Commits on Feb 21, 2023

1. std.child_process: enable non-standard streams …

   This PR simplifies the setup code and handling of non-standard file
   descriptors and handles for Windows and Posix with main focus on pipes.
   
   Portable pipes default to pipe2 with CLOEXEC on Posix and disabled handle
   inhertance on Windows except shortly before and after the creation of
   the "child process".
   
   Leaking of file desriptors on Posix
   1. CLOEXEC does not take immediately effect with clone(), but after the
   setup code for the child process was run and a exec* function is executed.
   External code may at worst be long living and never do exec*.
   2. File descriptors without CLOEXEC are designed to "leak to the child",
   but every spawned process at the same time gets them as well.
   
   Leaking of handles on Windows
   1. File leaking on Windows can be fixed with an explicit list approach
   as suggested in ziglang#14251, which might require runtime probing and
   allocation of the necessary process setup list. Otherwise, it might
   break on Kernel updates.
   2. The potential time for leaking can be long due trying to spawn on
   multiple PATH and PATHEXT entries on Windows.

   

   matu3ba committed Feb 21, 2023
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