cosmopolitan/libc/intrin/terminatethisprocess.c
Justine Tunney 0d74673213
Introduce interprocess signaling on Windows
This change gets rsync working without any warning or errors. On Windows
we now create a bunch of C:\var\sig\x\y.pid shared memory files, so sigs
can be delivered between processes. WinMain() creates this file when the
process starts. If the program links signaling system calls then we make
a thread at startup too, which allows asynchronous delivery each quantum
and cancelation points can spot these signals potentially faster on wait

See #1240
2024-09-19 03:02:13 -07:00

52 lines
2.7 KiB
C

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