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libc_private.h: use private namespace name for size_t

This is direct commit to stable/13.

(cherry picked from commit a951992d1eb332ed1e97ef6b89ead3f05707adc2)

libc_private.h: use private namespace name for size_t

This is direct commit to stable/14.

libc printf_render_errno(): do not use strerror()

(cherry picked from commit aa66995b4c804cbb579f71645d97fe282a798bfc)

__vprintf(): switch from strerror() to strerror_rl()

PR:     278556

(cherry picked from commit f887667694632c829b0599b54ff86a072e93df87)

libc: minor style, wrap long lines

(cherry picked from commit bac9d7e8f2931149815c3d5a9ab69594bbdffde6)

libc: make strerror_rl() usable for libc

(cherry picked from commit 92771bc00ad0f567b27876c34450bef7a0ee61d0)

libc: minor style, wrap long lines

(cherry picked from commit bac9d7e8f2931149815c3d5a9ab69594bbdffde6)

__vprintf(): switch from strerror() to strerror_rl()

PR:     278556

(cherry picked from commit f887667694632c829b0599b54ff86a072e93df87)

libc printf_render_errno(): do not use strerror()

(cherry picked from commit aa66995b4c804cbb579f71645d97fe282a798bfc)

libc: make strerror_rl() usable for libc

(cherry picked from commit 92771bc00ad0f567b27876c34450bef7a0ee61d0)

pthread_sigqueue(3): document

(cherry picked from commit 91da6becae6291533b9b59646b59bace2f905c81)

sigqueue(2): Document __SIGQUEUE_TID

(cherry picked from commit dcc180c51b9c13df3d1158d14d450308711fe93c)

sigqueue(2): add impl-specific flag __SIGQUEUE_TID

(cherry picked from commit 53186bc1435e2c3ccf9c2124c066a08c6a80c504)

sys/signal.h: move union sigval into dedicated private header sys/_sigval.h

(cherry picked from commit 97acb35bd704ac1ef0bd2e286eb8bd09ce4b3ef0)

kern_thread.c: remove unneeded include of sys/param.h

(cherry picked from commit 53e0938b0b5619fa851e8550c2396bd8c440b7ae)

Add test for pthread_sigqueue(3)

(cherry picked from commit fb2ab7ce52d3f1e9d0998f3e5c12c3468ce4563a)

libthr: add pthread_sigqueue(3)

PR:     278459

(cherry picked from commit 220aa0f450409948b869237e5c4505f992c913ce)

kern_thr.c: normalize includes

(cherry picked from commit 0c11c1792b139baffbf74e5f1c6fe065708301cc)

kern_thr.c/kern_sig.c: remove sys/cdefs.h

(cherry picked from commit 2effad53b4676dcfe4da892cd72a9a235a9539d1)

rtld.1: clarify interaction between -u and -o

Sponsored by:   The FreeBSD Foundation
MFC after:      1 week

rtld direct exec: make -u behavior match the description

Instead of only ignoring insecure env vars, clear them all.

Reviewed by:    emaste, markj
Sponsored by:   The FreeBSD Foundation
MFC after:      1 week
Differential revision:  https://reviews.freebsd.org/D44999

rtld: add direct-exec option -o

allowing to set any known LD_ parameter for the current rtld invocation,
but without polluting the activated' binary environment.  In other
words, the set parameter is not exported into the environment.

Reviewed by:    markj
Sponsored by:   The FreeBSD Foundation
MFC after:      1 week
Differential revision:  https://reviews.freebsd.org/D44988

cxgbe(4): Shared code update to deal with partial failure in query_params.

Obtained from:  Chelsio Communications
MFC after:      1 week
Sponsored by:   Chelsio Communications

cxgbe(4): Reword the comment explaining the atid/cookie split.

Avoid a magic constant while here.  No functional change intended.

MFC after:      1 week
Sponsored by:   Chelsio Communications

cxgbe(4): Add missing description for a port type.

MFC after:      1 week
Sponsored by:   Chelsio Communications

cxgbe(4): Retire t4_intr_clear.

The firmware clears the interrupts already and it has a better idea of
exactly what to clear for which generation of the ASIC.  There is no
need for the driver to get involved.

MFC after:      1 week
Sponsored by:   Chelsio Communications

cxgbe(4): Add a helper function to locate MPS/MAC registers.

These register blocks are at different locations in different chips.

MFC after:      1 week
Sponsored by:   Chelsio Communications

cxgbe(4): Remove tx_modq lookup table.

The driver always uses the same modulation queue as the channel and the
table is unnecessary.

MFC after:      1 week
Sponsored by:   Chelsio Communications

pflow: handle unattached states

It's possible for states to be cleaned up (through pf_detach_state()) that
have not been fully attached. For example if there's an ID conflict during
pf_state_insert().

pflow exports states from pf_detach_state(), so it can get called on such
states, but did not account for this and could end up dereferencing a NULL
state key.

Check for this in export_pflow() and do not export unattached states.

See also:       https://redmine.pfsense.org/issues/15446
Sponsored by:   Rubicon Communications, LLC ("Netgate")

ctl: Fix CTL GET EVENT STATUS NOTIFICATION valid bits

Linux as an initiator periodically sends the following to SCSI cdrom
devices: 4a 01 00 00 10 00 00 00 08 00

According to the ctl_cmd_entry for this command this is invalid which
leads to a lot of failed SCSI commands.

The mask in this commit is based off of an early draft of the mmc
standard, https://www.t10.org/ftp/t10/document.97/97-108r0.pdf,
as well as subsequent standards (mmc2 through mmc6).

This solves the issue with Linux initiators.

Signed-off-by: HP van Braam <hp at tmm.cx>
Reviewed by: imp, mav
Pull Request: https://github.com/freebsd/freebsd-src/pull/1201