| 1 | |
| 2 | |
| 3 | * Copyright (C) 1991, 1992 Linus Torvalds
|
| 4 | *
|
| 5 | * This file contains the interface functions for the various time related
|
| 6 | * system calls: time, stime, gettimeofday, settimeofday, adjtime
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| 7 | *
|
| 8 | * Modification history:
|
| 9 | *
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| 10 | * 1993-09-02 Philip Gladstone
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| 11 | * Created file with time related functions from sched/core.c and adjtimex()
|
| 12 | * 1993-10-08 Torsten Duwe
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| 13 | * adjtime interface update and CMOS clock write code
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| 14 | * 1995-08-13 Torsten Duwe
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| 15 | * kernel PLL updated to 1994-12-13 specs (rfc-1589)
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| 16 | * 1999-01-16 Ulrich Windl
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| 17 | * Introduced error checking for many cases in adjtimex().
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| 18 | * Updated NTP code according to technical memorandum Jan '96
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| 19 | * "A Kernel Model for Precision Timekeeping" by Dave Mills
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| 20 | * Allow time_constant larger than MAXTC(6) for NTP v4 (MAXTC == 10)
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| 21 | * (Even though the technical memorandum forbids it)
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| 22 | * 2004-07-14 Christoph Lameter
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| 23 | * Added getnstimeofday to allow the posix timer functions to return
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| 24 | * with nanosecond accuracy
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| 25 |
|
| 26 |
|
| 27 | #include <linux/export.h>
|
| 28 | #include <linux/kernel.h>
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| 29 | #include <linux/timex.h>
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| 30 | #include <linux/capability.h>
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| 31 | #include <linux/timekeeper_internal.h>
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| 32 | #include <linux/errno.h>
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| 33 | #include <linux/syscalls.h>
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| 34 | #include <linux/security.h>
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| 35 | #include <linux/fs.h>
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| 36 | #include <linux/math64.h>
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| 37 | #include <linux/ptrace.h>
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| 38 |
|
| 39 | #include <linux/uaccess.h>
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| 40 | #include <linux/compat.h>
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| 41 | #include <asm/unistd.h>
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| 42 |
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| 43 | #include <generated/timeconst.h>
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| 44 | #include "timekeeping.h"
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| 45 |
|
| 46 | |
| 47 | * The timezone where the local system is located. Used as a default by some
|
| 48 | * programs who obtain this value by using gettimeofday.
|
| 49 |
|
| 50 | struct timezone sys_tz;
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| 51 |
|
| 52 | EXPORT_SYMBOL(sys_tz);
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| 53 |
|
| 54 | #ifdef __ARCH_WANT_SYS_TIME
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| 55 |
|
| 56 | |
| 57 | * sys_time() can be implemented in user-level using
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| 58 | * sys_gettimeofday(). Is this for backwards compatibility? If so,
|
| 59 | * why not move it into the appropriate arch directory (for those
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| 60 | * architectures that need it).
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| 61 |
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| 62 | SYSCALL_DEFINE1(time, __kernel_old_time_t __user *, tloc)
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| 63 | {
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| 64 | __kernel_old_time_t i = (__kernel_old_time_t)ktime_get_real_seconds();
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| 65 |
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| 66 | if (tloc) {
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| 67 | if (put_user(i,tloc))
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| 68 | return -EFAULT;
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| 69 | }
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| 70 | force_successful_syscall_return();
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| 71 | return i;
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| 72 | }
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| 73 |
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| 74 | |
| 75 | * sys_stime() can be implemented in user-level using
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| 76 | * sys_settimeofday(). Is this for backwards compatibility? If so,
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| 77 | * why not move it into the appropriate arch directory (for those
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| 78 | * architectures that need it).
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| 79 |
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| 80 |
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| 81 | SYSCALL_DEFINE1(stime, __kernel_old_time_t __user *, tptr)
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| 82 | {
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| 83 | struct timespec64 tv;
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| 84 | int err;
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| 85 |
|
| 86 | if (get_user(tv.tv_sec, tptr))
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| 87 | return -EFAULT;
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| 88 |
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| 89 | tv.tv_nsec = 0;
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| 90 |
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| 91 | err = security_settime64(&tv, NULL);
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| 92 | if (err)
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| 93 | return err;
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| 94 |
|
| 95 | do_settimeofday64(&tv);
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| 96 | return 0;
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| 97 | }
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| 98 |
|
| 99 | #endif
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| 100 |
|
| 101 | #ifdef CONFIG_COMPAT_32BIT_TIME
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| 102 | #ifdef __ARCH_WANT_SYS_TIME32
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| 103 |
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| 104 |
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| 105 | SYSCALL_DEFINE1(time32, old_time32_t __user *, tloc)
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| 106 | {
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| 107 | old_time32_t i;
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| 108 |
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| 109 | i = (old_time32_t)ktime_get_real_seconds();
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| 110 |
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| 111 | if (tloc) {
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| 112 | if (put_user(i,tloc))
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| 113 | return -EFAULT;
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| 114 | }
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| 115 | force_successful_syscall_return();
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| 116 | return i;
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| 117 | }
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| 118 |
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| 119 | SYSCALL_DEFINE1(stime32, old_time32_t __user *, tptr)
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| 120 | {
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| 121 | struct timespec64 tv;
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| 122 | int err;
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| 123 |
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| 124 | if (get_user(tv.tv_sec, tptr))
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| 125 | return -EFAULT;
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| 126 |
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| 127 | tv.tv_nsec = 0;
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| 128 |
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| 129 | err = security_settime64(&tv, NULL);
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| 130 | if (err)
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| 131 | return err;
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| 132 |
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| 133 | do_settimeofday64(&tv);
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| 134 | return 0;
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| 135 | }
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| 136 |
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| 137 | #endif
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| 138 | #endif
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| 139 |
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| 140 | SYSCALL_DEFINE2(gettimeofday, struct __kernel_old_timeval __user *, tv,
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| 141 | struct timezone __user *, tz)
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| 142 | {
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| 143 | if (likely(tv != NULL)) {
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| 144 | struct timespec64 ts;
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| 145 |
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| 146 | ktime_get_real_ts64(&ts);
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| 147 | if (put_user(ts.tv_sec, &tv->tv_sec) ||
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| 148 | put_user(ts.tv_nsec / 1000, &tv->tv_usec))
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| 149 | return -EFAULT;
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| 150 | }
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| 151 | if (unlikely(tz != NULL)) {
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| 152 | if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
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| 153 | return -EFAULT;
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| 154 | }
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| 155 | return 0;
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| 156 | }
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| 157 |
|
| 158 | |
| 159 | * In case for some reason the CMOS clock has not already been running
|
| 160 | * in UTC, but in some local time: The first time we set the timezone,
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| 161 | * we will warp the clock so that it is ticking UTC time instead of
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| 162 | * local time. Presumably, if someone is setting the timezone then we
|
| 163 | * are running in an environment where the programs understand about
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| 164 | * timezones. This should be done at boot time in the /etc/rc script,
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| 165 | * as soon as possible, so that the clock can be set right. Otherwise,
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| 166 | * various programs will get confused when the clock gets warped.
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| 167 |
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| 168 |
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| 169 | int do_sys_settimeofday64(const struct timespec64 *tv, const struct timezone *tz)
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| 170 | {
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| 171 | static int firsttime = 1;
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| 172 | int error = 0;
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| 173 |
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| 174 | if (tv && !timespec64_valid_settod(tv))
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| 175 | return -EINVAL;
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| 176 |
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| 177 | error = security_settime64(tv, tz);
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| 178 | if (error)
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| 179 | return error;
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| 180 |
|
| 181 | if (tz) {
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| 182 |
|
| 183 | if (tz->tz_minuteswest > 15*60 || tz->tz_minuteswest < -15*60)
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| 184 | return -EINVAL;
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| 185 |
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| 186 | sys_tz = *tz;
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| 187 | update_vsyscall_tz();
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| 188 | if (firsttime) {
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| 189 | firsttime = 0;
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| 190 | if (!tv)
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| 191 | timekeeping_warp_clock();
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| 192 | }
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| 193 | }
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| 194 | if (tv)
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| 195 | return do_settimeofday64(tv);
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| 196 | return 0;
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| 197 | }
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| 198 |
|
| 199 | SYSCALL_DEFINE2(settimeofday, struct __kernel_old_timeval __user *, tv,
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| 200 | struct timezone __user *, tz)
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| 201 | {
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| 202 | struct timespec64 new_ts;
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| 203 | struct timezone new_tz;
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| 204 |
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| 205 | if (tv) {
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| 206 | if (get_user(new_ts.tv_sec, &tv->tv_sec) ||
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| 207 | get_user(new_ts.tv_nsec, &tv->tv_usec))
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| 208 | return -EFAULT;
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| 209 |
|
| 210 | if (new_ts.tv_nsec > USEC_PER_SEC || new_ts.tv_nsec < 0)
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| 211 | return -EINVAL;
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| 212 |
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| 213 | new_ts.tv_nsec *= NSEC_PER_USEC;
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| 214 | }
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| 215 | if (tz) {
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| 216 | if (copy_from_user(&new_tz, tz, sizeof(*tz)))
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| 217 | return -EFAULT;
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| 218 | }
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| 219 |
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| 220 | return do_sys_settimeofday64(tv ? &new_ts : NULL, tz ? &new_tz : NULL);
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| 221 | }
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| 222 |
|
| 223 | #ifdef CONFIG_COMPAT
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| 224 | COMPAT_SYSCALL_DEFINE2(gettimeofday, struct old_timeval32 __user *, tv,
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| 225 | struct timezone __user *, tz)
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| 226 | {
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| 227 | if (tv) {
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| 228 | struct timespec64 ts;
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| 229 |
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| 230 | ktime_get_real_ts64(&ts);
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| 231 | if (put_user(ts.tv_sec, &tv->tv_sec) ||
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| 232 | put_user(ts.tv_nsec / 1000, &tv->tv_usec))
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| 233 | return -EFAULT;
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| 234 | }
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| 235 | if (tz) {
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| 236 | if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
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| 237 | return -EFAULT;
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| 238 | }
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| 239 |
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| 240 | return 0;
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| 241 | }
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| 242 |
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| 243 | COMPAT_SYSCALL_DEFINE2(settimeofday, struct old_timeval32 __user *, tv,
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| 244 | struct timezone __user *, tz)
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| 245 | {
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| 246 | struct timespec64 new_ts;
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| 247 | struct timezone new_tz;
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| 248 |
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| 249 | if (tv) {
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| 250 | if (get_user(new_ts.tv_sec, &tv->tv_sec) ||
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| 251 | get_user(new_ts.tv_nsec, &tv->tv_usec))
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| 252 | return -EFAULT;
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| 253 |
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| 254 | if (new_ts.tv_nsec > USEC_PER_SEC || new_ts.tv_nsec < 0)
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| 255 | return -EINVAL;
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| 256 |
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| 257 | new_ts.tv_nsec *= NSEC_PER_USEC;
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| 258 | }
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| 259 | if (tz) {
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| 260 | if (copy_from_user(&new_tz, tz, sizeof(*tz)))
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| 261 | return -EFAULT;
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| 262 | }
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| 263 |
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| 264 | return do_sys_settimeofday64(tv ? &new_ts : NULL, tz ? &new_tz : NULL);
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| 265 | }
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| 266 | #endif
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| 267 |
|
| 268 | #ifdef CONFIG_64BIT
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| 269 | SYSCALL_DEFINE1(adjtimex, struct __kernel_timex __user *, txc_p)
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| 270 | {
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| 271 | struct __kernel_timex txc;
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| 272 | int ret;
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| 273 |
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| 274 | |
| 275 | * structure. But bear in mind that the structures
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| 276 | * may change
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| 277 |
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| 278 | if (copy_from_user(&txc, txc_p, sizeof(struct __kernel_timex)))
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| 279 | return -EFAULT;
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| 280 | ret = do_adjtimex(&txc);
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| 281 | return copy_to_user(txc_p, &txc, sizeof(struct __kernel_timex)) ? -EFAULT : ret;
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| 282 | }
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| 283 | #endif
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| 284 |
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| 285 | #ifdef CONFIG_COMPAT_32BIT_TIME
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| 286 | int get_old_timex32(struct __kernel_timex *txc, const struct old_timex32 __user *utp)
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| 287 | {
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| 288 | struct old_timex32 tx32;
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| 289 |
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| 290 | memset(txc, 0, sizeof(struct __kernel_timex));
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| 291 | if (copy_from_user(&tx32, utp, sizeof(struct old_timex32)))
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| 292 | return -EFAULT;
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| 293 |
|
| 294 | txc->modes = tx32.modes;
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| 295 | txc->offset = tx32.offset;
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| 296 | txc->freq = tx32.freq;
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| 297 | txc->maxerror = tx32.maxerror;
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| 298 | txc->esterror = tx32.esterror;
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| 299 | txc->status = tx32.status;
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| 300 | txc->constant = tx32.constant;
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| 301 | txc->precision = tx32.precision;
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| 302 | txc->tolerance = tx32.tolerance;
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| 303 | txc->time.tv_sec = tx32.time.tv_sec;
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| 304 | txc->time.tv_usec = tx32.time.tv_usec;
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| 305 | txc->tick = tx32.tick;
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| 306 | txc->ppsfreq = tx32.ppsfreq;
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| 307 | txc->jitter = tx32.jitter;
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| 308 | txc->shift = tx32.shift;
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| 309 | txc->stabil = tx32.stabil;
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| 310 | txc->jitcnt = tx32.jitcnt;
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| 311 | txc->calcnt = tx32.calcnt;
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| 312 | txc->errcnt = tx32.errcnt;
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| 313 | txc->stbcnt = tx32.stbcnt;
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| 314 |
|
| 315 | return 0;
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| 316 | }
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| 317 |
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| 318 | int put_old_timex32(struct old_timex32 __user *utp, const struct __kernel_timex *txc)
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| 319 | {
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| 320 | struct old_timex32 tx32;
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| 321 |
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| 322 | memset(&tx32, 0, sizeof(struct old_timex32));
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| 323 | tx32.modes = txc->modes;
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| 324 | tx32.offset = txc->offset;
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| 325 | tx32.freq = txc->freq;
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| 326 | tx32.maxerror = txc->maxerror;
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| 327 | tx32.esterror = txc->esterror;
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| 328 | tx32.status = txc->status;
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| 329 | tx32.constant = txc->constant;
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| 330 | tx32.precision = txc->precision;
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| 331 | tx32.tolerance = txc->tolerance;
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| 332 | tx32.time.tv_sec = txc->time.tv_sec;
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| 333 | tx32.time.tv_usec = txc->time.tv_usec;
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| 334 | tx32.tick = txc->tick;
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| 335 | tx32.ppsfreq = txc->ppsfreq;
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| 336 | tx32.jitter = txc->jitter;
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| 337 | tx32.shift = txc->shift;
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| 338 | tx32.stabil = txc->stabil;
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| 339 | tx32.jitcnt = txc->jitcnt;
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| 340 | tx32.calcnt = txc->calcnt;
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| 341 | tx32.errcnt = txc->errcnt;
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| 342 | tx32.stbcnt = txc->stbcnt;
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| 343 | tx32.tai = txc->tai;
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| 344 | if (copy_to_user(utp, &tx32, sizeof(struct old_timex32)))
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| 345 | return -EFAULT;
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| 346 | return 0;
|
| 347 | }
|
| 348 |
|
| 349 | SYSCALL_DEFINE1(adjtimex_time32, struct old_timex32 __user *, utp)
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| 350 | {
|
| 351 | struct __kernel_timex txc;
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| 352 | int err, ret;
|
| 353 |
|
| 354 | err = get_old_timex32(&txc, utp);
|
| 355 | if (err)
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| 356 | return err;
|
| 357 |
|
| 358 | ret = do_adjtimex(&txc);
|
| 359 |
|
| 360 | err = put_old_timex32(utp, &txc);
|
| 361 | if (err)
|
| 362 | return err;
|
| 363 |
|
| 364 | return ret;
|
| 365 | }
|
| 366 | #endif
|
| 367 |
|
| 368 | #if HZ > MSEC_PER_SEC || (MSEC_PER_SEC % HZ)
|
| 369 | |
| 370 | * jiffies_to_msecs - Convert jiffies to milliseconds
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| 371 | * @j: jiffies value
|
| 372 | *
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| 373 | * Return: milliseconds value
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| 374 |
|
| 375 | unsigned int jiffies_to_msecs(const unsigned long j)
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| 376 | {
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| 377 | #if HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC)
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| 378 | return (j + (HZ / MSEC_PER_SEC) - 1)/(HZ / MSEC_PER_SEC);
|
| 379 | #else
|
| 380 | # if BITS_PER_LONG == 32
|
| 381 | return (HZ_TO_MSEC_MUL32 * j + (1ULL << HZ_TO_MSEC_SHR32) - 1) >>
|
| 382 | HZ_TO_MSEC_SHR32;
|
| 383 | # else
|
| 384 | return DIV_ROUND_UP(j * HZ_TO_MSEC_NUM, HZ_TO_MSEC_DEN);
|
| 385 | # endif
|
| 386 | #endif
|
| 387 | }
|
| 388 | EXPORT_SYMBOL(jiffies_to_msecs);
|
| 389 | #endif
|
| 390 |
|
| 391 | #if (USEC_PER_SEC % HZ)
|
| 392 | |
| 393 | * jiffies_to_usecs - Convert jiffies to microseconds
|
| 394 | * @j: jiffies value
|
| 395 | *
|
| 396 | * Return: microseconds value
|
| 397 |
|
| 398 | unsigned int jiffies_to_usecs(const unsigned long j)
|
| 399 | {
|
| 400 | |
| 401 | * Hz usually doesn't go much further MSEC_PER_SEC.
|
| 402 | * jiffies_to_usecs() and usecs_to_jiffies() depend on that.
|
| 403 |
|
| 404 | BUILD_BUG_ON(HZ > USEC_PER_SEC);
|
| 405 |
|
| 406 | #if BITS_PER_LONG == 32
|
| 407 | return (HZ_TO_USEC_MUL32 * j) >> HZ_TO_USEC_SHR32;
|
| 408 | #else
|
| 409 | return (j * HZ_TO_USEC_NUM) / HZ_TO_USEC_DEN;
|
| 410 | #endif
|
| 411 | }
|
| 412 | EXPORT_SYMBOL(jiffies_to_usecs);
|
| 413 | #endif
|
| 414 |
|
| 415 | |
| 416 | * mktime64 - Converts date to seconds.
|
| 417 | * @year0: year to convert
|
| 418 | * @mon0: month to convert
|
| 419 | * @day: day to convert
|
| 420 | * @hour: hour to convert
|
| 421 | * @min: minute to convert
|
| 422 | * @sec: second to convert
|
| 423 | *
|
| 424 | * Converts Gregorian date to seconds since 1970-01-01 00:00:00.
|
| 425 | * Assumes input in normal date format, i.e. 1980-12-31 23:59:59
|
| 426 | * => year=1980, mon=12, day=31, hour=23, min=59, sec=59.
|
| 427 | *
|
| 428 | * [For the Julian calendar (which was used in Russia before 1917,
|
| 429 | * Britain & colonies before 1752, anywhere else before 1582,
|
| 430 | * and is still in use by some communities) leave out the
|
| 431 | * -year/100+year/400 terms, and add 10.]
|
| 432 | *
|
| 433 | * This algorithm was first published by Gauss (I think).
|
| 434 | *
|
| 435 | * A leap second can be indicated by calling this function with sec as
|
| 436 | * 60 (allowable under ISO 8601). The leap second is treated the same
|
| 437 | * as the following second since they don't exist in UNIX time.
|
| 438 | *
|
| 439 | * An encoding of midnight at the end of the day as 24:00:00 - ie. midnight
|
| 440 | * tomorrow - (allowable under ISO 8601) is supported.
|
| 441 | *
|
| 442 | * Return: seconds since the epoch time for the given input date
|
| 443 |
|
| 444 | time64_t mktime64(const unsigned int year0, const unsigned int mon0,
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| 445 | const unsigned int day, const unsigned int hour,
|
| 446 | const unsigned int min, const unsigned int sec)
|
| 447 | {
|
| 448 | unsigned int mon = mon0, year = year0;
|
| 449 |
|
| 450 |
|
| 451 | if (0 >= (int) (mon -= 2)) {
|
| 452 | mon += 12;
|
| 453 | year -= 1;
|
| 454 | }
|
| 455 |
|
| 456 | return ((((time64_t)
|
| 457 | (year/4 - year/100 + year/400 + 367*mon/12 + day) +
|
| 458 | year*365 - 719499
|
| 459 | )*24 + hour
|
| 460 | )*60 + min
|
| 461 | )*60 + sec;
|
| 462 | }
|
| 463 | EXPORT_SYMBOL(mktime64);
|
| 464 |
|
| 465 | struct __kernel_old_timeval ns_to_kernel_old_timeval(s64 nsec)
|
| 466 | {
|
| 467 | struct timespec64 ts = ns_to_timespec64(nsec);
|
| 468 | struct __kernel_old_timeval tv;
|
| 469 |
|
| 470 | tv.tv_sec = ts.tv_sec;
|
| 471 | tv.tv_usec = (suseconds_t)ts.tv_nsec / 1000;
|
| 472 |
|
| 473 | return tv;
|
| 474 | }
|
| 475 | EXPORT_SYMBOL(ns_to_kernel_old_timeval);
|
| 476 |
|
| 477 | |
| 478 | * set_normalized_timespec64 - set timespec sec and nsec parts and normalize
|
| 479 | *
|
| 480 | * @ts: pointer to timespec variable to be set
|
| 481 | * @sec: seconds to set
|
| 482 | * @nsec: nanoseconds to set
|
| 483 | *
|
| 484 | * Set seconds and nanoseconds field of a timespec variable and
|
| 485 | * normalize to the timespec storage format
|
| 486 | *
|
| 487 | * Note: The tv_nsec part is always in the range of 0 <= tv_nsec < NSEC_PER_SEC.
|
| 488 | * For negative values only the tv_sec field is negative !
|
| 489 |
|
| 490 | void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec)
|
| 491 | {
|
| 492 | while (nsec >= NSEC_PER_SEC) {
|
| 493 | |
| 494 | * The following asm() prevents the compiler from
|
| 495 | * optimising this loop into a modulo operation. See
|
| 496 | * also __iter_div_u64_rem() in include/linux/time.h
|
| 497 |
|
| 498 | asm("" : "+rm"(nsec));
|
| 499 | nsec -= NSEC_PER_SEC;
|
| 500 | ++sec;
|
| 501 | }
|
| 502 | while (nsec < 0) {
|
| 503 | asm("" : "+rm"(nsec));
|
| 504 | nsec += NSEC_PER_SEC;
|
| 505 | --sec;
|
| 506 | }
|
| 507 | ts->tv_sec = sec;
|
| 508 | ts->tv_nsec = nsec;
|
| 509 | }
|
| 510 | EXPORT_SYMBOL(set_normalized_timespec64);
|
| 511 |
|
| 512 | |
| 513 | * ns_to_timespec64 - Convert nanoseconds to timespec64
|
| 514 | * @nsec: the nanoseconds value to be converted
|
| 515 | *
|
| 516 | * Return: the timespec64 representation of the nsec parameter.
|
| 517 |
|
| 518 | struct timespec64 ns_to_timespec64(s64 nsec)
|
| 519 | {
|
| 520 | struct timespec64 ts = { 0, 0 };
|
| 521 | s32 rem;
|
| 522 |
|
| 523 | if (likely(nsec > 0)) {
|
| 524 | ts.tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
|
| 525 | ts.tv_nsec = rem;
|
| 526 | } else if (nsec < 0) {
|
| 527 | |
| 528 | * With negative times, tv_sec points to the earlier
|
| 529 | * second, and tv_nsec counts the nanoseconds since
|
| 530 | * then, so tv_nsec is always a positive number.
|
| 531 |
|
| 532 | ts.tv_sec = -div_u64_rem(-nsec - 1, NSEC_PER_SEC, &rem) - 1;
|
| 533 | ts.tv_nsec = NSEC_PER_SEC - rem - 1;
|
| 534 | }
|
| 535 |
|
| 536 | return ts;
|
| 537 | }
|
| 538 | EXPORT_SYMBOL(ns_to_timespec64);
|
| 539 |
|
| 540 | |
| 541 | * __msecs_to_jiffies: - convert milliseconds to jiffies
|
| 542 | * @m: time in milliseconds
|
| 543 | *
|
| 544 | * conversion is done as follows:
|
| 545 | *
|
| 546 | * - negative values mean 'infinite timeout' (MAX_JIFFY_OFFSET)
|
| 547 | *
|
| 548 | * - 'too large' values [that would result in larger than
|
| 549 | * MAX_JIFFY_OFFSET values] mean 'infinite timeout' too.
|
| 550 | *
|
| 551 | * - all other values are converted to jiffies by either multiplying
|
| 552 | * the input value by a factor or dividing it with a factor and
|
| 553 | * handling any 32-bit overflows.
|
| 554 | * for the details see _msecs_to_jiffies()
|
| 555 | *
|
| 556 | * msecs_to_jiffies() checks for the passed in value being a constant
|
| 557 | * via __builtin_constant_p() allowing gcc to eliminate most of the
|
| 558 | * code, __msecs_to_jiffies() is called if the value passed does not
|
| 559 | * allow constant folding and the actual conversion must be done at
|
| 560 | * runtime.
|
| 561 | * The _msecs_to_jiffies helpers are the HZ dependent conversion
|
| 562 | * routines found in include/linux/jiffies.h
|
| 563 | *
|
| 564 | * Return: jiffies value
|
| 565 |
|
| 566 | unsigned long __msecs_to_jiffies(const unsigned int m)
|
| 567 | {
|
| 568 | |
| 569 | * Negative value, means infinite timeout:
|
| 570 |
|
| 571 | if ((int)m < 0)
|
| 572 | return MAX_JIFFY_OFFSET;
|
| 573 | return _msecs_to_jiffies(m);
|
| 574 | }
|
| 575 | EXPORT_SYMBOL(__msecs_to_jiffies);
|
| 576 |
|
| 577 | |
| 578 | * __usecs_to_jiffies: - convert microseconds to jiffies
|
| 579 | * @u: time in milliseconds
|
| 580 | *
|
| 581 | * Return: jiffies value
|
| 582 |
|
| 583 | unsigned long __usecs_to_jiffies(const unsigned int u)
|
| 584 | {
|
| 585 | if (u > jiffies_to_usecs(MAX_JIFFY_OFFSET))
|
| 586 | return MAX_JIFFY_OFFSET;
|
| 587 | return _usecs_to_jiffies(u);
|
| 588 | }
|
| 589 | EXPORT_SYMBOL(__usecs_to_jiffies);
|
| 590 |
|
| 591 | |
| 592 | * timespec64_to_jiffies - convert a timespec64 value to jiffies
|
| 593 | * @value: pointer to &struct timespec64
|
| 594 | *
|
| 595 | * The TICK_NSEC - 1 rounds up the value to the next resolution. Note
|
| 596 | * that a remainder subtract here would not do the right thing as the
|
| 597 | * resolution values don't fall on second boundaries. I.e. the line:
|
| 598 | * nsec -= nsec % TICK_NSEC; is NOT a correct resolution rounding.
|
| 599 | * Note that due to the small error in the multiplier here, this
|
| 600 | * rounding is incorrect for sufficiently large values of tv_nsec, but
|
| 601 | * well formed timespecs should have tv_nsec < NSEC_PER_SEC, so we're
|
| 602 | * OK.
|
| 603 | *
|
| 604 | * Rather, we just shift the bits off the right.
|
| 605 | *
|
| 606 | * The >> (NSEC_JIFFIE_SC - SEC_JIFFIE_SC) converts the scaled nsec
|
| 607 | * value to a scaled second value.
|
| 608 | *
|
| 609 | * Return: jiffies value
|
| 610 |
|
| 611 | unsigned long
|
| 612 | timespec64_to_jiffies(const struct timespec64 *value)
|
| 613 | {
|
| 614 | u64 sec = value->tv_sec;
|
| 615 | long nsec = value->tv_nsec + TICK_NSEC - 1;
|
| 616 |
|
| 617 | if (sec >= MAX_SEC_IN_JIFFIES){
|
| 618 | sec = MAX_SEC_IN_JIFFIES;
|
| 619 | nsec = 0;
|
| 620 | }
|
| 621 | return ((sec * SEC_CONVERSION) +
|
| 622 | (((u64)nsec * NSEC_CONVERSION) >>
|
| 623 | (NSEC_JIFFIE_SC - SEC_JIFFIE_SC))) >> SEC_JIFFIE_SC;
|
| 624 |
|
| 625 | }
|
| 626 | EXPORT_SYMBOL(timespec64_to_jiffies);
|
| 627 |
|
| 628 | |
| 629 | * jiffies_to_timespec64 - convert jiffies value to &struct timespec64
|
| 630 | * @jiffies: jiffies value
|
| 631 | * @value: pointer to &struct timespec64
|
| 632 |
|
| 633 | void
|
| 634 | jiffies_to_timespec64(const unsigned long jiffies, struct timespec64 *value)
|
| 635 | {
|
| 636 | |
| 637 | * Convert jiffies to nanoseconds and separate with
|
| 638 | * one divide.
|
| 639 |
|
| 640 | u32 rem;
|
| 641 | value->tv_sec = div_u64_rem((u64)jiffies * TICK_NSEC,
|
| 642 | NSEC_PER_SEC, &rem);
|
| 643 | value->tv_nsec = rem;
|
| 644 | }
|
| 645 | EXPORT_SYMBOL(jiffies_to_timespec64);
|
| 646 |
|
| 647 | |
| 648 | * Convert jiffies/jiffies_64 to clock_t and back.
|
| 649 |
|
| 650 |
|
| 651 | |
| 652 | * jiffies_to_clock_t - Convert jiffies to clock_t
|
| 653 | * @x: jiffies value
|
| 654 | *
|
| 655 | * Return: jiffies converted to clock_t (CLOCKS_PER_SEC)
|
| 656 |
|
| 657 | clock_t jiffies_to_clock_t(unsigned long x)
|
| 658 | {
|
| 659 | #if (TICK_NSEC % (NSEC_PER_SEC / USER_HZ)) == 0
|
| 660 | # if HZ < USER_HZ
|
| 661 | return x * (USER_HZ / HZ);
|
| 662 | # else
|
| 663 | return x / (HZ / USER_HZ);
|
| 664 | # endif
|
| 665 | #else
|
| 666 | return div_u64((u64)x * TICK_NSEC, NSEC_PER_SEC / USER_HZ);
|
| 667 | #endif
|
| 668 | }
|
| 669 | EXPORT_SYMBOL(jiffies_to_clock_t);
|
| 670 |
|
| 671 | |
| 672 | * clock_t_to_jiffies - Convert clock_t to jiffies
|
| 673 | * @x: clock_t value
|
| 674 | *
|
| 675 | * Return: clock_t value converted to jiffies
|
| 676 |
|
| 677 | unsigned long clock_t_to_jiffies(unsigned long x)
|
| 678 | {
|
| 679 | #if (HZ % USER_HZ)==0
|
| 680 | if (x >= ~0UL / (HZ / USER_HZ))
|
| 681 | return ~0UL;
|
| 682 | return x * (HZ / USER_HZ);
|
| 683 | #else
|
| 684 |
|
| 685 | if (x >= ~0UL / HZ * USER_HZ)
|
| 686 | return ~0UL;
|
| 687 |
|
| 688 |
|
| 689 | return div_u64((u64)x * HZ, USER_HZ);
|
| 690 | #endif
|
| 691 | }
|
| 692 | EXPORT_SYMBOL(clock_t_to_jiffies);
|
| 693 |
|
| 694 | |
| 695 | * jiffies_64_to_clock_t - Convert jiffies_64 to clock_t
|
| 696 | * @x: jiffies_64 value
|
| 697 | *
|
| 698 | * Return: jiffies_64 value converted to 64-bit "clock_t" (CLOCKS_PER_SEC)
|
| 699 |
|
| 700 | notrace u64 jiffies_64_to_clock_t(u64 x)
|
| 701 | {
|
| 702 | #if (TICK_NSEC % (NSEC_PER_SEC / USER_HZ)) == 0
|
| 703 | # if HZ < USER_HZ
|
| 704 | x = div_u64(x * USER_HZ, HZ);
|
| 705 | # elif HZ > USER_HZ
|
| 706 | x = div_u64(x, HZ / USER_HZ);
|
| 707 | # else
|
| 708 |
|
| 709 | # endif
|
| 710 | #else
|
| 711 | |
| 712 | * There are better ways that don't overflow early,
|
| 713 | * but even this doesn't overflow in hundreds of years
|
| 714 | * in 64 bits, so..
|
| 715 |
|
| 716 | x = div_u64(x * TICK_NSEC, (NSEC_PER_SEC / USER_HZ));
|
| 717 | #endif
|
| 718 | return x;
|
| 719 | }
|
| 720 | EXPORT_SYMBOL(jiffies_64_to_clock_t);
|
| 721 |
|
| 722 | |
| 723 | * nsec_to_clock_t - Convert nsec value to clock_t
|
| 724 | * @x: nsec value
|
| 725 | *
|
| 726 | * Return: nsec value converted to 64-bit "clock_t" (CLOCKS_PER_SEC)
|
| 727 |
|
| 728 | u64 nsec_to_clock_t(u64 x)
|
| 729 | {
|
| 730 | #if (NSEC_PER_SEC % USER_HZ) == 0
|
| 731 | return div_u64(x, NSEC_PER_SEC / USER_HZ);
|
| 732 | #elif (USER_HZ % 512) == 0
|
| 733 | return div_u64(x * USER_HZ / 512, NSEC_PER_SEC / 512);
|
| 734 | #else
|
| 735 | |
| 736 | * max relative error 5.7e-8 (1.8s per year) for USER_HZ <= 1024,
|
| 737 | * overflow after 64.99 years.
|
| 738 | * exact for HZ=60, 72, 90, 120, 144, 180, 300, 600, 900, ...
|
| 739 |
|
| 740 | return div_u64(x * 9, (9ull * NSEC_PER_SEC + (USER_HZ / 2)) / USER_HZ);
|
| 741 | #endif
|
| 742 | }
|
| 743 |
|
| 744 | |
| 745 | * jiffies64_to_nsecs - Convert jiffies64 to nanoseconds
|
| 746 | * @j: jiffies64 value
|
| 747 | *
|
| 748 | * Return: nanoseconds value
|
| 749 |
|
| 750 | u64 jiffies64_to_nsecs(u64 j)
|
| 751 | {
|
| 752 | #if !(NSEC_PER_SEC % HZ)
|
| 753 | return (NSEC_PER_SEC / HZ) * j;
|
| 754 | # else
|
| 755 | return div_u64(j * HZ_TO_NSEC_NUM, HZ_TO_NSEC_DEN);
|
| 756 | #endif
|
| 757 | }
|
| 758 | EXPORT_SYMBOL(jiffies64_to_nsecs);
|
| 759 |
|
| 760 | |
| 761 | * jiffies64_to_msecs - Convert jiffies64 to milliseconds
|
| 762 | * @j: jiffies64 value
|
| 763 | *
|
| 764 | * Return: milliseconds value
|
| 765 |
|
| 766 | u64 jiffies64_to_msecs(const u64 j)
|
| 767 | {
|
| 768 | #if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ)
|
| 769 | return (MSEC_PER_SEC / HZ) * j;
|
| 770 | #else
|
| 771 | return div_u64(j * HZ_TO_MSEC_NUM, HZ_TO_MSEC_DEN);
|
| 772 | #endif
|
| 773 | }
|
| 774 | EXPORT_SYMBOL(jiffies64_to_msecs);
|
| 775 |
|
| 776 | |
| 777 | * nsecs_to_jiffies64 - Convert nsecs in u64 to jiffies64
|
| 778 | *
|
| 779 | * @n: nsecs in u64
|
| 780 | *
|
| 781 | * Unlike {m,u}secs_to_jiffies, type of input is not unsigned int but u64.
|
| 782 | * And this doesn't return MAX_JIFFY_OFFSET since this function is designed
|
| 783 | * for scheduler, not for use in device drivers to calculate timeout value.
|
| 784 | *
|
| 785 | * note:
|
| 786 | * NSEC_PER_SEC = 10^9 = (5^9 * 2^9) = (1953125 * 512)
|
| 787 | * ULLONG_MAX ns = 18446744073.709551615 secs = about 584 years
|
| 788 | *
|
| 789 | * Return: nsecs converted to jiffies64 value
|
| 790 |
|
| 791 | u64 nsecs_to_jiffies64(u64 n)
|
| 792 | {
|
| 793 | #if (NSEC_PER_SEC % HZ) == 0
|
| 794 |
|
| 795 | return div_u64(n, NSEC_PER_SEC / HZ);
|
| 796 | #elif (HZ % 512) == 0
|
| 797 |
|
| 798 | return div_u64(n * HZ / 512, NSEC_PER_SEC / 512);
|
| 799 | #else
|
| 800 | |
| 801 | * Generic case - optimized for cases where HZ is a multiple of 3.
|
| 802 | * overflow after 64.99 years, exact for HZ = 60, 72, 90, 120 etc.
|
| 803 |
|
| 804 | return div_u64(n * 9, (9ull * NSEC_PER_SEC + HZ / 2) / HZ);
|
| 805 | #endif
|
| 806 | }
|
| 807 | EXPORT_SYMBOL(nsecs_to_jiffies64);
|
| 808 |
|
| 809 | |
| 810 | * nsecs_to_jiffies - Convert nsecs in u64 to jiffies
|
| 811 | *
|
| 812 | * @n: nsecs in u64
|
| 813 | *
|
| 814 | * Unlike {m,u}secs_to_jiffies, type of input is not unsigned int but u64.
|
| 815 | * And this doesn't return MAX_JIFFY_OFFSET since this function is designed
|
| 816 | * for scheduler, not for use in device drivers to calculate timeout value.
|
| 817 | *
|
| 818 | * note:
|
| 819 | * NSEC_PER_SEC = 10^9 = (5^9 * 2^9) = (1953125 * 512)
|
| 820 | * ULLONG_MAX ns = 18446744073.709551615 secs = about 584 years
|
| 821 | *
|
| 822 | * Return: nsecs converted to jiffies value
|
| 823 |
|
| 824 | unsigned long nsecs_to_jiffies(u64 n)
|
| 825 | {
|
| 826 | return (unsigned long)nsecs_to_jiffies64(n);
|
| 827 | }
|
| 828 | EXPORT_SYMBOL_GPL(nsecs_to_jiffies);
|
| 829 |
|
| 830 | |
| 831 | * timespec64_add_safe - Add two timespec64 values and do a safety check
|
| 832 | * for overflow.
|
| 833 | * @lhs: first (left) timespec64 to add
|
| 834 | * @rhs: second (right) timespec64 to add
|
| 835 | *
|
| 836 | * It's assumed that both values are valid (>= 0).
|
| 837 | * And, each timespec64 is in normalized form.
|
| 838 | *
|
| 839 | * Return: sum of @lhs + @rhs
|
| 840 |
|
| 841 | struct timespec64 timespec64_add_safe(const struct timespec64 lhs,
|
| 842 | const struct timespec64 rhs)
|
| 843 | {
|
| 844 | struct timespec64 res;
|
| 845 |
|
| 846 | set_normalized_timespec64(&res, (timeu64_t) lhs.tv_sec + rhs.tv_sec,
|
| 847 | lhs.tv_nsec + rhs.tv_nsec);
|
| 848 |
|
| 849 | if (unlikely(res.tv_sec < lhs.tv_sec || res.tv_sec < rhs.tv_sec)) {
|
| 850 | res.tv_sec = TIME64_MAX;
|
| 851 | res.tv_nsec = 0;
|
| 852 | }
|
| 853 |
|
| 854 | return res;
|
| 855 | }
|
| 856 | EXPORT_SYMBOL_GPL(timespec64_add_safe);
|
| 857 |
|
| 858 | |
| 859 | * get_timespec64 - get user's time value into kernel space
|
| 860 | * @ts: destination &struct timespec64
|
| 861 | * @uts: user's time value as &struct __kernel_timespec
|
| 862 | *
|
| 863 | * Handles compat or 32-bit modes.
|
| 864 | *
|
| 865 | * Return: 0 on success or negative errno on error
|
| 866 |
|
| 867 | int get_timespec64(struct timespec64 *ts,
|
| 868 | const struct __kernel_timespec __user *uts)
|
| 869 | {
|
| 870 | struct __kernel_timespec kts;
|
| 871 | int ret;
|
| 872 |
|
| 873 | ret = copy_from_user(&kts, uts, sizeof(kts));
|
| 874 | if (ret)
|
| 875 | return -EFAULT;
|
| 876 |
|
| 877 | ts->tv_sec = kts.tv_sec;
|
| 878 |
|
| 879 |
|
| 880 | if (in_compat_syscall())
|
| 881 | kts.tv_nsec &= 0xFFFFFFFFUL;
|
| 882 |
|
| 883 |
|
| 884 | ts->tv_nsec = kts.tv_nsec;
|
| 885 |
|
| 886 | return 0;
|
| 887 | }
|
| 888 | EXPORT_SYMBOL_GPL(get_timespec64);
|
| 889 |
|
| 890 | |
| 891 | * put_timespec64 - convert timespec64 value to __kernel_timespec format and
|
| 892 | * copy the latter to userspace
|
| 893 | * @ts: input &struct timespec64
|
| 894 | * @uts: user's &struct __kernel_timespec
|
| 895 | *
|
| 896 | * Return: 0 on success or negative errno on error
|
| 897 |
|
| 898 | int put_timespec64(const struct timespec64 *ts,
|
| 899 | struct __kernel_timespec __user *uts)
|
| 900 | {
|
| 901 | struct __kernel_timespec kts = {
|
| 902 | .tv_sec = ts->tv_sec,
|
| 903 | .tv_nsec = ts->tv_nsec
|
| 904 | };
|
| 905 |
|
| 906 | return copy_to_user(uts, &kts, sizeof(kts)) ? -EFAULT : 0;
|
| 907 | }
|
| 908 | EXPORT_SYMBOL_GPL(put_timespec64);
|
| 909 |
|
| 910 | static int __get_old_timespec32(struct timespec64 *ts64,
|
| 911 | const struct old_timespec32 __user *cts)
|
| 912 | {
|
| 913 | struct old_timespec32 ts;
|
| 914 | int ret;
|
| 915 |
|
| 916 | ret = copy_from_user(&ts, cts, sizeof(ts));
|
| 917 | if (ret)
|
| 918 | return -EFAULT;
|
| 919 |
|
| 920 | ts64->tv_sec = ts.tv_sec;
|
| 921 | ts64->tv_nsec = ts.tv_nsec;
|
| 922 |
|
| 923 | return 0;
|
| 924 | }
|
| 925 |
|
| 926 | static int __put_old_timespec32(const struct timespec64 *ts64,
|
| 927 | struct old_timespec32 __user *cts)
|
| 928 | {
|
| 929 | struct old_timespec32 ts = {
|
| 930 | .tv_sec = ts64->tv_sec,
|
| 931 | .tv_nsec = ts64->tv_nsec
|
| 932 | };
|
| 933 | return copy_to_user(cts, &ts, sizeof(ts)) ? -EFAULT : 0;
|
| 934 | }
|
| 935 |
|
| 936 | |
| 937 | * get_old_timespec32 - get user's old-format time value into kernel space
|
| 938 | * @ts: destination &struct timespec64
|
| 939 | * @uts: user's old-format time value (&struct old_timespec32)
|
| 940 | *
|
| 941 | * Handles X86_X32_ABI compatibility conversion.
|
| 942 | *
|
| 943 | * Return: 0 on success or negative errno on error
|
| 944 |
|
| 945 | int get_old_timespec32(struct timespec64 *ts, const void __user *uts)
|
| 946 | {
|
| 947 | if (COMPAT_USE_64BIT_TIME)
|
| 948 | return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
|
| 949 | else
|
| 950 | return __get_old_timespec32(ts, uts);
|
| 951 | }
|
| 952 | EXPORT_SYMBOL_GPL(get_old_timespec32);
|
| 953 |
|
| 954 | |
| 955 | * put_old_timespec32 - convert timespec64 value to &struct old_timespec32 and
|
| 956 | * copy the latter to userspace
|
| 957 | * @ts: input &struct timespec64
|
| 958 | * @uts: user's &struct old_timespec32
|
| 959 | *
|
| 960 | * Handles X86_X32_ABI compatibility conversion.
|
| 961 | *
|
| 962 | * Return: 0 on success or negative errno on error
|
| 963 |
|
| 964 | int put_old_timespec32(const struct timespec64 *ts, void __user *uts)
|
| 965 | {
|
| 966 | if (COMPAT_USE_64BIT_TIME)
|
| 967 | return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
|
| 968 | else
|
| 969 | return __put_old_timespec32(ts, uts);
|
| 970 | }
|
| 971 | EXPORT_SYMBOL_GPL(put_old_timespec32);
|
| 972 |
|
| 973 | |
| 974 | * get_itimerspec64 - get user's &struct __kernel_itimerspec into kernel space
|
| 975 | * @it: destination &struct itimerspec64
|
| 976 | * @uit: user's &struct __kernel_itimerspec
|
| 977 | *
|
| 978 | * Return: 0 on success or negative errno on error
|
| 979 |
|
| 980 | int get_itimerspec64(struct itimerspec64 *it,
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| 981 | const struct __kernel_itimerspec __user *uit)
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| 982 | {
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| 983 | int ret;
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| 984 |
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| 985 | ret = get_timespec64(&it->it_interval, &uit->it_interval);
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| 986 | if (ret)
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| 987 | return ret;
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| 988 |
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| 989 | ret = get_timespec64(&it->it_value, &uit->it_value);
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| 990 |
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| 991 | return ret;
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| 992 | }
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| 993 | EXPORT_SYMBOL_GPL(get_itimerspec64);
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| 994 |
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| 995 | |
| 996 | * put_itimerspec64 - convert &struct itimerspec64 to __kernel_itimerspec format
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| 997 | * and copy the latter to userspace
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| 998 | * @it: input &struct itimerspec64
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| 999 | * @uit: user's &struct __kernel_itimerspec
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| 1000 | *
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| 1001 | * Return: 0 on success or negative errno on error
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| 1002 |
|
| 1003 | int put_itimerspec64(const struct itimerspec64 *it,
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| 1004 | struct __kernel_itimerspec __user *uit)
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| 1005 | {
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| 1006 | int ret;
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| 1007 |
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| 1008 | ret = put_timespec64(&it->it_interval, &uit->it_interval);
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| 1009 | if (ret)
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| 1010 | return ret;
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| 1011 |
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| 1012 | ret = put_timespec64(&it->it_value, &uit->it_value);
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| 1013 |
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| 1014 | return ret;
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| 1015 | }
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| 1016 | EXPORT_SYMBOL_GPL(put_itimerspec64);
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| 1017 |
|
| 1018 | |
| 1019 | * get_old_itimerspec32 - get user's &struct old_itimerspec32 into kernel space
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| 1020 | * @its: destination &struct itimerspec64
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| 1021 | * @uits: user's &struct old_itimerspec32
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| 1022 | *
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| 1023 | * Return: 0 on success or negative errno on error
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| 1024 |
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| 1025 | int get_old_itimerspec32(struct itimerspec64 *its,
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| 1026 | const struct old_itimerspec32 __user *uits)
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| 1027 | {
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| 1028 |
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| 1029 | if (__get_old_timespec32(&its->it_interval, &uits->it_interval) ||
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| 1030 | __get_old_timespec32(&its->it_value, &uits->it_value))
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| 1031 | return -EFAULT;
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| 1032 | return 0;
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| 1033 | }
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| 1034 | EXPORT_SYMBOL_GPL(get_old_itimerspec32);
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| 1035 |
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| 1036 | |
| 1037 | * put_old_itimerspec32 - convert &struct itimerspec64 to &struct
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| 1038 | * old_itimerspec32 and copy the latter to userspace
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| 1039 | * @its: input &struct itimerspec64
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| 1040 | * @uits: user's &struct old_itimerspec32
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| 1041 | *
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| 1042 | * Return: 0 on success or negative errno on error
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| 1043 |
|
| 1044 | int put_old_itimerspec32(const struct itimerspec64 *its,
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| 1045 | struct old_itimerspec32 __user *uits)
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| 1046 | {
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| 1047 | if (__put_old_timespec32(&its->it_interval, &uits->it_interval) ||
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| 1048 | __put_old_timespec32(&its->it_value, &uits->it_value))
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| 1049 | return -EFAULT;
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| 1050 | return 0;
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| 1051 | }
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| 1052 | EXPORT_SYMBOL_GPL(put_old_itimerspec32);
|