1 /* $NetBSD: linux_time.c,v 1.40 2021/09/07 11:43:04 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Emmanuel Dreyfus. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: linux_time.c,v 1.40 2021/09/07 11:43:04 riastradh Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/ucred.h> 37 #include <sys/kauth.h> 38 #include <sys/mount.h> 39 #include <sys/signal.h> 40 #include <sys/stdint.h> 41 #include <sys/time.h> 42 #include <sys/systm.h> 43 #include <sys/sched.h> 44 #include <sys/syscallargs.h> 45 #include <sys/lwp.h> 46 #include <sys/proc.h> 47 48 #include <compat/linux/common/linux_types.h> 49 #include <compat/linux/common/linux_signal.h> 50 #include <compat/linux/common/linux_machdep.h> 51 #include <compat/linux/common/linux_sched.h> 52 #include <compat/linux/common/linux_ipc.h> 53 #include <compat/linux/common/linux_sem.h> 54 55 #include <compat/linux/linux_syscallargs.h> 56 57 #include <compat/common/compat_util.h> 58 59 /* 60 * Linux keeps track of a system timezone in the kernel. It is readen 61 * by gettimeofday and set by settimeofday. This emulates this behavior 62 * See linux/kernel/time.c 63 */ 64 struct timezone linux_sys_tz; 65 66 int 67 linux_sys_gettimeofday(struct lwp *l, const struct linux_sys_gettimeofday_args *uap, register_t *retval) 68 { 69 /* { 70 syscallarg(struct timeval50 *) tz; 71 syscallarg(struct timezone *) tzp; 72 } */ 73 int error = 0; 74 75 if (SCARG(uap, tp)) { 76 error = compat_50_sys_gettimeofday(l, (const void *)uap, retval); 77 if (error) 78 return (error); 79 } 80 81 if (SCARG(uap, tzp)) { 82 error = copyout(&linux_sys_tz, SCARG(uap, tzp), sizeof(linux_sys_tz)); 83 if (error) 84 return (error); 85 } 86 87 return (0); 88 } 89 90 int 91 linux_sys_settimeofday(struct lwp *l, const struct linux_sys_settimeofday_args *uap, register_t *retval) 92 { 93 /* { 94 syscallarg(struct timeval50 *) tp; 95 syscallarg(struct timezone *) tzp; 96 } */ 97 int error = 0; 98 99 if (SCARG(uap, tp)) { 100 error = compat_50_sys_settimeofday(l, (const void *)uap, retval); 101 if (error) 102 return (error); 103 } 104 105 if (SCARG(uap, tzp)) { 106 if (kauth_authorize_generic(kauth_cred_get(), 107 KAUTH_GENERIC_ISSUSER, NULL) != 0) 108 return (EPERM); 109 error = copyin(SCARG(uap, tzp), &linux_sys_tz, sizeof(linux_sys_tz)); 110 if (error) 111 return (error); 112 } 113 114 return (0); 115 } 116 117 void 118 native_to_linux_timespec(struct linux_timespec *ltp, struct timespec *ntp) 119 { 120 memset(ltp, 0, sizeof(*ltp)); 121 ltp->tv_sec = ntp->tv_sec; 122 ltp->tv_nsec = ntp->tv_nsec; 123 } 124 125 void 126 linux_to_native_timespec(struct timespec *ntp, struct linux_timespec *ltp) 127 { 128 memset(ntp, 0, sizeof(*ntp)); 129 ntp->tv_sec = ltp->tv_sec; 130 ntp->tv_nsec = ltp->tv_nsec; 131 } 132 133 int 134 linux_sys_nanosleep(struct lwp *l, const struct linux_sys_nanosleep_args *uap, 135 register_t *retval) 136 { 137 /* { 138 syscallarg(struct linux_timespec *) rqtp; 139 syscallarg(struct linux_timespec *) rmtp; 140 } */ 141 struct timespec rqts, rmts; 142 struct linux_timespec lrqts, lrmts; 143 int error, error1; 144 145 error = copyin(SCARG(uap, rqtp), &lrqts, sizeof(lrqts)); 146 if (error != 0) 147 return error; 148 linux_to_native_timespec(&rqts, &lrqts); 149 150 error = nanosleep1(l, CLOCK_MONOTONIC, 0, &rqts, 151 SCARG(uap, rmtp) ? &rmts : NULL); 152 if (SCARG(uap, rmtp) == NULL || (error != 0 && error != EINTR)) 153 return error; 154 155 native_to_linux_timespec(&lrmts, &rmts); 156 error1 = copyout(&lrmts, SCARG(uap, rmtp), sizeof(lrmts)); 157 return error1 ? error1 : error; 158 } 159 160 int 161 linux_to_native_clockid(clockid_t *n, clockid_t l) 162 { 163 switch (l) { 164 case LINUX_CLOCK_REALTIME: 165 *n = CLOCK_REALTIME; 166 break; 167 case LINUX_CLOCK_MONOTONIC: 168 *n = CLOCK_MONOTONIC; 169 break; 170 case LINUX_CLOCK_PROCESS_CPUTIME_ID: 171 case LINUX_CLOCK_THREAD_CPUTIME_ID: 172 case LINUX_CLOCK_REALTIME_HR: 173 case LINUX_CLOCK_MONOTONIC_HR: 174 default: 175 return EINVAL; 176 } 177 178 return 0; 179 } 180 181 int 182 linux_sys_clock_gettime(struct lwp *l, const struct linux_sys_clock_gettime_args *uap, register_t *retval) 183 { 184 /* { 185 syscallarg(clockid_t) which; 186 syscallarg(struct linux_timespec *)tp; 187 } */ 188 int error; 189 clockid_t id; 190 struct timespec ts; 191 struct linux_timespec lts; 192 193 error = linux_to_native_clockid(&id, SCARG(uap, which)); 194 if (error != 0) 195 return error; 196 197 error = clock_gettime1(id, &ts); 198 if (error != 0) 199 return error; 200 201 native_to_linux_timespec(<s, &ts); 202 return copyout(<s, SCARG(uap, tp), sizeof lts); 203 } 204 205 int 206 linux_sys_clock_settime(struct lwp *l, const struct linux_sys_clock_settime_args *uap, register_t *retval) 207 { 208 /* { 209 syscallarg(clockid_t) which; 210 syscallarg(struct linux_timespec *)tp; 211 } */ 212 struct timespec ts; 213 struct linux_timespec lts; 214 clockid_t id; 215 int error; 216 217 error = linux_to_native_clockid(&id, SCARG(uap, which)); 218 if (error != 0) 219 return error; 220 221 error = copyin(SCARG(uap, tp), <s, sizeof lts); 222 if (error != 0) 223 return error; 224 225 linux_to_native_timespec(&ts, <s); 226 227 return clock_settime1(l->l_proc, id, &ts, true); 228 } 229 230 int 231 linux_sys_clock_getres(struct lwp *l, const struct linux_sys_clock_getres_args *uap, register_t *retval) 232 { 233 /* { 234 syscallarg(clockid_t) which; 235 syscallarg(struct linux_timespec *)tp; 236 } */ 237 struct timespec ts; 238 struct linux_timespec lts; 239 int error; 240 clockid_t nwhich = 0; /* XXX: GCC */ 241 242 error = linux_to_native_clockid(&nwhich, SCARG(uap, which)); 243 if (error != 0 || SCARG(uap, tp) == NULL) 244 return error; 245 246 error = clock_getres1(nwhich, &ts); 247 if (error != 0) 248 return error; 249 250 native_to_linux_timespec(<s, &ts); 251 return copyout(<s, SCARG(uap, tp), sizeof lts); 252 } 253 254 int 255 linux_sys_clock_nanosleep(struct lwp *l, const struct linux_sys_clock_nanosleep_args *uap, register_t *retval) 256 { 257 /* { 258 syscallarg(clockid_t) which; 259 syscallarg(int) flags; 260 syscallarg(struct linux_timespec) *rqtp; 261 syscallarg(struct linux_timespec) *rmtp; 262 } */ 263 struct linux_timespec lrqts, lrmts; 264 struct timespec rqts, rmts; 265 int error, error1, flags; 266 clockid_t nwhich; 267 268 flags = SCARG(uap, flags) != 0 ? TIMER_ABSTIME : 0; 269 270 error = linux_to_native_clockid(&nwhich, SCARG(uap, which)); 271 if (error != 0) 272 return error; 273 274 error = copyin(SCARG(uap, rqtp), &lrqts, sizeof lrqts); 275 if (error != 0) 276 return error; 277 278 linux_to_native_timespec(&rqts, &lrqts); 279 280 error = nanosleep1(l, nwhich, flags, &rqts, 281 SCARG(uap, rmtp) ? &rmts : NULL); 282 if (SCARG(uap, rmtp) == NULL || (error != 0 && error != EINTR)) 283 return error; 284 285 native_to_linux_timespec(&lrmts, &rmts); 286 error1 = copyout(&lrmts, SCARG(uap, rmtp), sizeof lrmts); 287 return error1 ? error1 : error; 288 } 289