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99dc1281f5
The new asynchronous signal delivery technique is now also being used for tkill(), raise(), etc. Many subtle issues have been addresesd. We now signal handling on Windows that's remarkably similar to the POSIX behaviors. However that's just across threads. We're lacking a way to have the signal semantics work well, across multiple WIN32 processes.
110 lines
4.8 KiB
C
110 lines
4.8 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/calls/bo.internal.h"
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#include "libc/calls/cp.internal.h"
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#include "libc/calls/struct/sigset.h"
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#include "libc/calls/struct/sigset.internal.h"
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#include "libc/calls/struct/timespec.h"
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#include "libc/calls/struct/timespec.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/sock/struct/pollfd.h"
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#include "libc/sock/struct/pollfd.internal.h"
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#include "libc/stdckdint.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Waits for something to happen on multiple file descriptors at once.
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*
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* This function is the same as saying:
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*
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* sigset_t old;
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* sigprocmask(SIG_SETMASK, sigmask, &old);
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* poll(fds, nfds, timeout);
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* sigprocmask(SIG_SETMASK, old, 0);
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*
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* Except it happens atomically when the kernel supports doing that. On
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* kernel such as XNU and NetBSD which don't, this wrapper will fall
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* back to using the example above. Consider using pselect() which is
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* atomic on all supported platforms.
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*
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* The Linux Kernel modifies the timeout parameter. This wrapper gives
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* it a local variable due to POSIX requiring that `timeout` be const.
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* If you need that information from the Linux Kernel use sys_ppoll().
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*
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* @param timeout if null will block indefinitely
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* @param sigmask may be null in which case no mask change happens
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* @raise ECANCELED if thread was cancelled in masked mode
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* @raise EINTR if signal was delivered
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* @cancellationpoint
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* @asyncsignalsafe
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* @threadsafe
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* @norestart
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*/
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int ppoll(struct pollfd *fds, size_t nfds, const struct timespec *timeout,
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const sigset_t *sigmask) {
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size_t n;
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int e, rc;
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uint64_t millis;
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sigset_t oldmask;
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struct timespec ts, *tsp;
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BEGIN_CANCELLATION_POINT;
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if (IsAsan() &&
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(ckd_mul(&n, nfds, sizeof(struct pollfd)) || !__asan_is_valid(fds, n) ||
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(timeout && !__asan_is_valid(timeout, sizeof(timeout))) ||
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(sigmask && !__asan_is_valid(sigmask, sizeof(sigmask))))) {
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rc = efault();
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} else if (!IsWindows()) {
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e = errno;
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if (timeout) {
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ts = *timeout;
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tsp = &ts;
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} else {
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tsp = 0;
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}
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rc = sys_ppoll(fds, nfds, tsp, sigmask, 8);
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if (rc == -1 && errno == ENOSYS) {
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errno = e;
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if (!timeout ||
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ckd_add(&millis, timeout->tv_sec, timeout->tv_nsec / 1000000)) {
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millis = -1;
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}
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if (sigmask) sys_sigprocmask(SIG_SETMASK, sigmask, &oldmask);
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rc = poll(fds, nfds, millis);
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if (sigmask) sys_sigprocmask(SIG_SETMASK, &oldmask, 0);
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}
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} else {
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if (!timeout ||
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ckd_add(&millis, timeout->tv_sec, timeout->tv_nsec / 1000000)) {
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millis = -1;
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}
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BEGIN_BLOCKING_OPERATION;
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rc = sys_poll_nt(fds, nfds, &millis, sigmask);
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END_BLOCKING_OPERATION;
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}
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END_CANCELLATION_POINT;
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STRACE("ppoll(%s, %'zu, %s, %s) → %d% lm", DescribePollFds(rc, fds, nfds),
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nfds, DescribeTimespec(0, timeout), DescribeSigset(0, sigmask), rc);
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return rc;
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}
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