD$ removal. A few in libc are still required for macros
that cdefs.h defines. Keep those.

Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D42385

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Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

Merge ^/head r325999 through r326131.

General further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier f

General further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

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MFH r289384-r293170

Sponsored by: The FreeBSD Foundation

Catch up with head (r291075).

1) Remove my overcomplicated error fallback and just return error
immediatelly as old code does, now for append modes too.
Real use case for such fallback is impossible (unless specially crafted).

2

1) Remove my overcomplicated error fallback and just return error
immediatelly as old code does, now for append modes too.
Real use case for such fallback is impossible (unless specially crafted).

2) Remove now unneded include I forgot to remove in prev. commits.

MFC after: 1 week

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Reorganize code to elimitate one _sseek() call for append modes.

MFC after: 1 week

Merge from head

Microoptimize.

Addition to prev. commit.
In some edge cases fp->_p can be changed in _sseek(), recalculate.

PR: 204156
MFC after: 1 week

Don't seek to the end if write buffer is empty (in append modes).

PR: 204156
MFC after: 1 week

Add _flags2 per jhb@ suggestion since no room left in _flags.
Rewrite O_APPEND flag checking using new __S2OAP flag.

MFC after: 3 weeks

Merge from head

Sponsored by: Gandi.net

Since no room left in the _flags, reuse __SALC for O_APPEND.
It helps to remove _fcntl() call from _ftello() and optimize seek position
calculation in _swrite().

MFC after: 3 weeks

IFC @r269962

Submitted by: Anish Gupta (akgupt3@gmail.com)

Merge head from 7/28

Sync to HEAD@r269943.

For "a"-mode files and rewind/fseek + fwrite combination return meaningful
value now, like Apple does, but avoid their __sflush physical write
performance degradation as much as possible.

Back the whole change out until I figure out how to obtain O_APPEND,
it can't be used in this field at all.

Checking for __SAPP alone is not enough because it is emulated O_APPEND
only, so works for only special fdopen() case. Add real O_APPEND too.

Revert r268984:
Check for __SAPP flag before calling sflush. This avoids
performance degradation compared to the previous approach.

Submitted by: ache
MFC after: 2 weeks

ftello: return 1 when seeking offset on an append stream.

Obtained from: Apple Inc. (Libc 997.90.3)
Phabric: D442
MFC after: 2 weeks

Merge from head