libcasper: document that most libcasper functions are not thread-safe

And neither are most libcasper services' functions, because internally
they all use cap_xfer_nvlist. cap_xfer_nvlist sends and

libcasper: document that most libcasper functions are not thread-safe

And neither are most libcasper services' functions, because internally
they all use cap_xfer_nvlist. cap_xfer_nvlist sends and then receives
data over a unix domain socket and associated with the cap_channel_t
argument. So absent synchronization, two threads may not use the same
cap_channel_t argument or they risk receiving the other's reply.

MFC after: 2 weeks
Sponsored by: Axcient
Reviewed by: oshogbo
Differential Revision: https://reviews.freebsd.org/D42928

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Remove $FreeBSD$: two-line nroff pattern

Remove /^\.\\"\n\.\\"\s*\$FreeBSD\$$\n/

[skip ci] improvements to cap_sysctl.3

* Correct some function prototypes which were documented with the wrong
pointer type.
* Clarify return values and requirements for freeing the limit handle.

[skip ci] improvements to cap_sysctl.3

* Correct some function prototypes which were documented with the wrong
pointer type.
* Clarify return values and requirements for freeing the limit handle.

MFC after: 1 week
Sponsored by: Axcient
Reviewed by: oshogbo
Differential Revision: https://reviews.freebsd.org/D37586

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cap_sysctl.3: Fix bugs in the example

- Correct the type of the sysctl value.
- Initialize the oldsize parameter to cap_sysctlbyname()

MFC after: 1 week
Sponsored by: The FreeBSD Foundation

libcasper(3): Document HISTORY within the manpages

Reviewed by: bcr (mentor)
Approved by: bcr (mentor)
MFC after: 7 days
Differential Revision: https://reviews.freebsd.org/D24695

libcasper: Constify cap_sysctl_limit_mib() mib parameter

No functional change. Minor API change that is nicer for consumers. ABI is
identical; the routine never needed to modify the pointed to value

libcasper: Constify cap_sysctl_limit_mib() mib parameter

No functional change. Minor API change that is nicer for consumers. ABI is
identical; the routine never needed to modify the pointed to value.

Reviewed by: emaste, markj
Differential Revision: https://reviews.freebsd.org/D24319

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MFHead @348740

Sponsored by: The FreeBSD Foundation

Add cap_sysctl(3) and cap_sysctlnametomib(3).

These complement cap_sysctlbyname(3) to provide a drop-in
replacement for the corresponding libc functions.

Also revise the libcap_sysctl limit interfa

Add cap_sysctl(3) and cap_sysctlnametomib(3).

These complement cap_sysctlbyname(3) to provide a drop-in
replacement for the corresponding libc functions.

Also revise the libcap_sysctl limit interface to provide access
to sysctls by MIB, and to avoid direct manipulation of nvlists
by the caller.

Reviewed by: oshogbo
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D17854

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Fix similar typos to r331124.

Document the sysctl Casper service.

PR: 226102
Reviewed by: bcr@
Differential Revision: https://reviews.freebsd.org/D14606