mirror of
https://github.com/jart/cosmopolitan.git
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107 lines
4.1 KiB
C
107 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 et 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/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/limits.h"
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#include "libc/macros.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/sysv/consts/poll.h"
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#include "libc/sysv/errfuns.h"
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#ifdef __x86_64__
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// <sync libc/sysv/consts.sh>
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#define POLLERR_ 0x0001 // implied in events
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#define POLLHUP_ 0x0002 // implied in events
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#define POLLNVAL_ 0x0004 // implied in events
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#define POLLIN_ 0x0300
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#define POLLRDNORM_ 0x0100
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#define POLLRDBAND_ 0x0200
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#define POLLOUT_ 0x0010
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#define POLLWRNORM_ 0x0010
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#define POLLWRBAND_ 0x0020 // MSDN undocumented
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#define POLLPRI_ 0x0400 // MSDN unsupported
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// </sync libc/sysv/consts.sh>
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int sys_select_nt(int nfds, fd_set *readfds, fd_set *writefds,
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fd_set *exceptfds, const struct timespec *timeout,
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const sigset_t *sigmask) {
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int pfds = 0;
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// convert bitsets to pollfd
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struct pollfd fds[128];
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for (int fd = 0; fd < nfds; ++fd) {
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int events = 0;
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if (readfds && FD_ISSET(fd, readfds))
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events |= POLLIN_;
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if (writefds && FD_ISSET(fd, writefds))
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events |= POLLOUT_;
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if (exceptfds && FD_ISSET(fd, exceptfds))
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events |= POLLPRI_;
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if (events) {
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if (pfds == ARRAYLEN(fds))
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return e2big();
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fds[pfds].fd = fd;
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fds[pfds].events = events;
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fds[pfds].revents = 0;
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++pfds;
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}
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}
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// call our nt poll implementation
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int fdcount = sys_poll_nt(fds, pfds, timeout, sigmask);
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if (fdcount == -1)
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return -1;
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// convert pollfd back to bitsets
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if (readfds)
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FD_ZERO(readfds);
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if (writefds)
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FD_ZERO(writefds);
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if (exceptfds)
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FD_ZERO(exceptfds);
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int bits = 0;
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for (int i = 0; i < pfds; ++i) {
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if (fds[i].revents & (POLLIN_ | POLLHUP_ | POLLERR_ | POLLNVAL_)) {
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if (readfds) {
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FD_SET(fds[i].fd, readfds);
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++bits;
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}
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}
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if (fds[i].revents & POLLOUT_) {
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if (writefds) {
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FD_SET(fds[i].fd, writefds);
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++bits;
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}
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}
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if (fds[i].revents & POLLPRI_) {
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if (exceptfds) {
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FD_SET(fds[i].fd, exceptfds);
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++bits;
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}
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}
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}
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return bits;
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}
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#endif /* __x86_64__ */
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