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1f2a5a8fc1
The ShowCrashReports() feature for aarch64 should work even better than the x86 crash reports. Thanks to the benefit of hindsight these reports should be rock solid reliable and beautiful to read. This change also improves the syscall polyfills for aarch64. Some of the sys_foo() functions have been removed, usually because they're legacy or downright footguns not worth building.
76 lines
3.6 KiB
C
76 lines
3.6 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/cp.internal.h"
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#include "libc/calls/syscall_support-nt.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/sock/internal.h"
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/**
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* Waits for signal.
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*
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* This suspends execution until an unmasked signal is delivered. If the
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* signal delivery kills the process, this won't return. The signal mask
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* of the current thread is used. If a signal handler exists, this shall
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* return after it's been invoked.
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*
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* This function is equivalent to:
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*
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* select(0, 0, 0, 0, 0);
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*
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* However this has a tinier footprint and better logging.
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*
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* @return -1 w/ errno set to EINTR
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* @cancellationpoint
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* @see sigsuspend()
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* @norestart
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*/
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int pause(void) {
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int rc;
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STRACE("pause() → [...]");
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BEGIN_CANCELLATION_POINT;
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if (!IsWindows()) {
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// We'll polyfill pause() using select() with a null timeout, which
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// should hopefully do the same thing, which means wait forever but
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// the usual signal interrupt rules apply.
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//
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// "If the readfds, writefds, and errorfds arguments are all null
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// pointers and the timeout argument is not a null pointer, the
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// pselect() or select() function shall block for the time
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// specified, or until interrupted by a signal. If the readfds,
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// writefds, and errorfds arguments are all null pointers and the
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// timeout argument is a null pointer, the pselect() or select()
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// function shall block until interrupted by a signal." ──Quoth
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// IEEE 1003.1-2017 §functions/select
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//
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#ifdef __aarch64__
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rc = sys_pselect(0, 0, 0, 0, 0, 0);
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#else
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rc = sys_select(0, 0, 0, 0, 0);
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#endif
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} else {
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rc = sys_pause_nt();
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}
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END_CANCELLATION_POINT;
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STRACE("[...] pause → %d% m", rc);
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return rc;
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}
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