Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
2/*
3 * time function definitions for NOLIBC
4 * Copyright (C) 2017-2022 Willy Tarreau <w@1wt.eu>
5 */
6
7/* make sure to include all global symbols */
8#include "nolibc.h"
9
10#ifndef _NOLIBC_TIME_H
11#define _NOLIBC_TIME_H
12
13#include "std.h"
14#include "arch.h"
15#include "types.h"
16#include "sys.h"
17
18#include <linux/signal.h>
19#include <linux/time.h>
20
21static __inline__
22void __nolibc_timespec_user_to_kernel(const struct timespec *ts, struct __kernel_timespec *kts)
23{
24 kts->tv_sec = ts->tv_sec;
25 kts->tv_nsec = ts->tv_nsec;
26}
27
28static __inline__
29void __nolibc_timespec_kernel_to_user(const struct __kernel_timespec *kts, struct timespec *ts)
30{
31 ts->tv_sec = kts->tv_sec;
32 ts->tv_nsec = kts->tv_nsec;
33}
34
35/*
36 * int clock_getres(clockid_t clockid, struct timespec *res);
37 * int clock_gettime(clockid_t clockid, struct timespec *tp);
38 * int clock_settime(clockid_t clockid, const struct timespec *tp);
39 * int clock_nanosleep(clockid_t clockid, int flags, const struct timespec *rqtp,
40 * struct timespec *rmtp)
41 */
42
43static __attribute__((unused))
44int sys_clock_getres(clockid_t clockid, struct timespec *res)
45{
46#if defined(__NR_clock_getres)
47 return my_syscall2(__NR_clock_getres, clockid, res);
48#else
49 struct __kernel_timespec kres;
50 int ret;
51
52 ret = my_syscall2(__NR_clock_getres_time64, clockid, &kres);
53 if (res)
54 __nolibc_timespec_kernel_to_user(&kres, res);
55 return ret;
56#endif
57}
58
59static __attribute__((unused))
60int clock_getres(clockid_t clockid, struct timespec *res)
61{
62 return __sysret(sys_clock_getres(clockid, res));
63}
64
65static __attribute__((unused))
66int sys_clock_gettime(clockid_t clockid, struct timespec *tp)
67{
68#if defined(__NR_clock_gettime)
69 return my_syscall2(__NR_clock_gettime, clockid, tp);
70#else
71 struct __kernel_timespec ktp;
72 int ret;
73
74 ret = my_syscall2(__NR_clock_gettime64, clockid, &ktp);
75 if (tp)
76 __nolibc_timespec_kernel_to_user(&ktp, tp);
77 return ret;
78#endif
79}
80
81static __attribute__((unused))
82int clock_gettime(clockid_t clockid, struct timespec *tp)
83{
84 return __sysret(sys_clock_gettime(clockid, tp));
85}
86
87static __attribute__((unused))
88int sys_clock_settime(clockid_t clockid, struct timespec *tp)
89{
90#if defined(__NR_clock_settime)
91 return my_syscall2(__NR_clock_settime, clockid, tp);
92#else
93 struct __kernel_timespec ktp;
94
95 __nolibc_timespec_user_to_kernel(tp, &ktp);
96 return my_syscall2(__NR_clock_settime64, clockid, &ktp);
97#endif
98}
99
100static __attribute__((unused))
101int clock_settime(clockid_t clockid, struct timespec *tp)
102{
103 return __sysret(sys_clock_settime(clockid, tp));
104}
105
106static __attribute__((unused))
107int sys_clock_nanosleep(clockid_t clockid, int flags, const struct timespec *rqtp,
108 struct timespec *rmtp)
109{
110#if defined(__NR_clock_nanosleep)
111 return my_syscall4(__NR_clock_nanosleep, clockid, flags, rqtp, rmtp);
112#else
113 struct __kernel_timespec krqtp, krmtp;
114 int ret;
115
116 __nolibc_timespec_user_to_kernel(rqtp, &krqtp);
117 ret = my_syscall4(__NR_clock_nanosleep_time64, clockid, flags, &krqtp, &krmtp);
118 if (rmtp)
119 __nolibc_timespec_kernel_to_user(&krmtp, rmtp);
120 return ret;
121#endif
122}
123
124static __attribute__((unused))
125int clock_nanosleep(clockid_t clockid, int flags, const struct timespec *rqtp,
126 struct timespec *rmtp)
127{
128 /* Directly return a positive error number */
129 return -sys_clock_nanosleep(clockid, flags, rqtp, rmtp);
130}
131
132static __inline__
133double difftime(time_t time1, time_t time2)
134{
135 return time1 - time2;
136}
137
138static __inline__
139int nanosleep(const struct timespec *rqtp, struct timespec *rmtp)
140{
141 return __sysret(sys_clock_nanosleep(CLOCK_REALTIME, 0, rqtp, rmtp));
142}
143
144
145static __attribute__((unused))
146time_t time(time_t *tptr)
147{
148 struct timeval tv;
149
150 /* note, cannot fail here */
151 sys_gettimeofday(&tv, NULL);
152
153 if (tptr)
154 *tptr = tv.tv_sec;
155 return tv.tv_sec;
156}
157
158
159/*
160 * int timer_create(clockid_t clockid, struct sigevent *evp, timer_t *timerid);
161 * int timer_gettime(timer_t timerid, struct itimerspec *curr_value);
162 * int timer_settime(timer_t timerid, int flags, const struct itimerspec *new_value, struct itimerspec *old_value);
163 */
164
165static __attribute__((unused))
166int sys_timer_create(clockid_t clockid, struct sigevent *evp, timer_t *timerid)
167{
168 return my_syscall3(__NR_timer_create, clockid, evp, timerid);
169}
170
171static __attribute__((unused))
172int timer_create(clockid_t clockid, struct sigevent *evp, timer_t *timerid)
173{
174 return __sysret(sys_timer_create(clockid, evp, timerid));
175}
176
177static __attribute__((unused))
178int sys_timer_delete(timer_t timerid)
179{
180 return my_syscall1(__NR_timer_delete, timerid);
181}
182
183static __attribute__((unused))
184int timer_delete(timer_t timerid)
185{
186 return __sysret(sys_timer_delete(timerid));
187}
188
189static __attribute__((unused))
190int sys_timer_gettime(timer_t timerid, struct itimerspec *curr_value)
191{
192#if defined(__NR_timer_gettime)
193 return my_syscall2(__NR_timer_gettime, timerid, curr_value);
194#else
195 struct __kernel_itimerspec kcurr_value;
196 int ret;
197
198 ret = my_syscall2(__NR_timer_gettime64, timerid, &kcurr_value);
199 __nolibc_timespec_kernel_to_user(&kcurr_value.it_interval, &curr_value->it_interval);
200 __nolibc_timespec_kernel_to_user(&kcurr_value.it_value, &curr_value->it_value);
201 return ret;
202#endif
203}
204
205static __attribute__((unused))
206int timer_gettime(timer_t timerid, struct itimerspec *curr_value)
207{
208 return __sysret(sys_timer_gettime(timerid, curr_value));
209}
210
211static __attribute__((unused))
212int sys_timer_settime(timer_t timerid, int flags,
213 const struct itimerspec *new_value, struct itimerspec *old_value)
214{
215#if defined(__NR_timer_settime)
216 return my_syscall4(__NR_timer_settime, timerid, flags, new_value, old_value);
217#else
218 struct __kernel_itimerspec knew_value, kold_value;
219 int ret;
220
221 __nolibc_timespec_user_to_kernel(&new_value->it_value, &knew_value.it_value);
222 __nolibc_timespec_user_to_kernel(&new_value->it_interval, &knew_value.it_interval);
223 ret = my_syscall4(__NR_timer_settime64, timerid, flags, &knew_value, &kold_value);
224 if (old_value) {
225 __nolibc_timespec_kernel_to_user(&kold_value.it_interval, &old_value->it_interval);
226 __nolibc_timespec_kernel_to_user(&kold_value.it_value, &old_value->it_value);
227 }
228 return ret;
229#endif
230}
231
232static __attribute__((unused))
233int timer_settime(timer_t timerid, int flags,
234 const struct itimerspec *new_value, struct itimerspec *old_value)
235{
236 return __sysret(sys_timer_settime(timerid, flags, new_value, old_value));
237}
238
239#endif /* _NOLIBC_TIME_H */