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33c9da5dfb
The existing sigio workaround implementation removes FDs from the poll when events are triggered, requiring users to re-add them via add_sigio_fd() after processing. This introduces a potential race condition between FD removal in write_sigio_thread() and next_poll update in __add_sigio_fd(), and is inefficient due to frequent FD removal and re-addition. Rewrite the implementation based on epoll and tgkill for improved efficiency and reliability. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Link: https://patch.msgid.link/20250315161910.4082396-2-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg <johannes.berg@intel.com>
82 lines
1.5 KiB
C
82 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020 Intel Corporation
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* Author: Johannes Berg <johannes@sipsolutions.net>
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*/
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#include <stdbool.h>
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#include <os.h>
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#include <errno.h>
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#include <sched.h>
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#include <unistd.h>
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#include <kern_util.h>
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#include <sys/select.h>
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#include <stdio.h>
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#include <sys/timerfd.h>
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#include "rtc.h"
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static int uml_rtc_irq_fds[2];
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void uml_rtc_send_timetravel_alarm(void)
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{
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unsigned long long c = 1;
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CATCH_EINTR(write(uml_rtc_irq_fds[1], &c, sizeof(c)));
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}
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int uml_rtc_start(bool timetravel)
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{
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int err;
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if (timetravel) {
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int err = os_pipe(uml_rtc_irq_fds, 1, 1);
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if (err)
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goto fail;
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} else {
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uml_rtc_irq_fds[0] = timerfd_create(CLOCK_REALTIME, TFD_CLOEXEC);
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if (uml_rtc_irq_fds[0] < 0) {
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err = -errno;
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goto fail;
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}
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/* apparently timerfd won't send SIGIO, use workaround */
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sigio_broken();
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err = add_sigio_fd(uml_rtc_irq_fds[0]);
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if (err < 0) {
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close(uml_rtc_irq_fds[0]);
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goto fail;
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}
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}
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return uml_rtc_irq_fds[0];
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fail:
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uml_rtc_stop(timetravel);
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return err;
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}
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int uml_rtc_enable_alarm(unsigned long long delta_seconds)
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{
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struct itimerspec it = {
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.it_value = {
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.tv_sec = delta_seconds,
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},
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};
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if (timerfd_settime(uml_rtc_irq_fds[0], 0, &it, NULL))
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return -errno;
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return 0;
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}
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void uml_rtc_disable_alarm(void)
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{
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uml_rtc_enable_alarm(0);
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}
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void uml_rtc_stop(bool timetravel)
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{
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if (timetravel)
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os_close_file(uml_rtc_irq_fds[1]);
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else
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ignore_sigio_fd(uml_rtc_irq_fds[0]);
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os_close_file(uml_rtc_irq_fds[0]);
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}
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