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https://github.com/jart/cosmopolitan.git
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99dc1281f5
The new asynchronous signal delivery technique is now also being used for tkill(), raise(), etc. Many subtle issues have been addresesd. We now signal handling on Windows that's remarkably similar to the POSIX behaviors. However that's just across threads. We're lacking a way to have the signal semantics work well, across multiple WIN32 processes.
115 lines
5.1 KiB
C
115 lines
5.1 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2023 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/calls/sig.internal.h"
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#include "libc/calls/struct/ucontext.internal.h"
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#include "libc/calls/ucontext.h"
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#include "libc/dce.h"
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#include "libc/fmt/itoa.h"
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#include "libc/intrin/atomic.h"
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#include "libc/macros.internal.h"
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#include "libc/nt/enum/context.h"
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#include "libc/nt/enum/ctrlevent.h"
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#include "libc/nt/enum/threadaccess.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/struct/context.h"
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#include "libc/nt/thread.h"
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#include "libc/nt/thunk/msabi.h"
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#include "libc/sysv/consts/sicode.h"
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#include "libc/thread/posixthread.internal.h"
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#include "libc/thread/tls2.internal.h"
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#ifdef __x86_64__
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// WIN32 doesn't have the System V red-zone. Microsoft says they reserve
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// the right to trample all over it. so we technically don't need to use
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// this value. it's just not clear how common it is for WIN32 to clobber
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// the red zone, which means broken code could seem to mostly work which
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// means it's better that we're not the ones responsible for breaking it
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#define kRedzoneSize 128
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// Both Microsoft and the Fifth Bell System agree on this one.
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#define kStackAlign 16
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__msabi extern typeof(CloseHandle) *const __imp_CloseHandle;
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__msabi extern typeof(GetLastError) *const __imp_GetLastError;
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__msabi extern typeof(GetStdHandle) *const __imp_GetStdHandle;
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__msabi extern typeof(GetThreadContext) *const __imp_GetThreadContext;
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__msabi extern typeof(OpenThread) *const __imp_OpenThread;
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__msabi extern typeof(ResumeThread) *const __imp_ResumeThread;
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__msabi extern typeof(SetThreadContext) *const __imp_SetThreadContext;
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__msabi extern typeof(SuspendThread) *const __imp_SuspendThread;
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__msabi extern typeof(WriteFile) *const __imp_WriteFile;
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int WinThreadLaunch(struct Delivery *, long, int (*)(struct Delivery *), long);
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static textwindows unsigned long StrLen(const char *s) {
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unsigned long n = 0;
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while (*s++) ++n;
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return n;
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}
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static textwindows void Log(const char *s) {
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#if IsModeDbg()
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__imp_WriteFile(__imp_GetStdHandle(kNtStdErrorHandle), s, StrLen(s), 0, 0);
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#endif
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}
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/**
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* Executes signal handler asynchronously inside other thread.
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*
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* @return 0 on success, or -1 on error
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*/
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textwindows int _pthread_signal(struct PosixThread *pt, int sig, int sic) {
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int rc = -1;
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intptr_t th;
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if ((th = __imp_OpenThread(
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kNtThreadSuspendResume | kNtThreadGetContext, false,
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atomic_load_explicit(&pt->tib->tib_tid, memory_order_acquire)))) {
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uint32_t old_suspend_count;
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if ((old_suspend_count = __imp_SuspendThread(th)) != -1u) {
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if (!old_suspend_count &&
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atomic_load_explicit(&pt->status, memory_order_acquire) <
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kPosixThreadTerminated) {
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struct NtContext nc = {.ContextFlags = kNtContextAll};
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struct Delivery pkg = {0, sig, sic, &nc};
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if (__imp_GetThreadContext(th, &nc)) {
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struct CosmoTib *mytls;
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mytls = __get_tls();
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__set_tls_win32(pt->tib);
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rc = WinThreadLaunch(
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&pkg, 0, __sig_tramp,
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ROUNDDOWN(nc.Rsp - kRedzoneSize, kStackAlign) - 8);
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__imp_SetThreadContext(th, &nc);
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__set_tls_win32(mytls);
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} else {
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Log("GetThreadContext failed\n");
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}
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}
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__imp_ResumeThread(th);
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} else {
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Log("SuspendThread failed\n");
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}
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__imp_CloseHandle(th);
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} else {
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Log("OpenThread failed\n");
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}
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return rc;
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}
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#endif /* __x86_64__ */
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