mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 03:27:39 +00:00
f0701d2a24
- Polyfill pselect() on Windows - Add -O NOFILE flag to pledge.com - Polyfill ppoll() on NetBSD, XNU, and Windows - Support negative numbers and errno in sizetol() - Add .RSS, .NOFILE, and .MAXCORE to Landlock Make - Fix issue with .PLEDGE preventing touching of output files - Add __watch() function (like ftrace) for logging memory changes
82 lines
3.7 KiB
C
82 lines
3.7 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/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/sysv/consts/poll.h"
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#include "libc/sysv/errfuns.h"
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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 || __builtin_add_overflow(timeout->tv_sec,
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timeout->tv_usec / 1000, &millis)) {
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millis = -1;
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}
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// call our nt poll implementation
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fdcount = sys_poll_nt(fds, pfds, &millis, sigmask);
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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->tv_sec = millis / 1000;
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timeout->tv_usec = millis % 1000 * 1000;
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}
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return fdcount;
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}
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