sys/kern/kern_p1003_1b.c

   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);