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80 lines
1.5 KiB
80 lines
1.5 KiB
// 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 <[email protected]> |
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*/ |
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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(uml_rtc_irq_fds[0]); |
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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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