mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 13:52:43 +00:00
87 lines
2.3 KiB
C++
87 lines
2.3 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <bits/pthread_cancel.h>
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <sys/poll.h>
|
|
#include <sys/select.h>
|
|
#include <sys/time.h>
|
|
#include <syscall.h>
|
|
|
|
#include <AK/Vector.h>
|
|
|
|
extern "C" {
|
|
|
|
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/select.html
|
|
int select(int nfds, fd_set* readfds, fd_set* writefds, fd_set* exceptfds, timeval* timeout_tv)
|
|
{
|
|
__pthread_maybe_cancel();
|
|
|
|
timespec* timeout_ts = nullptr;
|
|
timespec timeout;
|
|
if (timeout_tv) {
|
|
timeout_ts = &timeout;
|
|
TIMEVAL_TO_TIMESPEC(timeout_tv, timeout_ts);
|
|
}
|
|
return pselect(nfds, readfds, writefds, exceptfds, timeout_ts, nullptr);
|
|
}
|
|
|
|
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/pselect.html
|
|
int pselect(int nfds, fd_set* readfds, fd_set* writefds, fd_set* exceptfds, timespec const* timeout, sigset_t const* sigmask)
|
|
{
|
|
__pthread_maybe_cancel();
|
|
|
|
Vector<pollfd, FD_SETSIZE> fds;
|
|
|
|
if (nfds < 0 || static_cast<size_t>(nfds) >= fds.capacity())
|
|
return EINVAL;
|
|
|
|
for (int fd = 0; fd < nfds; fd++) {
|
|
short events = 0;
|
|
if (readfds && FD_ISSET(fd, readfds))
|
|
events |= POLLIN;
|
|
if (writefds && FD_ISSET(fd, writefds))
|
|
events |= POLLOUT;
|
|
if (exceptfds && FD_ISSET(fd, exceptfds))
|
|
events |= POLLPRI;
|
|
if (!events)
|
|
continue;
|
|
|
|
fds.unchecked_append({ fd, events, 0 });
|
|
}
|
|
|
|
if (ppoll(fds.data(), fds.size(), timeout, sigmask) < 0)
|
|
return -1;
|
|
|
|
if (readfds)
|
|
FD_ZERO(readfds);
|
|
if (writefds)
|
|
FD_ZERO(writefds);
|
|
if (exceptfds)
|
|
FD_ZERO(exceptfds);
|
|
|
|
int marked_fd_count = 0;
|
|
for (auto& fd_entry : fds) {
|
|
if (fd_entry.revents == 0)
|
|
continue;
|
|
if (readfds && (fd_entry.revents & POLLIN)) {
|
|
FD_SET(fd_entry.fd, readfds);
|
|
marked_fd_count++;
|
|
}
|
|
if (writefds && (fd_entry.revents & POLLOUT)) {
|
|
FD_SET(fd_entry.fd, writefds);
|
|
marked_fd_count++;
|
|
}
|
|
if (exceptfds && (fd_entry.revents & (POLLPRI | POLLERR | POLLHUP))) {
|
|
FD_SET(fd_entry.fd, exceptfds);
|
|
marked_fd_count++;
|
|
}
|
|
}
|
|
|
|
return marked_fd_count;
|
|
}
|
|
}
|