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Spoof PID across execve() on Windows

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It's now possible with cosmo and redbean, to deliver a signal to a child
process after it has called execve(). However the executed program needs
to be compiled using cosmocc. The cosmo runtime WinMain() implementation
now intercepts a _COSMO_PID environment variable that's set by execve().
It ensures the child process will use the same C:\ProgramData\cosmo\sigs
file, which is where kill() will place the delivered signal. We are able
to do this on Windows even better than NetBSD, which has a bug with this

Fixes #1334
This commit is contained in:
Justine Tunney 2024-12-14 12:23:02 -08:00
parent 9cc1bd04b2
commit 26c051c297
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GPG key ID: BE714B4575D6E328
8 changed files with 187 additions and 21 deletions
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3
libc/proc/kill.c
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@ -35,6 +35,9 @@
* signal a cosmo process. The targeting process will then notice that a
* signal has been added and delivers to any thread as soon as possible.
*
* On Windows, the only signal that's guaranteed to work on non-cosmocc
* processes is SIGKILL.
*
* On Windows, the concept of a process group isn't fully implemented.
* Saying `kill(0, sig)` will deliver `sig` to all direct descendent
* processes. Saying `kill(-pid, sig)` will be the same as saying