tidy-up: OS names

Use these words and casing more consistently across text, comments and
one curl tool output:
AIX, ALPN, ANSI, BSD, Cygwin, Darwin, FreeBSD, GitHub, HP-UX, Linux,

tidy-up: OS names

Use these words and casing more consistently across text, comments and
one curl tool output:
AIX, ALPN, ANSI, BSD, Cygwin, Darwin, FreeBSD, GitHub, HP-UX, Linux,
macOS, MS-DOS, MSYS, MinGW, NTLM, POSIX, Solaris, UNIX, Unix, Unicode,
WINE, WebDAV, Win32, winbind, WinIDN, Windows, Windows CE, Winsock.

Mostly OS names and a few more.

Also a couple of other minor text fixups.

Closes #14360

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socketpair: provide `Curl_socketpair` only when `!CURL_DISABLE_SOCKETPAIR`

Ref: https://curl.se/dev/log.cgi?id=20240605035856-3529577

Reported-by: Marcel Raad
Closes #13888

socketpair: add `eventfd` and use `SOCK_NONBLOCK` for `socketpair()`

Currently, we use `pipe` for `wakeup_create`, which requires ***two***
file descriptors. Furthermore, given its compl

socketpair: add `eventfd` and use `SOCK_NONBLOCK` for `socketpair()`

Currently, we use `pipe` for `wakeup_create`, which requires ***two***
file descriptors. Furthermore, given its complexity inside, `pipe` is a
bit heavyweight for just a simple event wait/notify mechanism.

`eventfd` would be a more suitable solution for this kind of scenario,
kernel also advocates for developers to use `eventfd` instead of `pipe`
in some simple use cases:

Applications can use an eventfd file descriptor instead of a pipe
(see pipe(2) in all cases where a pipe is used simply to signal
events. The kernel overhead of an eventfd file descriptor is much
lower than that of a pipe, and only one file descriptor is required
(versus the two required for a pipe).

This change adds the new backend of `eventfd` for `wakeup_create` and
uses it where available, eliminating the overhead of `pipe`. Also, it
optimizes the `wakeup_create` to eliminate the system calls that make
file descriptors non-blocking by moving the logic of setting
non-blocking flags on file descriptors to `socketpair.c` and using
`SOCK_NONBLOCK` for `socketpair(2)`, `EFD_NONBLOCK` for `eventfd(2)`.

Ref:
https://man7.org/linux/man-pages/man7/pipe.7.html
https://man7.org/linux/man-pages/man2/eventfd.2.html
https://man7.org/linux/man-pages/man2/socketpair.2.html
https://www.gnu.org/software/gnulib/manual/html_node/eventfd.html

Closes #13874

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wakeup_create: use FD_CLOEXEC/SOCK_CLOEXEC

for `pipe()`/`socketpair()`

Fixes #13618
Closes #13625

socketpair: fix compilation when USE_UNIX_SOCKETS is not defined

Closes #13666

asyn-thread: use pipe instead of socketpair for IPC when available

If pipe() is present. Less overhead.

Helped-by: Viktor Szakats
Closes #12146

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- save

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- saves us from pointless churn
- git keeps history for us
- the year range is kept in COPYING

checksrc is updated to allow non-year using copyright statements

Closes #10205

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lib and tests: add missing curl.h includes

Closes https://github.com/curl/curl/pull/9453

copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the

copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the file
`.reuse/dep5`.

This commit also adds a Github workflow to check pull requests and adapts
copyright.pl to the changes.

Closes #8869

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copyright: update copyright year ranges to 2021

Reviewed-by: Emil Engler
Closes #6802

lib: drop USE_SOCKETPAIR in favor of CURL_DISABLE_SOCKETPAIR

.. since the former is undocumented and they both do the same thing.

Closes https://github.com/curl/curl/pull/6517

copyright: fix year ranges

Follow-up from 4d2f8006777

curl.se: new home

Closes #6172

socketpair: an implemention for Windows and more

Curl_socketpair() is designed to be used and work everywhere if there's
no native version or the native version isn't good enough.

socketpair: an implemention for Windows and more

Curl_socketpair() is designed to be used and work everywhere if there's
no native version or the native version isn't good enough.

Closes #4466

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