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https://github.com/jart/cosmopolitan.git
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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.
100 lines
4.5 KiB
C
100 lines
4.5 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/assert.h"
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#include "libc/calls/bo.internal.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/errno.h"
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#include "libc/nt/enum/wait.h"
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#include "libc/nt/enum/wsa.h"
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#include "libc/nt/errors.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/synchronization.h"
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#include "libc/nt/thread.h"
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#include "libc/nt/winsock.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sock/internal.h"
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#include "libc/sock/sock.h"
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#include "libc/sock/syscall_fd.internal.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/errfuns.h"
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static textwindows void __wsablock_abort(int64_t handle,
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struct NtOverlapped *overlapped) {
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unassert(CancelIoEx(handle, overlapped) ||
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GetLastError() == kNtErrorNotFound);
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}
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textwindows int __wsablock(struct Fd *fd, struct NtOverlapped *overlapped,
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uint32_t *flags, int sigops, uint32_t timeout) {
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uint32_t i, got;
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int rc, abort_errno;
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if (WSAGetLastError() != kNtErrorIoPending) {
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// our i/o operation never happened because it failed
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return __winsockerr();
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}
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BEGIN_BLOCKING_OPERATION;
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// our i/o operation is in flight and it needs to block
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abort_errno = EAGAIN;
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if (fd->flags & O_NONBLOCK) {
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__wsablock_abort(fd->handle, overlapped);
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} else if (_check_interrupts(sigops)) {
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Interrupted:
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abort_errno = errno; // EINTR or ECANCELED
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__wsablock_abort(fd->handle, overlapped);
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} else {
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for (;;) {
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i = WSAWaitForMultipleEvents(1, &overlapped->hEvent, true,
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__SIG_POLLING_INTERVAL_MS, true);
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if (i == kNtWaitFailed || i == kNtWaitTimeout) {
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if (_check_interrupts(sigops)) {
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goto Interrupted;
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}
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if (i == kNtWaitFailed) {
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// Failure should be an impossible condition, but MSDN lists
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// WSAENETDOWN and WSA_NOT_ENOUGH_MEMORY as possible errors,
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// which we're going to hope are ephemeral.
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SleepEx(__SIG_POLLING_INTERVAL_MS, false);
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}
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if (timeout) {
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if (timeout <= __SIG_POLLING_INTERVAL_MS) {
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__wsablock_abort(fd->handle, overlapped);
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break;
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}
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timeout -= __SIG_POLLING_INTERVAL_MS;
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}
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} else {
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break;
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}
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}
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}
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// overlapped is allocated on stack by caller, so it's important that
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// we wait for win32 to acknowledge that it's done using that memory.
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if (WSAGetOverlappedResult(fd->handle, overlapped, &got, true, flags)) {
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rc = got;
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} else {
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rc = -1;
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if (WSAGetLastError() == kNtErrorOperationAborted) {
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errno = abort_errno;
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}
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}
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END_BLOCKING_OPERATION;
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return rc;
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}
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