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https://github.com/jart/cosmopolitan.git
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155b378a39
The organization of the source files is now much more rational. Old experiments that didn't work out are now deleted. Naming of things like files is now more intuitive.
77 lines
3.4 KiB
C
77 lines
3.4 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/strace.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/thread/tls.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/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, 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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} else if (sig == SIGFPE) {
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RaiseSigFpe();
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rc = 0;
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} else if (!IsWindows()) {
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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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