Reviewed by: kib MFC after: 1 week Differential revision: https://reviews.freebsd.org/D36714
135 lines
4.1 KiB
C
135 lines
4.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2023 Johannes Totz
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <string.h>
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#include <sysexits.h>
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#include <unistd.h>
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#include <sys/efiio.h>
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static void usage(void)
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{
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printf("Usage:\n"
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" efiwake -- print out current EFI time and wake time\n"
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" efiwake -d -- disable wake time\n"
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" efiwake -e yyyy-mm-ddThh:mm:ss -- enable wake time\n"
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);
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exit(EX_USAGE);
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}
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int main(int argc, char **argv)
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{
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struct efi_waketime_ioc waketime;
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int error, ch;
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bool enable = false, disable = false;
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memset(&waketime, 0, sizeof(waketime));
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while ((ch = getopt(argc, argv, "de:")) != -1) {
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switch (ch) {
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case 'd':
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disable = true;
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break;
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case 'e':
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if (sscanf(optarg,
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"%hu-%02hhu-%02hhuT%02hhu:%02hhu:%02hhu",
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&waketime.waketime.tm_year, &waketime.waketime.tm_mon,
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&waketime.waketime.tm_mday, &waketime.waketime.tm_hour,
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&waketime.waketime.tm_min, &waketime.waketime.tm_sec)
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!= 6) {
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usage();
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}
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enable = true;
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break;
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case '?':
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (argc > 0)
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usage();
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if (disable && enable)
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usage();
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int efi_fd = open("/dev/efi", O_RDWR);
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if (efi_fd < 0)
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err(EX_OSERR, "cannot open /dev/efi");
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struct efi_tm now;
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error = ioctl(efi_fd, EFIIOC_GET_TIME, &now);
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if (error != 0)
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err(EX_OSERR, "cannot get EFI time");
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/* EFI's time can be different from kernel's time. */
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printf("Current EFI time: %u-%02u-%02uT%02u:%02u:%02u\n",
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now.tm_year, now.tm_mon, now.tm_mday, now.tm_hour, now.tm_min,
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now.tm_sec);
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if (disable) {
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/* It's tempting to preserve the current timer value.
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* However, wonky EFI implementations sometimes return bogus
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* dates for the wake timer and would then fail disabling it
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* here.
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* A safe timer value is the current EFI time.
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*/
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waketime.waketime = now;
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waketime.enabled = 0;
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error = ioctl(efi_fd, EFIIOC_SET_WAKETIME, &waketime);
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if (error != 0)
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err(EX_OSERR, "cannot disable EFI wake time");
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}
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if (enable) {
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waketime.enabled = 1;
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error = ioctl(efi_fd, EFIIOC_SET_WAKETIME, &waketime);
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if (error != 0)
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err(EX_OSERR, "cannot enable EFI wake time");
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}
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/* Confirm to user what the wake time has been set to. */
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error = ioctl(efi_fd, EFIIOC_GET_WAKETIME, &waketime);
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if (error != 0)
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err(EX_OSERR, "cannot get EFI wake time");
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printf("EFI wake time: %u-%02u-%02uT%02u:%02u:%02u; enabled=%i, pending=%i\n",
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waketime.waketime.tm_year, waketime.waketime.tm_mon,
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waketime.waketime.tm_mday, waketime.waketime.tm_hour,
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waketime.waketime.tm_min, waketime.waketime.tm_sec,
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waketime.enabled, waketime.pending);
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close(efi_fd);
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return (0);
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}
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