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 */ 33 34 /* p1003_1b: Real Time common code. 35 */ 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/kernel.h> 40 #include <sys/sysent.h> 41 #include <sys/proc.h> 42 #include <sys/syslog.h> 43 #include <sys/module.h> 44 #include <sys/sysproto.h> 45 #include <sys/sysctl.h> 46 47 #include <posix4/posix4.h> 48 49 MALLOC_DEFINE(M_P31B, "p1003.1b", "Posix 1003.1B"); 50 51 /* p31b_proc: Return a proc struct corresponding to a pid to operate on. 52 * 53 * Enforce permission policy. 54 * 55 * The policy is the same as for sending signals except there 56 * is no notion of process groups. 57 * 58 * pid == 0 means my process. 59 * 60 * This is disabled until I've got a permission gate in again: 61 * only root can do this. 62 */ 63 64 #if 0 65 /* 66 * This is stolen from CANSIGNAL in kern_sig: 67 * 68 * Can process p, with pcred pc, do "write flavor" operations to process q? 69 */ 70 #define CAN_AFFECT(p, pc, q) \ 71 ((pc)->pc_ucred->cr_uid == 0 || \ 72 (pc)->p_ruid == (q)->p_cred->p_ruid || \ 73 (pc)->pc_ucred->cr_uid == (q)->p_cred->p_ruid || \ 74 (pc)->p_ruid == (q)->p_ucred->cr_uid || \ 75 (pc)->pc_ucred->cr_uid == (q)->p_ucred->cr_uid) 76 #else 77 #define CAN_AFFECT(p, pc, q) ((pc)->pc_ucred->cr_uid == 0) 78 #endif 79 80 /* 81 * p31b_proc: Look up a proc from a PID. If proc is 0 it is 82 * my own proc. 83 */ 84 int p31b_proc(struct proc *p, pid_t pid, struct proc **pp) 85 { 86 int ret = 0; 87 struct proc *other_proc = 0; 88 89 if (pid == 0) 90 other_proc = p; 91 else 92 other_proc = pfind(pid); 93 94 if (other_proc) 95 { 96 /* Enforce permission policy. 97 */ 98 if (CAN_AFFECT(p, p->p_cred, other_proc)) 99 *pp = other_proc; 100 else 101 ret = EPERM; 102 } 103 else 104 ret = ESRCH; 105 106 return ret; 107 } 108 109 /* The system calls return ENOSYS if an entry is called that is 110 * not run-time supported. I am also logging since some programs 111 * start to use this when they shouldn't. That will be removed if annoying. 112 */ 113 int 114 syscall_not_present(struct proc *p, const char *s, struct nosys_args *uap) 115 { 116 log(LOG_ERR, "cmd %s pid %d tried to use non-present %s\n", 117 p->p_comm, p->p_pid, s); 118 119 /* a " return nosys(p, uap); " here causes a core dump. 120 */ 121 122 return ENOSYS; 123 } 124 125 #if !defined(_KPOSIX_PRIORITY_SCHEDULING) 126 127 /* Not configured but loadable via an LKM: 128 */ 129 130 static int sched_attach(void) 131 { 132 return 0; 133 } 134 135 SYSCALL_NOT_PRESENT_GEN(sched_setparam) 136 SYSCALL_NOT_PRESENT_GEN(sched_getparam) 137 SYSCALL_NOT_PRESENT_GEN(sched_setscheduler) 138 SYSCALL_NOT_PRESENT_GEN(sched_getscheduler) 139 SYSCALL_NOT_PRESENT_GEN(sched_yield) 140 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_max) 141 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_min) 142 SYSCALL_NOT_PRESENT_GEN(sched_rr_get_interval) 143 144 #else 145 146 /* Configured in kernel version: 147 */ 148 static struct ksched *ksched; 149 150 static int sched_attach(void) 151 { 152 int ret = ksched_attach(&ksched); 153 154 if (ret == 0) 155 p31b_setcfg(CTL_P1003_1B_PRIORITY_SCHEDULING, 1); 156 157 return ret; 158 } 159 160 int sched_setparam(struct proc *p, 161 struct sched_setparam_args *uap) 162 { 163 int e; 164 165 struct sched_param sched_param; 166 copyin(uap->param, &sched_param, sizeof(sched_param)); 167 168 (void) (0 169 || (e = p31b_proc(p, uap->pid, &p)) 170 || (e = ksched_setparam(&p->p_retval[0], ksched, p, 171 (const struct sched_param *)&sched_param)) 172 ); 173 174 return e; 175 } 176 177 int sched_getparam(struct proc *p, 178 struct sched_getparam_args *uap) 179 { 180 int e; 181 struct sched_param sched_param; 182 183 (void) (0 184 || (e = p31b_proc(p, uap->pid, &p)) 185 || (e = ksched_getparam(&p->p_retval[0], ksched, p, &sched_param)) 186 ); 187 188 if (!e) 189 copyout(&sched_param, uap->param, sizeof(sched_param)); 190 191 return e; 192 } 193 int sched_setscheduler(struct proc *p, 194 struct sched_setscheduler_args *uap) 195 { 196 int e; 197 198 struct sched_param sched_param; 199 copyin(uap->param, &sched_param, sizeof(sched_param)); 200 201 (void) (0 202 || (e = p31b_proc(p, uap->pid, &p)) 203 || (e = ksched_setscheduler(&p->p_retval[0], 204 ksched, p, uap->policy, 205 (const struct sched_param *)&sched_param)) 206 ); 207 208 return e; 209 } 210 int sched_getscheduler(struct proc *p, 211 struct sched_getscheduler_args *uap) 212 { 213 int e; 214 (void) (0 215 || (e = p31b_proc(p, uap->pid, &p)) 216 || (e = ksched_getscheduler(&p->p_retval[0], ksched, p)) 217 ); 218 219 return e; 220 } 221 int sched_yield(struct proc *p, 222 struct sched_yield_args *uap) 223 { 224 return ksched_yield(&p->p_retval[0], ksched); 225 } 226 int sched_get_priority_max(struct proc *p, 227 struct sched_get_priority_max_args *uap) 228 { 229 return ksched_get_priority_max(&p->p_retval[0], 230 ksched, uap->policy); 231 } 232 int sched_get_priority_min(struct proc *p, 233 struct sched_get_priority_min_args *uap) 234 { 235 return ksched_get_priority_min(&p->p_retval[0], 236 ksched, uap->policy); 237 } 238 int sched_rr_get_interval(struct proc *p, 239 struct sched_rr_get_interval_args *uap) 240 { 241 int e; 242 243 (void) (0 244 || (e = p31b_proc(p, uap->pid, &p)) 245 || (e = ksched_rr_get_interval(&p->p_retval[0], ksched, 246 p, uap->interval)) 247 ); 248 249 return e; 250 } 251 252 #endif 253 254 static void p31binit(void *notused) 255 { 256 (void) sched_attach(); 257 p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE); 258 } 259 260 SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL); 261