mirror of
https://github.com/jart/cosmopolitan.git
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dc0ea6640e
This change makes further effort towards improving our poll() implementation on the New Technology. The stdin worker didn't work out so well for Python so it's not being used for now. System call tracing with the --strace flag should now be less noisy now on Windows unless you modify the strace.internal.h defines to turn on some optional ones that are most useful for debugging the system call wrappers.
100 lines
4.1 KiB
C
100 lines
4.1 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/bits/weaken.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/sig.internal.h"
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#include "libc/calls/sigbits.h"
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#include "libc/calls/strace.internal.h"
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#include "libc/calls/struct/sigset.h"
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#include "libc/dce.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/log/backtrace.internal.h"
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#include "libc/nt/errors.h"
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#include "libc/nt/synchronization.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Blocks until SIG ∉ MASK is delivered to process.
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*
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* This temporarily replaces the signal mask until a signal that it
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* doesn't contain is delivered.
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*
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* @param ignore is a bitset of signals to block temporarily, which if
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* NULL is equivalent to passing an empty signal set
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* @return -1 w/ EINTR (or possibly EFAULT)
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* @asyncsignalsafe
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* @norestart
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*/
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int sigsuspend(const sigset_t *ignore) {
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int rc;
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char buf[41];
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long ms, totoms;
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sigset_t save, mask, *arg;
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STRACE("sigsuspend(%s) → ...", __strace_sigset(buf, sizeof(buf), 0, ignore));
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if (IsAsan() && ignore && !__asan_is_valid(ignore, sizeof(*ignore))) {
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rc = efault();
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} else if (IsXnu() || IsOpenbsd()) {
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// openbsd and xnu only support 32 signals
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// they use a register calling convention for sigsuspend
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if (ignore) {
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arg = (sigset_t *)(uintptr_t)(*(uint32_t *)ignore);
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} else {
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arg = 0;
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}
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rc = sys_sigsuspend(arg, 8);
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} else if (IsLinux() || IsFreebsd() || IsNetbsd() || IsWindows()) {
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if (ignore) {
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arg = ignore;
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} else {
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sigemptyset(&mask);
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arg = &mask;
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}
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if (!IsWindows()) {
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rc = sys_sigsuspend(arg, 8);
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} else {
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__sig_mask(SIG_SETMASK, arg, &save);
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ms = 0;
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totoms = 0;
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do {
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if (_check_interrupts(false, g_fds.p)) {
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rc = eintr();
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break;
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}
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if (SleepEx(__SIG_POLLING_INTERVAL_MS, true) == kNtWaitIoCompletion) {
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POLLTRACE("IOCP EINTR");
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continue;
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}
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#if defined(SYSDEBUG) && defined(_POLLTRACE)
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ms += __SIG_POLLING_INTERVAL_MS;
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if (ms >= __SIG_LOGGING_INTERVAL_MS) {
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totoms += ms, ms = 0;
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POLLTRACE("... sigsuspending for %'lums...", totoms);
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}
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#endif
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} while (1);
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__sig_mask(SIG_SETMASK, &save, 0);
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}
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} else {
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// TODO(jart): sigsuspend metal support
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rc = enosys();
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}
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STRACE("...sigsuspend → %d% m", rc);
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return rc;
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}
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