1 /* 2 * Copyright (c) 1996, 1997, 1998 3 * HD Associates, Inc. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by HD Associates, Inc 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD: src/sys/posix4/p1003_1b.c,v 1.5.2.2 2003/03/25 06:13:35 rwatson Exp $ 33 */ 34 35 /* p1003_1b: Real Time common code. 36 */ 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/kernel.h> 41 #include <sys/sysent.h> 42 #include <sys/malloc.h> 43 #include <sys/posix4.h> 44 #include <sys/proc.h> 45 #include <sys/syslog.h> 46 #include <sys/module.h> 47 #include <sys/sysproto.h> 48 #include <sys/sysctl.h> 49 #include <sys/unistd.h> 50 51 MALLOC_DEFINE(M_P31B, "p1003.1b", "Posix 1003.1B"); 52 53 /* 54 * p31b_proc: Return a proc struct corresponding to a pid to operate on. 55 * 56 * Enforce permission policy. 57 * 58 * The policy is the same as for sending signals except there 59 * is no notion of process groups. 60 * 61 * pid == 0 means my process. 62 * 63 * This is disabled until I've got a permission gate in again: 64 * only root can do this. 65 */ 66 67 #if 0 68 /* 69 * This is stolen from CANSIGNAL in kern_sig: 70 * 71 * Can process p, with pcred pc, do "write flavor" operations to process q? 72 */ 73 #define CAN_AFFECT(p, cr, q) \ 74 ((cr)->cr_uid == 0 || \ 75 (cr)->cr_ruid == (q)->p_ucred->cr_ruid || \ 76 (cr)->cr_uid == (q)->p_ucred->cr_ruid || \ 77 (cr)->cr_ruid == (q)->p_ucred->cr_uid || \ 78 (cr)->cr_uid == (q)->p_ucred->cr_uid) 79 #else 80 #define CAN_AFFECT(p, cr, q) ((cr)->cr_uid == 0) 81 #endif 82 83 #if !defined(_KPOSIX_PRIORITY_SCHEDULING) 84 85 int syscall_not_present(const char *s); 86 87 /* The system calls return ENOSYS if an entry is called that is 88 * not run-time supported. I am also logging since some programs 89 * start to use this when they shouldn't. That will be removed if annoying. 90 */ 91 int syscall_not_present(const char *s) 92 { 93 struct proc *p = curproc; 94 log(LOG_ERR, "cmd %s pid %d tried to use non-present %s\n", 95 p->p_comm, p->p_pid, s); 96 97 /* a " return nosys(p, uap); " here causes a core dump. 98 */ 99 100 return ENOSYS; 101 } 102 103 /* Not configured but loadable via a module: 104 */ 105 106 static int sched_attach(void) 107 { 108 return 0; 109 } 110 111 #define SYSCALL_NOT_PRESENT_GEN(SC) \ 112 int sys_##SC (struct SC##_args *uap) \ 113 { \ 114 return syscall_not_present(#SC); \ 115 } 116 117 SYSCALL_NOT_PRESENT_GEN(sched_setparam) 118 SYSCALL_NOT_PRESENT_GEN(sched_getparam) 119 SYSCALL_NOT_PRESENT_GEN(sched_setscheduler) 120 SYSCALL_NOT_PRESENT_GEN(sched_getscheduler) 121 SYSCALL_NOT_PRESENT_GEN(sched_yield) 122 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_max) 123 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_min) 124 SYSCALL_NOT_PRESENT_GEN(sched_rr_get_interval) 125 126 #else 127 128 /* 129 * p31b_proc: Look up a proc from a PID. If proc is 0 it is 130 * my own proc. 131 * 132 * Returns a held process in *pp. 133 */ 134 static 135 int 136 p31b_proc(pid_t pid, struct proc **pp) 137 { 138 int ret = 0; 139 struct proc *p = curproc; 140 struct proc *other_proc; 141 142 if (pid == 0) { 143 other_proc = p; 144 if (other_proc) 145 PHOLD(other_proc); 146 } else { 147 other_proc = pfind(pid); 148 /* ref from pfind() */ 149 } 150 151 if (other_proc) { 152 /* Enforce permission policy. 153 */ 154 if (CAN_AFFECT(p, p->p_ucred, other_proc)) { 155 *pp = other_proc; 156 lwkt_gettoken(&other_proc->p_token); 157 } else { 158 *pp = NULL; 159 ret = EPERM; 160 PRELE(other_proc); 161 } 162 } else { 163 *pp = NULL; 164 ret = ESRCH; 165 } 166 return ret; 167 } 168 169 static 170 void 171 p31b_proc_done(struct proc *other_proc) 172 { 173 if (other_proc) { 174 lwkt_reltoken(&other_proc->p_token); 175 PRELE(other_proc); 176 } 177 } 178 179 /* Configured in kernel version: 180 */ 181 static struct ksched *ksched; 182 183 static int sched_attach(void) 184 { 185 int ret = ksched_attach(&ksched); 186 187 if (ret == 0) 188 p31b_setcfg(CTL_P1003_1B_PRIORITY_SCHEDULING, 1); 189 190 return ret; 191 } 192 193 int 194 sys_sched_setparam(struct sched_setparam_args *uap) 195 { 196 struct proc *p; 197 struct lwp *lp; 198 struct sched_param sched_param; 199 int e; 200 201 copyin(uap->param, &sched_param, sizeof(sched_param)); 202 203 if ((e = p31b_proc(uap->pid, &p)) == 0) { 204 lp = FIRST_LWP_IN_PROC(p); /* XXX lwp */ 205 if (lp) { 206 LWPHOLD(lp); 207 lwkt_gettoken(&lp->lwp_token); 208 e = ksched_setparam(&uap->sysmsg_reg, ksched, lp, 209 (const struct sched_param *)&sched_param); 210 lwkt_reltoken(&lp->lwp_token); 211 LWPRELE(lp); 212 } else { 213 e = ESRCH; 214 } 215 p31b_proc_done(p); 216 } 217 return e; 218 } 219 220 int 221 sys_sched_getparam(struct sched_getparam_args *uap) 222 { 223 struct proc *targetp; 224 struct lwp *lp; 225 struct sched_param sched_param; 226 int e; 227 228 if ((e = p31b_proc(uap->pid, &targetp)) == 0) { 229 lp = FIRST_LWP_IN_PROC(targetp); /* XXX lwp */ 230 if (lp) { 231 LWPHOLD(lp); 232 lwkt_gettoken(&lp->lwp_token); 233 e = ksched_getparam(&uap->sysmsg_reg, ksched, 234 lp, &sched_param); 235 lwkt_reltoken(&lp->lwp_token); 236 LWPRELE(lp); 237 } else { 238 e = ESRCH; 239 } 240 p31b_proc_done(targetp); 241 } 242 if (e == 0) 243 copyout(&sched_param, uap->param, sizeof(sched_param)); 244 return e; 245 } 246 247 int 248 sys_sched_setscheduler(struct sched_setscheduler_args *uap) 249 { 250 struct proc *p; 251 struct lwp *lp; 252 int e; 253 struct sched_param sched_param; 254 255 copyin(uap->param, &sched_param, sizeof(sched_param)); 256 257 if ((e = p31b_proc(uap->pid, &p)) == 0) { 258 lp = FIRST_LWP_IN_PROC(p); /* XXX lwp */ 259 if (lp) { 260 LWPHOLD(lp); 261 lwkt_gettoken(&lp->lwp_token); 262 e = ksched_setscheduler(&uap->sysmsg_reg, ksched, 263 lp, uap->policy, 264 (const struct sched_param *)&sched_param); 265 lwkt_reltoken(&lp->lwp_token); 266 LWPRELE(lp); 267 } else { 268 e = ESRCH; 269 } 270 p31b_proc_done(p); 271 } 272 return e; 273 } 274 275 int 276 sys_sched_getscheduler(struct sched_getscheduler_args *uap) 277 { 278 struct proc *targetp; 279 struct lwp *lp; 280 int e; 281 282 if ((e = p31b_proc(uap->pid, &targetp)) == 0) { 283 lp = FIRST_LWP_IN_PROC(targetp); /* XXX lwp */ 284 if (lp) { 285 LWPHOLD(lp); 286 lwkt_gettoken(&lp->lwp_token); 287 e = ksched_getscheduler(&uap->sysmsg_reg, ksched, lp); 288 lwkt_reltoken(&lp->lwp_token); 289 LWPRELE(lp); 290 } else { 291 e = ESRCH; 292 } 293 p31b_proc_done(targetp); 294 } 295 return e; 296 } 297 298 /* 299 * MPSAFE 300 */ 301 int 302 sys_sched_yield(struct sched_yield_args *uap) 303 { 304 return ksched_yield(&uap->sysmsg_reg, ksched); 305 } 306 307 /* 308 * MPSAFE 309 */ 310 int 311 sys_sched_get_priority_max(struct sched_get_priority_max_args *uap) 312 { 313 return ksched_get_priority_max(&uap->sysmsg_reg, ksched, uap->policy); 314 } 315 316 /* 317 * MPSAFE 318 */ 319 int 320 sys_sched_get_priority_min(struct sched_get_priority_min_args *uap) 321 { 322 return ksched_get_priority_min(&uap->sysmsg_reg, ksched, uap->policy); 323 } 324 325 int 326 sys_sched_rr_get_interval(struct sched_rr_get_interval_args *uap) 327 { 328 int e; 329 struct proc *p; 330 struct lwp *lp; 331 struct timespec ts; 332 333 if ((e = p31b_proc(uap->pid, &p)) == 0) { 334 lp = FIRST_LWP_IN_PROC(p); /* XXX lwp */ 335 if (lp) { 336 LWPHOLD(lp); 337 lwkt_gettoken(&lp->lwp_token); 338 e = ksched_rr_get_interval(&uap->sysmsg_reg, ksched, 339 lp, &ts); 340 if (e == 0) 341 e = copyout(&ts, uap->interval, sizeof(ts)); 342 lwkt_reltoken(&lp->lwp_token); 343 LWPRELE(lp); 344 } else { 345 e = ESRCH; 346 } 347 p31b_proc_done(p); 348 } 349 return e; 350 } 351 352 #endif 353 354 static void 355 p31binit(void *notused) 356 { 357 sched_attach(); 358 p31b_setcfg(CTL_P1003_1B_ASYNCHRONOUS_IO, -1); 359 p31b_setcfg(CTL_P1003_1B_FSYNC, _POSIX_FSYNC); 360 p31b_setcfg(CTL_P1003_1B_MAPPED_FILES, _POSIX_MAPPED_FILES); 361 p31b_setcfg(CTL_P1003_1B_MESSAGE_PASSING, _POSIX_MESSAGE_PASSING); 362 p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE); 363 p31b_setcfg(CTL_P1003_1B_SEMAPHORES, _POSIX_SEMAPHORES); 364 p31b_setcfg(CTL_P1003_1B_SEM_NSEMS_MAX, 256); 365 p31b_setcfg(CTL_P1003_1B_SHARED_MEMORY_OBJECTS, 366 _POSIX_SHARED_MEMORY_OBJECTS); 367 368 #if 0 /* XXX missing */ 369 p31b_setcfg(CTL_P1003_1B_ASYNCHRONOUS_IO, _POSIX_ASYNCHRONOUS_IO); 370 p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, 0); 371 p31b_setcfg(CTL_P1003_1B_AIO_MAX, 0); 372 p31b_setcfg(CTL_P1003_1B_AIO_LISTIO_MAX, 0); 373 p31b_setcfg(CTL_P1003_1B_DELAYTIMER_MAX, 0); 374 p31b_setcfg(CTL_P1003_1B_MEMLOCK, 0); 375 p31b_setcfg(CTL_P1003_1B_MEMLOCK_RANGE, 0); 376 p31b_setcfg(CTL_P1003_1B_MEMORY_PROTECTION, 0); 377 p31b_setcfg(CTL_P1003_1B_PRIORITIZED_IO, _POSIX_PRIORITIZED_IO); 378 p31b_setcfg(CTL_P1003_1B_REALTIME_SIGNALS, _POSIX_REALTIME_SIGNALS); 379 p31b_setcfg(CTL_P1003_1B_RTSIG_MAX, SIGRTMAX - SIGRTMIN + 1); 380 p31b_setcfg(CTL_P1003_1B_SIGQUEUE_MAX, 0); 381 p31b_setcfg(CTL_P1003_1B_SYNCHRONIZED_IO, _POSIX_SYNCHRONIZED_IO); 382 p31b_setcfg(CTL_P1003_1B_TIMERS, _POSIX_TIMERS); 383 p31b_setcfg(CTL_P1003_1B_TIMER_MAX, 0); 384 #endif 385 } 386 387 SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL); 388