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 50 MALLOC_DEFINE(M_P31B, "p1003.1b", "Posix 1003.1B"); 51 52 /* p31b_proc: Return a proc struct corresponding to a pid to operate on. 53 * 54 * Enforce permission policy. 55 * 56 * The policy is the same as for sending signals except there 57 * is no notion of process groups. 58 * 59 * pid == 0 means my process. 60 * 61 * This is disabled until I've got a permission gate in again: 62 * only root can do this. 63 */ 64 65 #if 0 66 /* 67 * This is stolen from CANSIGNAL in kern_sig: 68 * 69 * Can process p, with pcred pc, do "write flavor" operations to process q? 70 */ 71 #define CAN_AFFECT(p, cr, q) \ 72 ((cr)->cr_uid == 0 || \ 73 (cr)->cr_ruid == (q)->p_ucred->cr_ruid || \ 74 (cr)->cr_uid == (q)->p_ucred->cr_ruid || \ 75 (cr)->cr_ruid == (q)->p_ucred->cr_uid || \ 76 (cr)->cr_uid == (q)->p_ucred->cr_uid) 77 #else 78 #define CAN_AFFECT(p, cr, q) ((cr)->cr_uid == 0) 79 #endif 80 81 /* 82 * p31b_proc: Look up a proc from a PID. If proc is 0 it is 83 * my own proc. 84 */ 85 int p31b_proc(struct proc *p, pid_t pid, struct proc **pp) 86 { 87 int ret = 0; 88 struct proc *other_proc = 0; 89 90 if (pid == 0) 91 other_proc = p; 92 else 93 other_proc = pfind(pid); 94 95 if (other_proc) 96 { 97 /* Enforce permission policy. 98 */ 99 if (CAN_AFFECT(p, p->p_ucred, other_proc)) 100 *pp = other_proc; 101 else 102 ret = EPERM; 103 } 104 else 105 ret = ESRCH; 106 107 return ret; 108 } 109 110 111 #if !defined(_KPOSIX_PRIORITY_SCHEDULING) 112 113 int syscall_not_present(const char *s); 114 115 /* The system calls return ENOSYS if an entry is called that is 116 * not run-time supported. I am also logging since some programs 117 * start to use this when they shouldn't. That will be removed if annoying. 118 */ 119 int syscall_not_present(const char *s) 120 { 121 struct proc *p = curproc; 122 log(LOG_ERR, "cmd %s pid %d tried to use non-present %s\n", 123 p->p_comm, p->p_pid, s); 124 125 /* a " return nosys(p, uap); " here causes a core dump. 126 */ 127 128 return ENOSYS; 129 } 130 131 /* Not configured but loadable via a module: 132 */ 133 134 static int sched_attach(void) 135 { 136 return 0; 137 } 138 139 #define SYSCALL_NOT_PRESENT_GEN(SC) \ 140 int SC (struct SC##_args *uap) \ 141 { \ 142 return syscall_not_present(#SC); \ 143 } 144 145 SYSCALL_NOT_PRESENT_GEN(sched_setparam) 146 SYSCALL_NOT_PRESENT_GEN(sched_getparam) 147 SYSCALL_NOT_PRESENT_GEN(sched_setscheduler) 148 SYSCALL_NOT_PRESENT_GEN(sched_getscheduler) 149 SYSCALL_NOT_PRESENT_GEN(sched_yield) 150 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_max) 151 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_min) 152 SYSCALL_NOT_PRESENT_GEN(sched_rr_get_interval) 153 154 #else 155 156 /* Configured in kernel version: 157 */ 158 static struct ksched *ksched; 159 160 static int sched_attach(void) 161 { 162 int ret = ksched_attach(&ksched); 163 164 if (ret == 0) 165 p31b_setcfg(CTL_P1003_1B_PRIORITY_SCHEDULING, 1); 166 167 return ret; 168 } 169 170 int 171 sys_sched_setparam(struct sched_setparam_args *uap) 172 { 173 struct proc *p = curproc; 174 struct lwp *lp; 175 int e; 176 177 struct sched_param sched_param; 178 copyin(uap->param, &sched_param, sizeof(sched_param)); 179 180 if ((e = p31b_proc(p, uap->pid, &p)) == 0) { 181 lp = FIRST_LWP_IN_PROC(p); /* XXX lwp */ 182 e = ksched_setparam(&uap->sysmsg_result, ksched, lp, 183 (const struct sched_param *)&sched_param); 184 } 185 return e; 186 } 187 188 int 189 sys_sched_getparam(struct sched_getparam_args *uap) 190 { 191 struct proc *p = curproc; 192 struct proc *targetp; 193 struct lwp *lp; 194 struct sched_param sched_param; 195 int e; 196 197 if (uap->pid != 0 && uap->pid != p->p_pid) { 198 e = p31b_proc(p, uap->pid, &targetp); 199 if (e) 200 return e; 201 } else { 202 targetp = p; 203 } 204 205 lp = FIRST_LWP_IN_PROC(targetp); /* XXX lwp */ 206 e = ksched_getparam(&uap->sysmsg_result, ksched, lp, &sched_param); 207 208 if (!e) 209 copyout(&sched_param, uap->param, sizeof(sched_param)); 210 211 return e; 212 } 213 214 int 215 sys_sched_setscheduler(struct sched_setscheduler_args *uap) 216 { 217 struct proc *p = curproc; 218 struct lwp *lp; 219 int e; 220 221 struct sched_param sched_param; 222 copyin(uap->param, &sched_param, sizeof(sched_param)); 223 224 if ((e = p31b_proc(p, uap->pid, &p)) == 0) { 225 lp = FIRST_LWP_IN_PROC(p); /* XXX lwp */ 226 e = ksched_setscheduler(&uap->sysmsg_result, ksched, lp, 227 uap->policy, (const struct sched_param *)&sched_param); 228 } 229 return e; 230 } 231 232 int 233 sys_sched_getscheduler(struct sched_getscheduler_args *uap) 234 { 235 struct proc *p = curproc; 236 struct proc *targetp; 237 struct lwp *lp; 238 int e; 239 240 if (uap->pid != 0 && uap->pid != p->p_pid) { 241 e = p31b_proc(p, uap->pid, &targetp); 242 if (e) 243 return e; 244 } else { 245 targetp = p; 246 } 247 248 lp = FIRST_LWP_IN_PROC(targetp); /* XXX lwp */ 249 e = ksched_getscheduler(&uap->sysmsg_result, ksched, lp); 250 251 return e; 252 } 253 254 int 255 sys_sched_yield(struct sched_yield_args *uap) 256 { 257 return ksched_yield(&uap->sysmsg_result, ksched); 258 } 259 260 int 261 sys_sched_get_priority_max(struct sched_get_priority_max_args *uap) 262 { 263 return ksched_get_priority_max(&uap->sysmsg_result, ksched, uap->policy); 264 } 265 266 int 267 sys_sched_get_priority_min(struct sched_get_priority_min_args *uap) 268 { 269 return ksched_get_priority_min(&uap->sysmsg_result, ksched, uap->policy); 270 } 271 272 int 273 sys_sched_rr_get_interval(struct sched_rr_get_interval_args *uap) 274 { 275 int e; 276 struct proc *p = curproc; 277 struct lwp *lp = curthread->td_lwp; 278 279 if ((e = p31b_proc(p, uap->pid, &p)) == 0) { 280 e = ksched_rr_get_interval(&uap->sysmsg_result, ksched, 281 lp, uap->interval); 282 } 283 return e; 284 } 285 286 #endif 287 288 static void p31binit(void *notused) 289 { 290 (void) sched_attach(); 291 p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE); 292 } 293 294 SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL); 295