time.h

  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 */