mirror of
https://github.com/jart/cosmopolitan.git
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80 lines
3.5 KiB
C
80 lines
3.5 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/calls.h"
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#include "libc/calls/sig.internal.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/runtime/internal.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/xnu.internal.h"
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static textwindows inline bool HasWorkingConsole(void) {
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return !!(__ntconsolemode[0] | __ntconsolemode[1] | __ntconsolemode[2]);
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}
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static noubsan void RaiseSigFpe(void) {
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volatile int x = 0;
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x = 1 / x;
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}
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/**
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* Sends signal to self.
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*
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* This is basically the same as:
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*
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* tkill(gettid(), sig);
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*
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* Note `SIG_DFL` still results in process death for most signals.
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*
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* This function is not entirely equivalent to kill() or tkill(). For
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* example, we raise `SIGTRAP` and `SIGFPE` the natural way, since that
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* helps us support Windows. So if the raised signal has a signal
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* handler, then the reported `si_code` might not be `SI_TKILL`.
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*
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* On Windows, if a signal results in the termination of the process
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* then we use the convention `_Exit(128 + sig)` to notify the parent of
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* the signal number.
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*
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* @param sig can be SIGALRM, SIGINT, SIGTERM, SIGKILL, etc.
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* @return 0 if signal was delivered and returned, or -1 w/ errno
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* @asyncsignalsafe
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*/
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int raise(int sig) {
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int rc, tid, event;
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STRACE("raise(%G) → ...", sig);
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if (sig == SIGTRAP) {
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DebugBreak();
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rc = 0;
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#ifndef __aarch64__
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} else if (sig == SIGFPE) {
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// TODO(jart): Why doesn't AARCH64 raise SIGFPE?
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RaiseSigFpe();
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rc = 0;
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#endif
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} else if (!IsWindows() && !IsMetal()) {
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rc = sys_tkill(gettid(), sig, 0);
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} else {
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rc = __sig_raise(sig, SI_TKILL);
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}
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STRACE("...raise(%G) → %d% m", sig, rc);
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return rc;
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}
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