2 * Copyright (c) 1996, 1997, 1998
3 * HD Associates, Inc. All rights reserved.
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15 * This product includes software developed by HD Associates, Inc
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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
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 $
36 /* p1003_1b: Real Time common code.
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>
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>
51 MALLOC_DEFINE(M_P31B, "p1003.1b", "Posix 1003.1B");
53 /* p31b_proc: Return a proc struct corresponding to a pid to operate on.
55 * Enforce permission policy.
57 * The policy is the same as for sending signals except there
58 * is no notion of process groups.
60 * pid == 0 means my process.
62 * This is disabled until I've got a permission gate in again:
63 * only root can do this.
68 * This is stolen from CANSIGNAL in kern_sig:
70 * Can process p, with pcred pc, do "write flavor" operations to process q?
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)
79 #define CAN_AFFECT(p, cr, q) ((cr)->cr_uid == 0)
83 * p31b_proc: Look up a proc from a PID. If proc is 0 it is
86 int p31b_proc(struct proc *p, pid_t pid, struct proc **pp)
89 struct proc *other_proc = 0;
94 other_proc = pfind(pid);
98 /* Enforce permission policy.
100 if (CAN_AFFECT(p, p->p_ucred, other_proc))
112 #if !defined(_KPOSIX_PRIORITY_SCHEDULING)
114 int syscall_not_present(const char *s);
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.
120 int syscall_not_present(const char *s)
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);
126 /* a " return nosys(p, uap); " here causes a core dump.
132 /* Not configured but loadable via a module:
135 static int sched_attach(void)
140 #define SYSCALL_NOT_PRESENT_GEN(SC) \
141 int SC (struct SC##_args *uap) \
143 return syscall_not_present(#SC); \
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)
157 /* Configured in kernel version:
159 static struct ksched *ksched;
161 static int sched_attach(void)
163 int ret = ksched_attach(&ksched);
166 p31b_setcfg(CTL_P1003_1B_PRIORITY_SCHEDULING, 1);
172 sys_sched_setparam(struct sched_setparam_args *uap)
174 struct proc *p = curproc;
178 struct sched_param sched_param;
179 copyin(uap->param, &sched_param, sizeof(sched_param));
181 if ((e = p31b_proc(p, uap->pid, &p)) == 0) {
182 lp = FIRST_LWP_IN_PROC(p); /* XXX lwp */
183 e = ksched_setparam(&uap->sysmsg_reg, ksched, lp,
184 (const struct sched_param *)&sched_param);
190 sys_sched_getparam(struct sched_getparam_args *uap)
192 struct proc *p = curproc;
193 struct proc *targetp;
195 struct sched_param sched_param;
198 if (uap->pid != 0 && uap->pid != p->p_pid) {
199 e = p31b_proc(p, uap->pid, &targetp);
206 lp = FIRST_LWP_IN_PROC(targetp); /* XXX lwp */
207 e = ksched_getparam(&uap->sysmsg_reg, ksched, lp, &sched_param);
210 copyout(&sched_param, uap->param, sizeof(sched_param));
216 sys_sched_setscheduler(struct sched_setscheduler_args *uap)
218 struct proc *p = curproc;
222 struct sched_param sched_param;
223 copyin(uap->param, &sched_param, sizeof(sched_param));
225 if ((e = p31b_proc(p, uap->pid, &p)) == 0) {
226 lp = FIRST_LWP_IN_PROC(p); /* XXX lwp */
227 e = ksched_setscheduler(&uap->sysmsg_reg, ksched, lp,
228 uap->policy, (const struct sched_param *)&sched_param);
234 sys_sched_getscheduler(struct sched_getscheduler_args *uap)
236 struct proc *p = curproc;
237 struct proc *targetp;
241 if (uap->pid != 0 && uap->pid != p->p_pid) {
242 e = p31b_proc(p, uap->pid, &targetp);
249 lp = FIRST_LWP_IN_PROC(targetp); /* XXX lwp */
250 e = ksched_getscheduler(&uap->sysmsg_reg, ksched, lp);
256 sys_sched_yield(struct sched_yield_args *uap)
258 return ksched_yield(&uap->sysmsg_reg, ksched);
262 sys_sched_get_priority_max(struct sched_get_priority_max_args *uap)
264 return ksched_get_priority_max(&uap->sysmsg_reg, ksched, uap->policy);
268 sys_sched_get_priority_min(struct sched_get_priority_min_args *uap)
270 return ksched_get_priority_min(&uap->sysmsg_reg, ksched, uap->policy);
274 sys_sched_rr_get_interval(struct sched_rr_get_interval_args *uap)
277 struct proc *p = curproc;
278 struct lwp *lp = curthread->td_lwp;
280 if ((e = p31b_proc(p, uap->pid, &p)) == 0) {
281 e = ksched_rr_get_interval(&uap->sysmsg_reg, ksched,
289 static void p31binit(void *notused)
291 (void) sched_attach();
292 p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE);
293 p31b_setcfg(CTL_P1003_1B_MESSAGE_PASSING, _POSIX_MESSAGE_PASSING);
296 SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL);