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32 * $FreeBSD: src/sys/posix4/p1003_1b.c,v 1.5.2.2 2003/03/25 06:13:35 rwatson Exp $
35 /* p1003_1b: Real Time common code.
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/kernel.h>
41 #include <sys/sysent.h>
42 #include <sys/posix4.h>
44 #include <sys/syslog.h>
45 #include <sys/module.h>
46 #include <sys/sysproto.h>
47 #include <sys/sysctl.h>
48 #include <sys/unistd.h>
50 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 * Returns a held process in *pp.
90 p31b_proc(pid_t pid, struct proc **pp)
93 struct proc *p = curproc;
94 struct proc *other_proc;
101 other_proc = pfind(pid);
102 /* ref from pfind() */
106 /* Enforce permission policy.
108 if (CAN_AFFECT(p, p->p_ucred, other_proc)) {
110 lwkt_gettoken(&other_proc->p_token);
125 p31b_proc_done(struct proc *other_proc)
128 lwkt_reltoken(&other_proc->p_token);
134 #if !defined(_KPOSIX_PRIORITY_SCHEDULING)
136 int syscall_not_present(const char *s);
138 /* The system calls return ENOSYS if an entry is called that is
139 * not run-time supported. I am also logging since some programs
140 * start to use this when they shouldn't. That will be removed if annoying.
142 int syscall_not_present(const char *s)
144 struct proc *p = curproc;
145 log(LOG_ERR, "cmd %s pid %d tried to use non-present %s\n",
146 p->p_comm, p->p_pid, s);
148 /* a " return nosys(p, uap); " here causes a core dump.
154 /* Not configured but loadable via a module:
157 static int sched_attach(void)
162 #define SYSCALL_NOT_PRESENT_GEN(SC) \
163 int sys_##SC (struct SC##_args *uap) \
165 return syscall_not_present(#SC); \
168 SYSCALL_NOT_PRESENT_GEN(sched_setparam)
169 SYSCALL_NOT_PRESENT_GEN(sched_getparam)
170 SYSCALL_NOT_PRESENT_GEN(sched_setscheduler)
171 SYSCALL_NOT_PRESENT_GEN(sched_getscheduler)
172 SYSCALL_NOT_PRESENT_GEN(sched_yield)
173 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_max)
174 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_min)
175 SYSCALL_NOT_PRESENT_GEN(sched_rr_get_interval)
179 /* Configured in kernel version:
181 static struct ksched *ksched;
183 static int sched_attach(void)
185 int ret = ksched_attach(&ksched);
188 p31b_setcfg(CTL_P1003_1B_PRIORITY_SCHEDULING, 1);
194 sys_sched_setparam(struct sched_setparam_args *uap)
198 struct sched_param sched_param;
201 copyin(uap->param, &sched_param, sizeof(sched_param));
203 if ((e = p31b_proc(uap->pid, &p)) == 0) {
204 lp = FIRST_LWP_IN_PROC(p); /* XXX lwp */
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);
221 sys_sched_getparam(struct sched_getparam_args *uap)
223 struct proc *targetp;
225 struct sched_param sched_param;
228 if ((e = p31b_proc(uap->pid, &targetp)) == 0) {
229 lp = FIRST_LWP_IN_PROC(targetp); /* XXX lwp */
232 lwkt_gettoken(&lp->lwp_token);
233 e = ksched_getparam(&uap->sysmsg_reg, ksched,
235 lwkt_reltoken(&lp->lwp_token);
240 p31b_proc_done(targetp);
243 copyout(&sched_param, uap->param, sizeof(sched_param));
248 sys_sched_setscheduler(struct sched_setscheduler_args *uap)
253 struct sched_param sched_param;
255 copyin(uap->param, &sched_param, sizeof(sched_param));
257 if ((e = p31b_proc(uap->pid, &p)) == 0) {
258 lp = FIRST_LWP_IN_PROC(p); /* XXX lwp */
261 lwkt_gettoken(&lp->lwp_token);
262 e = ksched_setscheduler(&uap->sysmsg_reg, ksched,
264 (const struct sched_param *)&sched_param);
265 lwkt_reltoken(&lp->lwp_token);
276 sys_sched_getscheduler(struct sched_getscheduler_args *uap)
278 struct proc *targetp;
282 if ((e = p31b_proc(uap->pid, &targetp)) == 0) {
283 lp = FIRST_LWP_IN_PROC(targetp); /* XXX lwp */
286 lwkt_gettoken(&lp->lwp_token);
287 e = ksched_getscheduler(&uap->sysmsg_reg, ksched, lp);
288 lwkt_reltoken(&lp->lwp_token);
293 p31b_proc_done(targetp);
302 sys_sched_yield(struct sched_yield_args *uap)
304 return ksched_yield(&uap->sysmsg_reg, ksched);
311 sys_sched_get_priority_max(struct sched_get_priority_max_args *uap)
313 return ksched_get_priority_max(&uap->sysmsg_reg, ksched, uap->policy);
320 sys_sched_get_priority_min(struct sched_get_priority_min_args *uap)
322 return ksched_get_priority_min(&uap->sysmsg_reg, ksched, uap->policy);
326 sys_sched_rr_get_interval(struct sched_rr_get_interval_args *uap)
333 if ((e = p31b_proc(uap->pid, &p)) == 0) {
334 lp = FIRST_LWP_IN_PROC(p); /* XXX lwp */
337 lwkt_gettoken(&lp->lwp_token);
338 e = ksched_rr_get_interval(&uap->sysmsg_reg, ksched,
341 e = copyout(&ts, uap->interval, sizeof(ts));
342 lwkt_reltoken(&lp->lwp_token);
355 p31binit(void *notused)
357 (void) sched_attach();
358 p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE);
359 p31b_setcfg(CTL_P1003_1B_ASYNCHRONOUS_IO, -1);
360 p31b_setcfg(CTL_P1003_1B_MESSAGE_PASSING, _POSIX_MESSAGE_PASSING);
363 SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL);