| 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 | * $DragonFly: src/sys/kern/kern_p1003_1b.c,v 1.10 2007/06/26 19:31:08 dillon Exp $ |
| 34 | */ |
| 35 | |
| 36 | /* p1003_1b: Real Time common code. |
| 37 | */ |
| 38 | |
| 39 | #include <sys/param.h> |
| 40 | #include <sys/systm.h> |
| 41 | #include <sys/kernel.h> |
| 42 | #include <sys/sysent.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 | /* p31b_proc: Return a proc struct corresponding to a pid to operate on. |
| 54 | * |
| 55 | * Enforce permission policy. |
| 56 | * |
| 57 | * The policy is the same as for sending signals except there |
| 58 | * is no notion of process groups. |
| 59 | * |
| 60 | * pid == 0 means my process. |
| 61 | * |
| 62 | * This is disabled until I've got a permission gate in again: |
| 63 | * only root can do this. |
| 64 | */ |
| 65 | |
| 66 | #if 0 |
| 67 | /* |
| 68 | * This is stolen from CANSIGNAL in kern_sig: |
| 69 | * |
| 70 | * Can process p, with pcred pc, do "write flavor" operations to process q? |
| 71 | */ |
| 72 | #define CAN_AFFECT(p, cr, q) \ |
| 73 | ((cr)->cr_uid == 0 || \ |
| 74 | (cr)->cr_ruid == (q)->p_ucred->cr_ruid || \ |
| 75 | (cr)->cr_uid == (q)->p_ucred->cr_ruid || \ |
| 76 | (cr)->cr_ruid == (q)->p_ucred->cr_uid || \ |
| 77 | (cr)->cr_uid == (q)->p_ucred->cr_uid) |
| 78 | #else |
| 79 | #define CAN_AFFECT(p, cr, q) ((cr)->cr_uid == 0) |
| 80 | #endif |
| 81 | |
| 82 | /* |
| 83 | * p31b_proc: Look up a proc from a PID. If proc is 0 it is |
| 84 | * my own proc. |
| 85 | */ |
| 86 | int p31b_proc(struct proc *p, pid_t pid, struct proc **pp) |
| 87 | { |
| 88 | int ret = 0; |
| 89 | struct proc *other_proc = 0; |
| 90 | |
| 91 | if (pid == 0) |
| 92 | other_proc = p; |
| 93 | else |
| 94 | other_proc = pfind(pid); |
| 95 | |
| 96 | if (other_proc) |
| 97 | { |
| 98 | /* Enforce permission policy. |
| 99 | */ |
| 100 | if (CAN_AFFECT(p, p->p_ucred, other_proc)) |
| 101 | *pp = other_proc; |
| 102 | else |
| 103 | ret = EPERM; |
| 104 | } |
| 105 | else |
| 106 | ret = ESRCH; |
| 107 | |
| 108 | return ret; |
| 109 | } |
| 110 | |
| 111 | |
| 112 | #if !defined(_KPOSIX_PRIORITY_SCHEDULING) |
| 113 | |
| 114 | int syscall_not_present(const char *s); |
| 115 | |
| 116 | /* The system calls return ENOSYS if an entry is called that is |
| 117 | * not run-time supported. I am also logging since some programs |
| 118 | * start to use this when they shouldn't. That will be removed if annoying. |
| 119 | */ |
| 120 | int syscall_not_present(const char *s) |
| 121 | { |
| 122 | struct proc *p = curproc; |
| 123 | log(LOG_ERR, "cmd %s pid %d tried to use non-present %s\n", |
| 124 | p->p_comm, p->p_pid, s); |
| 125 | |
| 126 | /* a " return nosys(p, uap); " here causes a core dump. |
| 127 | */ |
| 128 | |
| 129 | return ENOSYS; |
| 130 | } |
| 131 | |
| 132 | /* Not configured but loadable via a module: |
| 133 | */ |
| 134 | |
| 135 | static int sched_attach(void) |
| 136 | { |
| 137 | return 0; |
| 138 | } |
| 139 | |
| 140 | #define SYSCALL_NOT_PRESENT_GEN(SC) \ |
| 141 | int SC (struct SC##_args *uap) \ |
| 142 | { \ |
| 143 | return syscall_not_present(#SC); \ |
| 144 | } |
| 145 | |
| 146 | SYSCALL_NOT_PRESENT_GEN(sched_setparam) |
| 147 | SYSCALL_NOT_PRESENT_GEN(sched_getparam) |
| 148 | SYSCALL_NOT_PRESENT_GEN(sched_setscheduler) |
| 149 | SYSCALL_NOT_PRESENT_GEN(sched_getscheduler) |
| 150 | SYSCALL_NOT_PRESENT_GEN(sched_yield) |
| 151 | SYSCALL_NOT_PRESENT_GEN(sched_get_priority_max) |
| 152 | SYSCALL_NOT_PRESENT_GEN(sched_get_priority_min) |
| 153 | SYSCALL_NOT_PRESENT_GEN(sched_rr_get_interval) |
| 154 | |
| 155 | #else |
| 156 | |
| 157 | /* Configured in kernel version: |
| 158 | */ |
| 159 | static struct ksched *ksched; |
| 160 | |
| 161 | static int sched_attach(void) |
| 162 | { |
| 163 | int ret = ksched_attach(&ksched); |
| 164 | |
| 165 | if (ret == 0) |
| 166 | p31b_setcfg(CTL_P1003_1B_PRIORITY_SCHEDULING, 1); |
| 167 | |
| 168 | return ret; |
| 169 | } |
| 170 | |
| 171 | /* |
| 172 | * MPALMOSTSAFE |
| 173 | */ |
| 174 | int |
| 175 | sys_sched_setparam(struct sched_setparam_args *uap) |
| 176 | { |
| 177 | struct proc *p = curproc; |
| 178 | struct lwp *lp; |
| 179 | int e; |
| 180 | struct sched_param sched_param; |
| 181 | |
| 182 | copyin(uap->param, &sched_param, sizeof(sched_param)); |
| 183 | |
| 184 | get_mplock(); |
| 185 | if ((e = p31b_proc(p, uap->pid, &p)) == 0) { |
| 186 | lp = FIRST_LWP_IN_PROC(p); /* XXX lwp */ |
| 187 | e = ksched_setparam(&uap->sysmsg_reg, ksched, lp, |
| 188 | (const struct sched_param *)&sched_param); |
| 189 | } |
| 190 | rel_mplock(); |
| 191 | return e; |
| 192 | } |
| 193 | |
| 194 | /* |
| 195 | * MPALMOSTSAFE |
| 196 | */ |
| 197 | int |
| 198 | sys_sched_getparam(struct sched_getparam_args *uap) |
| 199 | { |
| 200 | struct proc *p = curproc; |
| 201 | struct proc *targetp; |
| 202 | struct lwp *lp; |
| 203 | struct sched_param sched_param; |
| 204 | int e; |
| 205 | |
| 206 | get_mplock(); |
| 207 | if (uap->pid != 0 && uap->pid != p->p_pid) { |
| 208 | e = p31b_proc(p, uap->pid, &targetp); |
| 209 | if (e) |
| 210 | goto done; |
| 211 | } else { |
| 212 | targetp = p; |
| 213 | } |
| 214 | |
| 215 | lp = FIRST_LWP_IN_PROC(targetp); /* XXX lwp */ |
| 216 | e = ksched_getparam(&uap->sysmsg_reg, ksched, lp, &sched_param); |
| 217 | done: |
| 218 | rel_mplock(); |
| 219 | if (e == 0) |
| 220 | copyout(&sched_param, uap->param, sizeof(sched_param)); |
| 221 | return e; |
| 222 | } |
| 223 | |
| 224 | /* |
| 225 | * MPALMOSTSAFE |
| 226 | */ |
| 227 | int |
| 228 | sys_sched_setscheduler(struct sched_setscheduler_args *uap) |
| 229 | { |
| 230 | struct proc *p = curproc; |
| 231 | struct lwp *lp; |
| 232 | int e; |
| 233 | struct sched_param sched_param; |
| 234 | |
| 235 | copyin(uap->param, &sched_param, sizeof(sched_param)); |
| 236 | |
| 237 | get_mplock(); |
| 238 | if ((e = p31b_proc(p, uap->pid, &p)) == 0) { |
| 239 | lp = FIRST_LWP_IN_PROC(p); /* XXX lwp */ |
| 240 | e = ksched_setscheduler(&uap->sysmsg_reg, ksched, lp, |
| 241 | uap->policy, |
| 242 | (const struct sched_param *)&sched_param); |
| 243 | } |
| 244 | rel_mplock(); |
| 245 | return e; |
| 246 | } |
| 247 | |
| 248 | /* |
| 249 | * MPALMOSTSAFE |
| 250 | */ |
| 251 | int |
| 252 | sys_sched_getscheduler(struct sched_getscheduler_args *uap) |
| 253 | { |
| 254 | struct proc *p = curproc; |
| 255 | struct proc *targetp; |
| 256 | struct lwp *lp; |
| 257 | int e; |
| 258 | |
| 259 | get_mplock(); |
| 260 | if (uap->pid != 0 && uap->pid != p->p_pid) { |
| 261 | e = p31b_proc(p, uap->pid, &targetp); |
| 262 | if (e) |
| 263 | goto done; |
| 264 | } else { |
| 265 | targetp = p; |
| 266 | } |
| 267 | |
| 268 | lp = FIRST_LWP_IN_PROC(targetp); /* XXX lwp */ |
| 269 | e = ksched_getscheduler(&uap->sysmsg_reg, ksched, lp); |
| 270 | done: |
| 271 | rel_mplock(); |
| 272 | return e; |
| 273 | } |
| 274 | |
| 275 | /* |
| 276 | * MPSAFE |
| 277 | */ |
| 278 | int |
| 279 | sys_sched_yield(struct sched_yield_args *uap) |
| 280 | { |
| 281 | return ksched_yield(&uap->sysmsg_reg, ksched); |
| 282 | } |
| 283 | |
| 284 | /* |
| 285 | * MPSAFE |
| 286 | */ |
| 287 | int |
| 288 | sys_sched_get_priority_max(struct sched_get_priority_max_args *uap) |
| 289 | { |
| 290 | return ksched_get_priority_max(&uap->sysmsg_reg, ksched, uap->policy); |
| 291 | } |
| 292 | |
| 293 | /* |
| 294 | * MPSAFE |
| 295 | */ |
| 296 | int |
| 297 | sys_sched_get_priority_min(struct sched_get_priority_min_args *uap) |
| 298 | { |
| 299 | return ksched_get_priority_min(&uap->sysmsg_reg, ksched, uap->policy); |
| 300 | } |
| 301 | |
| 302 | /* |
| 303 | * MPALMOSTSAFE |
| 304 | */ |
| 305 | int |
| 306 | sys_sched_rr_get_interval(struct sched_rr_get_interval_args *uap) |
| 307 | { |
| 308 | int e; |
| 309 | struct proc *p = curproc; |
| 310 | struct lwp *lp = curthread->td_lwp; |
| 311 | |
| 312 | get_mplock(); |
| 313 | if ((e = p31b_proc(p, uap->pid, &p)) == 0) { |
| 314 | e = ksched_rr_get_interval(&uap->sysmsg_reg, ksched, |
| 315 | lp, uap->interval); |
| 316 | } |
| 317 | rel_mplock(); |
| 318 | return e; |
| 319 | } |
| 320 | |
| 321 | #endif |
| 322 | |
| 323 | static void |
| 324 | p31binit(void *notused) |
| 325 | { |
| 326 | (void) sched_attach(); |
| 327 | p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE); |
| 328 | p31b_setcfg(CTL_P1003_1B_MESSAGE_PASSING, _POSIX_MESSAGE_PASSING); |
| 329 | } |
| 330 | |
| 331 | SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL); |