ext/pcntl: Refactor `pcntl_exec()` (#17172)

* Refactor usage of strlcpy

As we allocate the buffer, we know the string will fit inside the buffer.

* Throw ValueErrors when s

ext/pcntl: Refactor `pcntl_exec()` (#17172)

* Refactor usage of strlcpy

As we allocate the buffer, we know the string will fit inside the buffer.

* Throw ValueErrors when strings contain null bytes

The underlying C calls work with C strings, which are NULL terminated.

* exec_pcntl() always return false

Thus, update stubs to formally have a return type of `false`.

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ext/pcntl adding Pcntl namespace for Qos class.

Close GH-14892

ext/pcntl: Added new function pcntl_waitid

to obtain status information pertaining termination, stop, and/or
continue events in one the caller's child processes.

close GH-14617

ext/pcntl: signals list update for dragonflybsd related to checkpoint.

- SIGCKPT checkpoint and continue.
- SIGCKPTEXIT checkpoint and exit.

Close GH-14011

ext/pcntl: pcntl_getqos_class/pcntl_setqos_class addition.

Introducting macOs Quality Of Service through those two calls.
on macOs arm64/M*, there is no concept of individual cores, thus

ext/pcntl: pcntl_getqos_class/pcntl_setqos_class addition.

Introducting macOs Quality Of Service through those two calls.
on macOs arm64/M*, there is no concept of individual cores, thus
the old thread policy for cpu affinity does not work here.
Instead, the user can apply to the current process the level of
performance/energy consumption they wish from the highest
QosClass::UserInteractive to QosClass::Background.

Close GH-13945

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ext/pcntl: adding pcntl_getcpu.

using sched_getcpu under the hood (Linux and FreeBSD).
Returns the current cpu id for the current process.
For Linux, we need to see beyond the sole p

ext/pcntl: adding pcntl_getcpu.

using sched_getcpu under the hood (Linux and FreeBSD).
Returns the current cpu id for the current process.
For Linux, we need to see beyond the sole presence of the symbol
to consider it.
Mostly useful, for now, in the cpu affinity context since
the os can migrate processes as it sees fits otherwise.

Clos GH-13908

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ext/pcntl: cpu affinity api introduction.

For now, working on Linux, FreeBSD >= 13.x and DragonFlyBSD.
Handy wrapper to assign an array of cpu ids or to retrieve the cpu ids
assigned

ext/pcntl: cpu affinity api introduction.

For now, working on Linux, FreeBSD >= 13.x and DragonFlyBSD.
Handy wrapper to assign an array of cpu ids or to retrieve the cpu ids
assigned to a given process.

pcntl_setaffinity inserts valid unique cpu ids (within the range of available
cpus).

Close GH-13893

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ext/pcntl: pcnt_setns few nitpicks changes. (#13885)

ext/pcntl: adding pcntl_setns for Linux >= 5.3

allows a given process to join an existing Linux namespace, relatively
complementary to the existing pcntl_unshare.

Close GH-13878

Fix GH-9923: Add the `SIGINFO` constant in pcntl for system supporting it.

Closes #9938

Declare ext/pcntl constants in stubs (#9075)

Fix pcntl_forkx condition in stub (#7755)

pcntl add forkx for solaris based systems. (#7654)

fix stub for pcntl_rfork

pcntl: Adding pcntl_rfork support.

Generate class entries from stubs for oci8, odbc, openssl, pcntl, pdo, pgsql

Closes GH-6691

Update ext/pcntl parameter names

Closes GH-6278.

Promote warnings to exceptions in ext/pcntl

Closes GH-6004

Add another round of missing parameter types to stubs

Closes GH-5950

Add a few missing types to stubs

Fix some UNKNOWN default values

In ext/ffi, ext/intl, ext/mysqli, and ext/pcntl

Fix [-Wundef] warning in PCNTL extension

Generate function entries from stubs

Converts ext/pcntl, ext/simplexml, ext/snmp, ext/soap, ext/sqlite3.
Closes GH-5421

Annotate function aliases in stubs

Add stubs for aliases

Closes GH-5187