jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <AK/Time.h>
8#include <Kernel/Process.h>
9#include <Kernel/Time/TimeManagement.h>
10
11namespace Kernel {
12
13ErrorOr<FlatPtr> Process::sys$map_time_page()
14{
15 VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
16 TRY(require_promise(Pledge::stdio));
17
18 auto& vmobject = TimeManagement::the().time_page_vmobject();
19
20 return address_space().with([&](auto& space) -> ErrorOr<FlatPtr> {
21 auto* region = TRY(space->allocate_region_with_vmobject(Memory::RandomizeVirtualAddress::Yes, {}, PAGE_SIZE, PAGE_SIZE, vmobject, 0, "Kernel time page"sv, PROT_READ, true));
22 return region->vaddr().get();
23 });
24}
25
26ErrorOr<FlatPtr> Process::sys$clock_gettime(clockid_t clock_id, Userspace<timespec*> user_ts)
27{
28 VERIFY_NO_PROCESS_BIG_LOCK(this);
29 TRY(require_promise(Pledge::stdio));
30
31 TRY(TimeManagement::validate_clock_id(clock_id));
32
33 auto ts = TimeManagement::the().current_time(clock_id).to_timespec();
34 TRY(copy_to_user(user_ts, &ts));
35 return 0;
36}
37
38ErrorOr<FlatPtr> Process::sys$clock_settime(clockid_t clock_id, Userspace<timespec const*> user_ts)
39{
40 VERIFY_NO_PROCESS_BIG_LOCK(this);
41 TRY(require_promise(Pledge::settime));
42
43 auto credentials = this->credentials();
44 if (!credentials->is_superuser())
45 return EPERM;
46
47 auto time = TRY(copy_time_from_user(user_ts));
48
49 switch (clock_id) {
50 case CLOCK_REALTIME:
51 TimeManagement::the().set_epoch_time(time);
52 break;
53 default:
54 return EINVAL;
55 }
56 return 0;
57}
58
59ErrorOr<FlatPtr> Process::sys$clock_nanosleep(Userspace<Syscall::SC_clock_nanosleep_params const*> user_params)
60{
61 VERIFY_NO_PROCESS_BIG_LOCK(this);
62 TRY(require_promise(Pledge::stdio));
63 auto params = TRY(copy_typed_from_user(user_params));
64
65 auto requested_sleep = TRY(copy_time_from_user(params.requested_sleep));
66
67 bool is_absolute;
68 switch (params.flags) {
69 case 0:
70 is_absolute = false;
71 break;
72 case TIMER_ABSTIME:
73 is_absolute = true;
74 break;
75 default:
76 return EINVAL;
77 }
78
79 TRY(TimeManagement::validate_clock_id(params.clock_id));
80
81 bool was_interrupted;
82 if (is_absolute) {
83 was_interrupted = Thread::current()->sleep_until(params.clock_id, requested_sleep).was_interrupted();
84 } else {
85 Time remaining_sleep;
86 was_interrupted = Thread::current()->sleep(params.clock_id, requested_sleep, &remaining_sleep).was_interrupted();
87 timespec remaining_sleep_ts = remaining_sleep.to_timespec();
88 if (was_interrupted && params.remaining_sleep) {
89 TRY(copy_to_user(params.remaining_sleep, &remaining_sleep_ts));
90 }
91 }
92 if (was_interrupted)
93 return EINTR;
94 return 0;
95}
96
97ErrorOr<FlatPtr> Process::sys$clock_getres(Userspace<Syscall::SC_clock_getres_params const*> user_params)
98{
99 VERIFY_NO_PROCESS_BIG_LOCK(this);
100 auto params = TRY(copy_typed_from_user(user_params));
101
102 TRY(TimeManagement::validate_clock_id(params.clock_id));
103
104 auto ts = TimeManagement::the().clock_resolution().to_timespec();
105 TRY(copy_to_user(params.result, &ts));
106 return 0;
107}
108
109ErrorOr<FlatPtr> Process::sys$adjtime(Userspace<timeval const*> user_delta, Userspace<timeval*> user_old_delta)
110{
111 VERIFY_NO_PROCESS_BIG_LOCK(this);
112 if (user_old_delta) {
113 timespec old_delta_ts = TimeManagement::the().remaining_epoch_time_adjustment();
114 timeval old_delta;
115 timespec_to_timeval(old_delta_ts, old_delta);
116 TRY(copy_to_user(user_old_delta, &old_delta));
117 }
118
119 if (user_delta) {
120 TRY(require_promise(Pledge::settime));
121 auto credentials = this->credentials();
122 if (!credentials->is_superuser())
123 return EPERM;
124 auto delta = TRY(copy_time_from_user(user_delta));
125
126 // FIXME: Should use AK::Time internally
127 TimeManagement::the().set_remaining_epoch_time_adjustment(delta.to_timespec());
128 }
129
130 return 0;
131}
132
133}