mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
60cb435cb4
If threads are being used, then fork() will now acquire and release and runtime locks so that fork() may be safely used from threads. This also makes vfork() thread safe, because pthread mutexes will do nothing when the process is a child of vfork(). More torture tests have been written to confirm this all works like a charm. Additionally: - Invent hexpcpy() api - Rename nsync_malloc_() to kmalloc() - Complete posix named semaphore implementation - Make pthread_create() asynchronous signal safe - Add rm, rmdir, and touch to command interpreter builtins - Invent sigisprecious() and modify sigset functions to use it - Add unit tests for posix_spawn() attributes and fix its bugs One unresolved problem is the reclaiming of *NSYNC waiter memory in the forked child processes, within apps which have threads waiting on locks
149 lines
5.3 KiB
C
149 lines
5.3 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 2020 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/state.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/intrin/describebacktrace.internal.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/nt/enum/exceptionhandleractions.h"
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#include "libc/nt/enum/signal.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/struct/ntexceptionpointers.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/sa.h"
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#include "libc/sysv/consts/sicode.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/thread/tls.h"
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#include "libc/thread/tls2.h"
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privileged unsigned __wincrash(struct NtExceptionPointers *ep) {
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int64_t rip;
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int sig, code;
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ucontext_t ctx;
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struct CosmoTib *tib;
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static bool noreentry;
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if ((tib = __tls_enabled ? __get_tls_privileged() : 0)) {
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if (~tib->tib_flags & TIB_FLAG_WINCRASHING) {
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tib->tib_flags |= TIB_FLAG_WINCRASHING;
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} else {
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WincrashPanic:
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STRACE("panic: wincrash reentry: rip %x bt %s", ep->ContextRecord->Rip,
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DescribeBacktrace((struct StackFrame *)ep->ContextRecord->Rbp));
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ExitProcess(89);
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}
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} else {
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if (!noreentry) {
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noreentry = true;
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} else {
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goto WincrashPanic;
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}
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}
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STRACE("__wincrash");
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switch (ep->ExceptionRecord->ExceptionCode) {
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case kNtSignalBreakpoint:
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code = TRAP_BRKPT;
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sig = SIGTRAP;
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break;
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case kNtSignalIllegalInstruction:
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code = ILL_ILLOPC;
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sig = SIGILL;
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break;
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case kNtSignalPrivInstruction:
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code = ILL_PRVOPC;
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sig = SIGILL;
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break;
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case kNtSignalGuardPage:
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case kNtSignalInPageError:
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code = SEGV_MAPERR;
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sig = SIGSEGV;
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break;
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case kNtSignalAccessViolation:
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code = SEGV_ACCERR;
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sig = SIGSEGV;
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break;
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case kNtSignalInvalidHandle:
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case kNtSignalInvalidParameter:
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case kNtSignalAssertionFailure:
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code = SI_USER;
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sig = SIGABRT;
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break;
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case kNtSignalFltDivideByZero:
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code = FPE_FLTDIV;
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sig = SIGFPE;
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break;
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case kNtSignalFltOverflow:
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code = FPE_FLTOVF;
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sig = SIGFPE;
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break;
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case kNtSignalFltUnderflow:
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code = FPE_FLTUND;
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sig = SIGFPE;
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break;
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case kNtSignalFltInexactResult:
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code = FPE_FLTRES;
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sig = SIGFPE;
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break;
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case kNtSignalFltDenormalOperand:
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case kNtSignalFltInvalidOperation:
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case kNtSignalFltStackCheck:
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case kNtSignalIntegerDivideByZero:
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case kNtSignalFloatMultipleFaults:
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case kNtSignalFloatMultipleTraps:
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code = FPE_FLTINV;
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sig = SIGFPE;
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break;
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case kNtSignalDllNotFound:
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case kNtSignalOrdinalNotFound:
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case kNtSignalEntrypointNotFound:
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case kNtSignalDllInitFailed:
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code = SI_KERNEL;
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sig = SIGSYS;
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break;
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default:
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return kNtExceptionContinueSearch;
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}
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rip = ep->ContextRecord->Rip;
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if (__sighandflags[sig] & SA_SIGINFO) {
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_ntcontext2linux(&ctx, ep->ContextRecord);
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__sig_handle(false, sig, code, &ctx);
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_ntlinux2context(ep->ContextRecord, &ctx);
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} else {
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__sig_handle(false, sig, code, 0);
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}
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// Windows seems to be the only operating system that traps INT3 at
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// addressof(INT3) rather than addressof(INT3)+1. So we must adjust
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// RIP to prevent the same INT3 from being trapped forevermore.
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if (sig == SIGTRAP && rip == ep->ContextRecord->Rip) {
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ep->ContextRecord->Rip++;
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}
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noreentry = false;
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if (tib) {
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tib->tib_flags &= ~TIB_FLAG_WINCRASHING;
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}
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return kNtExceptionContinueExecution;
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}
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