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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>
43 #include <sys/syslog.h>
44 #include <sys/module.h>
45 #include <sys/sysproto.h>
46 #include <sys/sysctl.h>
48 #include <posix4/posix4.h>
50 MALLOC_DEFINE(M_P31B, "p1003.1b", "Posix 1003.1B");
52 /* p31b_proc: Return a proc struct corresponding to a pid to operate on.
54 * Enforce permission policy.
56 * The policy is the same as for sending signals except there
57 * is no notion of process groups.
59 * pid == 0 means my process.
61 * This is disabled until I've got a permission gate in again:
62 * only root can do this.
67 * This is stolen from CANSIGNAL in kern_sig:
69 * Can process p, with pcred pc, do "write flavor" operations to process q?
71 #define CAN_AFFECT(p, pc, q) \
72 ((pc)->pc_ucred->cr_uid == 0 || \
73 (pc)->p_ruid == (q)->p_cred->p_ruid || \
74 (pc)->pc_ucred->cr_uid == (q)->p_cred->p_ruid || \
75 (pc)->p_ruid == (q)->p_ucred->cr_uid || \
76 (pc)->pc_ucred->cr_uid == (q)->p_ucred->cr_uid)
78 #define CAN_AFFECT(p, pc, q) ((pc)->pc_ucred->cr_uid == 0)
82 * p31b_proc: Look up a proc from a PID. If proc is 0 it is
85 int p31b_proc(struct proc *p, pid_t pid, struct proc **pp)
88 struct proc *other_proc = 0;
93 other_proc = pfind(pid);
97 /* Enforce permission policy.
99 if (CAN_AFFECT(p, p->p_cred, other_proc))
110 /* The system calls return ENOSYS if an entry is called that is
111 * not run-time supported. I am also logging since some programs
112 * start to use this when they shouldn't. That will be removed if annoying.
115 syscall_not_present(struct proc *p, const char *s, struct nosys_args *uap)
117 log(LOG_ERR, "cmd %s pid %d tried to use non-present %s\n",
118 p->p_comm, p->p_pid, s);
120 /* a " return nosys(p, uap); " here causes a core dump.
126 #if !defined(_KPOSIX_PRIORITY_SCHEDULING)
128 /* Not configured but loadable via a module:
131 static int sched_attach(void)
136 SYSCALL_NOT_PRESENT_GEN(sched_setparam)
137 SYSCALL_NOT_PRESENT_GEN(sched_getparam)
138 SYSCALL_NOT_PRESENT_GEN(sched_setscheduler)
139 SYSCALL_NOT_PRESENT_GEN(sched_getscheduler)
140 SYSCALL_NOT_PRESENT_GEN(sched_yield)
141 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_max)
142 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_min)
143 SYSCALL_NOT_PRESENT_GEN(sched_rr_get_interval)
147 /* Configured in kernel version:
149 static struct ksched *ksched;
151 static int sched_attach(void)
153 int ret = ksched_attach(&ksched);
156 p31b_setcfg(CTL_P1003_1B_PRIORITY_SCHEDULING, 1);
161 int sched_setparam(struct proc *p,
162 struct sched_setparam_args *uap)
166 struct sched_param sched_param;
167 copyin(uap->param, &sched_param, sizeof(sched_param));
170 || (e = p31b_proc(p, uap->pid, &p))
171 || (e = ksched_setparam(&p->p_retval[0], ksched, p,
172 (const struct sched_param *)&sched_param))
178 int sched_getparam(struct proc *p,
179 struct sched_getparam_args *uap)
181 struct proc *targetp;
182 struct sched_param sched_param;
185 if (uap->pid != 0 && uap->pid != p->p_pid) {
186 e = p31b_proc(p, uap->pid, &targetp);
192 e = ksched_getparam(&p->p_retval[0], ksched, targetp, &sched_param);
195 copyout(&sched_param, uap->param, sizeof(sched_param));
199 int sched_setscheduler(struct proc *p,
200 struct sched_setscheduler_args *uap)
204 struct sched_param sched_param;
205 copyin(uap->param, &sched_param, sizeof(sched_param));
208 || (e = p31b_proc(p, uap->pid, &p))
209 || (e = ksched_setscheduler(&p->p_retval[0],
210 ksched, p, uap->policy,
211 (const struct sched_param *)&sched_param))
216 int sched_getscheduler(struct proc *p,
217 struct sched_getscheduler_args *uap)
219 struct proc *targetp;
222 if (uap->pid != 0 && uap->pid != p->p_pid) {
223 e = p31b_proc(p, uap->pid, &targetp);
229 e = ksched_getscheduler(&p->p_retval[0], ksched, targetp);
233 int sched_yield(struct proc *p,
234 struct sched_yield_args *uap)
236 return ksched_yield(&p->p_retval[0], ksched);
238 int sched_get_priority_max(struct proc *p,
239 struct sched_get_priority_max_args *uap)
241 return ksched_get_priority_max(&p->p_retval[0],
242 ksched, uap->policy);
244 int sched_get_priority_min(struct proc *p,
245 struct sched_get_priority_min_args *uap)
247 return ksched_get_priority_min(&p->p_retval[0],
248 ksched, uap->policy);
250 int sched_rr_get_interval(struct proc *p,
251 struct sched_rr_get_interval_args *uap)
256 || (e = p31b_proc(p, uap->pid, &p))
257 || (e = ksched_rr_get_interval(&p->p_retval[0], ksched,
266 static void p31binit(void *notused)
268 (void) sched_attach();
269 p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE);
272 SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL);