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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright (C) 2020 Intel Corporation
- * Author: Johannes Berg <[email protected]>
- */
- #include <stdbool.h>
- #include <os.h>
- #include <errno.h>
- #include <sched.h>
- #include <unistd.h>
- #include <kern_util.h>
- #include <sys/select.h>
- #include <stdio.h>
- #include <sys/timerfd.h>
- #include "rtc.h"
- static int uml_rtc_irq_fds[2];
- void uml_rtc_send_timetravel_alarm(void)
- {
- unsigned long long c = 1;
- CATCH_EINTR(write(uml_rtc_irq_fds[1], &c, sizeof(c)));
- }
- int uml_rtc_start(bool timetravel)
- {
- int err;
- if (timetravel) {
- int err = os_pipe(uml_rtc_irq_fds, 1, 1);
- if (err)
- goto fail;
- } else {
- uml_rtc_irq_fds[0] = timerfd_create(CLOCK_REALTIME, TFD_CLOEXEC);
- if (uml_rtc_irq_fds[0] < 0) {
- err = -errno;
- goto fail;
- }
- /* apparently timerfd won't send SIGIO, use workaround */
- sigio_broken(uml_rtc_irq_fds[0]);
- err = add_sigio_fd(uml_rtc_irq_fds[0]);
- if (err < 0) {
- close(uml_rtc_irq_fds[0]);
- goto fail;
- }
- }
- return uml_rtc_irq_fds[0];
- fail:
- uml_rtc_stop(timetravel);
- return err;
- }
- int uml_rtc_enable_alarm(unsigned long long delta_seconds)
- {
- struct itimerspec it = {
- .it_value = {
- .tv_sec = delta_seconds,
- },
- };
- if (timerfd_settime(uml_rtc_irq_fds[0], 0, &it, NULL))
- return -errno;
- return 0;
- }
- void uml_rtc_disable_alarm(void)
- {
- uml_rtc_enable_alarm(0);
- }
- void uml_rtc_stop(bool timetravel)
- {
- if (timetravel)
- os_close_file(uml_rtc_irq_fds[1]);
- else
- ignore_sigio_fd(uml_rtc_irq_fds[0]);
- os_close_file(uml_rtc_irq_fds[0]);
- }
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