1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2023 Johannes Totz
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/efiio.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
static void
usage(void)
{
fprintf(stderr, "Usage:\n"
" efiwake -- print out current "
"EFI time and wake time\n"
" efiwake -d -- disable wake time\n"
" efiwake -e yyyy-mm-ddThh:mm:ss -- enable wake time\n"
);
exit(EX_USAGE);
}
int
main(int argc, char **argv)
{
struct efi_tm now;
struct efi_waketime_ioc waketime;
int ch, error, efi_fd;
bool disable = false, enable = false;
memset(&waketime, 0, sizeof(waketime));
while ((ch = getopt(argc, argv, "de:")) != -1) {
switch (ch) {
case 'd':
disable = true;
break;
case 'e':
if (sscanf(optarg,
"%hu-%02hhu-%02hhuT%02hhu:%02hhu:%02hhu",
&waketime.waketime.tm_year,
&waketime.waketime.tm_mon,
&waketime.waketime.tm_mday,
&waketime.waketime.tm_hour,
&waketime.waketime.tm_min,
&waketime.waketime.tm_sec) != 6) {
usage();
}
enable = true;
break;
case '?':
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc > 0)
usage();
if (disable && enable)
usage();
efi_fd = open("/dev/efi", O_RDWR);
if (efi_fd < 0)
err(EX_OSERR, "cannot open /dev/efi");
error = ioctl(efi_fd, EFIIOC_GET_TIME, &now);
if (error != 0)
err(EX_OSERR, "cannot get EFI time");
/* EFI's time can be different from kernel's time. */
printf("Current EFI time: %u-%02u-%02uT%02u:%02u:%02u\n",
now.tm_year, now.tm_mon, now.tm_mday, now.tm_hour, now.tm_min,
now.tm_sec);
if (disable) {
/*
* It's tempting to preserve the current timer value.
* However, wonky EFI implementations sometimes return bogus
* dates for the wake timer and would then fail disabling it
* here.
* A safe timer value is the current EFI time.
*/
waketime.waketime = now;
waketime.enabled = 0;
error = ioctl(efi_fd, EFIIOC_SET_WAKETIME, &waketime);
if (error != 0)
err(EX_OSERR, "cannot disable EFI wake time");
}
if (enable) {
waketime.enabled = 1;
error = ioctl(efi_fd, EFIIOC_SET_WAKETIME, &waketime);
if (error != 0)
err(EX_OSERR, "cannot enable EFI wake time");
}
/* Confirm to user what the wake time has been set to. */
error = ioctl(efi_fd, EFIIOC_GET_WAKETIME, &waketime);
if (error != 0)
err(EX_OSERR, "cannot get EFI wake time");
printf("EFI wake time: %u-%02u-%02uT%02u:%02u:%02u; "
"enabled=%i, pending=%i\n",
waketime.waketime.tm_year, waketime.waketime.tm_mon,
waketime.waketime.tm_mday, waketime.waketime.tm_hour,
waketime.waketime.tm_min, waketime.waketime.tm_sec,
waketime.enabled, waketime.pending);
close(efi_fd);
return (0);
}
|
