1 /* $NetBSD: linux_time.c,v 1.37 2014/01/13 10:33:03 njoly 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 1.37 2014/01/13 10:33:03 njoly 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 /* 106 * If user is not the superuser, we returned 107 * after the sys_settimeofday() call. 108 */ 109 if (SCARG(uap, tzp)) { 110 error = copyin(SCARG(uap, tzp), &linux_sys_tz, sizeof(linux_sys_tz)); 111 if (error) 112 return (error); 113 } 114 115 return (0); 116 } 117 118 void 119 native_to_linux_timespec(struct linux_timespec *ltp, struct timespec *ntp) 120 { 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 ntp->tv_sec = ltp->tv_sec; 129 ntp->tv_nsec = ltp->tv_nsec; 130 } 131 132 int 133 linux_sys_nanosleep(struct lwp *l, const struct linux_sys_nanosleep_args *uap, 134 register_t *retval) 135 { 136 /* { 137 syscallarg(struct linux_timespec *) rqtp; 138 syscallarg(struct linux_timespec *) rmtp; 139 } */ 140 struct timespec rqts, rmts; 141 struct linux_timespec lrqts, lrmts; 142 int error, error1; 143 144 error = copyin(SCARG(uap, rqtp), &lrqts, sizeof(lrqts)); 145 if (error != 0) 146 return error; 147 linux_to_native_timespec(&rqts, &lrqts); 148 149 error = nanosleep1(l, CLOCK_MONOTONIC, 0, &rqts, 150 SCARG(uap, rmtp) ? &rmts : NULL); 151 if (SCARG(uap, rmtp) == NULL || (error != 0 && error != EINTR)) 152 return error; 153 154 native_to_linux_timespec(&lrmts, &rmts); 155 error1 = copyout(&lrmts, SCARG(uap, rmtp), sizeof(lrmts)); 156 return error1 ? error1 : error; 157 } 158 159 int 160 linux_to_native_clockid(clockid_t *n, clockid_t l) 161 { 162 switch (l) { 163 case LINUX_CLOCK_REALTIME: 164 *n = CLOCK_REALTIME; 165 break; 166 case LINUX_CLOCK_MONOTONIC: 167 *n = CLOCK_MONOTONIC; 168 break; 169 case LINUX_CLOCK_PROCESS_CPUTIME_ID: 170 case LINUX_CLOCK_THREAD_CPUTIME_ID: 171 case LINUX_CLOCK_REALTIME_HR: 172 case LINUX_CLOCK_MONOTONIC_HR: 173 default: 174 return EINVAL; 175 } 176 177 return 0; 178 } 179 180 int 181 linux_sys_clock_gettime(struct lwp *l, const struct linux_sys_clock_gettime_args *uap, register_t *retval) 182 { 183 /* { 184 syscallarg(clockid_t) which; 185 syscallarg(struct linux_timespec *)tp; 186 } */ 187 int error; 188 clockid_t id; 189 struct timespec ts; 190 struct linux_timespec lts; 191 192 error = linux_to_native_clockid(&id, SCARG(uap, which)); 193 if (error != 0) 194 return error; 195 196 error = clock_gettime1(id, &ts); 197 if (error != 0) 198 return error; 199 200 native_to_linux_timespec(<s, &ts); 201 return copyout(<s, SCARG(uap, tp), sizeof lts); 202 } 203 204 int 205 linux_sys_clock_settime(struct lwp *l, const struct linux_sys_clock_settime_args *uap, register_t *retval) 206 { 207 /* { 208 syscallarg(clockid_t) which; 209 syscallarg(struct linux_timespec *)tp; 210 } */ 211 struct timespec ts; 212 struct linux_timespec lts; 213 clockid_t id; 214 int error; 215 216 error = linux_to_native_clockid(&id, SCARG(uap, which)); 217 if (error != 0) 218 return error; 219 220 error = copyin(SCARG(uap, tp), <s, sizeof lts); 221 if (error != 0) 222 return error; 223 224 linux_to_native_timespec(&ts, <s); 225 226 return clock_settime1(l->l_proc, id, &ts, true); 227 } 228 229 int 230 linux_sys_clock_getres(struct lwp *l, const struct linux_sys_clock_getres_args *uap, register_t *retval) 231 { 232 /* { 233 syscallarg(clockid_t) which; 234 syscallarg(struct linux_timespec *)tp; 235 } */ 236 struct timespec ts; 237 struct linux_timespec lts; 238 int error; 239 clockid_t nwhich = 0; /* XXX: GCC */ 240 241 error = linux_to_native_clockid(&nwhich, SCARG(uap, which)); 242 if (error != 0 || SCARG(uap, tp) == NULL) 243 return error; 244 245 error = clock_getres1(nwhich, &ts); 246 if (error != 0) 247 return error; 248 249 native_to_linux_timespec(<s, &ts); 250 return copyout(<s, SCARG(uap, tp), sizeof lts); 251 } 252 253 int 254 linux_sys_clock_nanosleep(struct lwp *l, const struct linux_sys_clock_nanosleep_args *uap, register_t *retval) 255 { 256 /* { 257 syscallarg(clockid_t) which; 258 syscallarg(int) flags; 259 syscallarg(struct linux_timespec) *rqtp; 260 syscallarg(struct linux_timespec) *rmtp; 261 } */ 262 struct linux_timespec lrqts, lrmts; 263 struct timespec rqts, rmts; 264 int error, error1, flags; 265 clockid_t nwhich; 266 267 flags = SCARG(uap, flags) != 0 ? TIMER_ABSTIME : 0; 268 269 error = linux_to_native_clockid(&nwhich, SCARG(uap, which)); 270 if (error != 0) 271 return error; 272 273 error = copyin(SCARG(uap, rqtp), &lrqts, sizeof lrqts); 274 if (error != 0) 275 return error; 276 277 linux_to_native_timespec(&rqts, &lrqts); 278 279 error = nanosleep1(l, nwhich, flags, &rqts, 280 SCARG(uap, rmtp) ? &rmts : NULL); 281 if (SCARG(uap, rmtp) == NULL || (error != 0 && error != EINTR)) 282 return error; 283 284 native_to_linux_timespec(&lrmts, &rmts); 285 error1 = copyout(&lrmts, SCARG(uap, rmtp), sizeof lrmts); 286 return error1 ? error1 : error; 287 } 288