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https://github.com/jart/cosmopolitan.git
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994e1f4386
Since we're now on Windows 8, we can have clone() work as advertised on Windows, where it sends a futex wake to the child tid. It's also likely we no longer need to work around thread flakes on OpenBSD, in _wait0().
45 lines
2.4 KiB
C
45 lines
2.4 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 2022 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/errno.h"
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#include "libc/intrin/intrin.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/intrin/weaken.h"
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#include "libc/log/backtrace.internal.h"
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/**
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* Shows backtrace if crash reporting facilities are linked.
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*/
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void _bt(const char *fmt, ...) {
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int e;
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va_list va;
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if (fmt) {
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va_start(va, fmt);
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kvprintf(fmt, va);
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va_end(va);
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}
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if (_weaken(ShowBacktrace)) {
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e = errno;
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_weaken(ShowBacktrace)(2, __builtin_frame_address(0));
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errno = e;
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} else {
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kprintf("_bt() can't show backtrace because you need:\n"
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"\tSTATIC_YOINK(\"ShowBacktrace\");\n"
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"to be linked.\n");
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}
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}
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