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26c051c297
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
53 lines
2.8 KiB
C
53 lines
2.8 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/atomic.h"
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#include "libc/calls/sig.internal.h"
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#include "libc/limits.h"
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#include "libc/nt/files.h"
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#include "libc/nt/memory.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/thunk/msabi.h"
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#include "libc/runtime/internal.h"
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#ifdef __x86_64__
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__msabi extern typeof(DeleteFile) *const __imp_DeleteFileW;
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__msabi extern typeof(TerminateProcess) *const __imp_TerminateProcess;
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__msabi extern typeof(UnmapViewOfFile) *const __imp_UnmapViewOfFile;
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/**
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* Terminates the calling process and all of its threads.
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*/
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textwindows dontinstrument void TerminateThisProcess(uint32_t dwWaitStatus) {
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// delete sig file
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char16_t path[128];
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atomic_ulong *real;
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atomic_ulong fake = 0;
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real = __sig.process;
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__sig.process = &fake;
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__imp_UnmapViewOfFile(real);
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__imp_DeleteFileW(__sig_process_path(path, __pid, false));
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// "When a process terminates itself, TerminateProcess stops execution
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// of the calling thread and does not return." -Quoth MSDN
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__imp_TerminateProcess(-1, dwWaitStatus);
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__builtin_unreachable();
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}
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#endif /* __x86_64__ */
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