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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.
90 lines
3.8 KiB
C
90 lines
3.8 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 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/bo.internal.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/state.internal.h"
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#include "libc/calls/struct/timeval.h"
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#include "libc/macros.internal.h"
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#include "libc/sock/select.h"
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#include "libc/sock/sock.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/poll.h"
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#include "libc/sysv/errfuns.h"
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#ifdef __x86_64__
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int sys_select_nt(int nfds, fd_set *readfds, fd_set *writefds,
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fd_set *exceptfds, struct timeval *timeout,
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const sigset_t *sigmask) {
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uint64_t millis;
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int i, pfds, events, fdcount;
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struct pollfd fds[64];
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// convert bitsets to pollfd
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for (pfds = i = 0; i < nfds; ++i) {
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events = 0;
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if (readfds && FD_ISSET(i, readfds)) events |= POLLIN;
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if (writefds && FD_ISSET(i, writefds)) events |= POLLOUT;
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if (exceptfds && FD_ISSET(i, exceptfds)) events |= POLLERR;
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if (events) {
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if (pfds < ARRAYLEN(fds)) {
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fds[pfds].fd = i;
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fds[pfds].events = events;
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fds[pfds].revents = 0;
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pfds += 1;
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} else {
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return enomem();
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}
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}
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}
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// convert the wait time to a word
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if (!timeout) {
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millis = -1;
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} else {
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millis = timeval_tomillis(*timeout);
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}
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// call our nt poll implementation
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BEGIN_BLOCKING_OPERATION;
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fdcount = sys_poll_nt(fds, pfds, &millis, sigmask);
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END_BLOCKING_OPERATION;
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if (fdcount == -1) return -1;
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// convert pollfd back to bitsets
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if (readfds) FD_ZERO(readfds);
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if (writefds) FD_ZERO(writefds);
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if (exceptfds) FD_ZERO(exceptfds);
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for (i = 0; i < fdcount; ++i) {
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if (fds[i].revents & POLLIN) FD_SET(fds[i].fd, readfds);
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if (fds[i].revents & POLLOUT) FD_SET(fds[i].fd, writefds);
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if (fds[i].revents & (POLLERR | POLLNVAL)) FD_SET(fds[i].fd, exceptfds);
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}
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// store remaining time back in caller's timeval
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if (timeout) {
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*timeout = timeval_frommillis(millis);
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}
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return fdcount;
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}
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#endif /* __x86_64__ */
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