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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 #include <sys/mplock2.h>
52 MALLOC_DEFINE(M_P31B, "p1003.1b", "Posix 1003.1B");
54 /* p31b_proc: Return a proc struct corresponding to a pid to operate on.
56 * Enforce permission policy.
58 * The policy is the same as for sending signals except there
59 * is no notion of process groups.
61 * pid == 0 means my process.
63 * This is disabled until I've got a permission gate in again:
64 * only root can do this.
69 * This is stolen from CANSIGNAL in kern_sig:
71 * Can process p, with pcred pc, do "write flavor" operations to process q?
73 #define CAN_AFFECT(p, cr, q) \
74 ((cr)->cr_uid == 0 || \
75 (cr)->cr_ruid == (q)->p_ucred->cr_ruid || \
76 (cr)->cr_uid == (q)->p_ucred->cr_ruid || \
77 (cr)->cr_ruid == (q)->p_ucred->cr_uid || \
78 (cr)->cr_uid == (q)->p_ucred->cr_uid)
80 #define CAN_AFFECT(p, cr, q) ((cr)->cr_uid == 0)
84 * p31b_proc: Look up a proc from a PID. If proc is 0 it is
87 int p31b_proc(struct proc *p, pid_t pid, struct proc **pp)
90 struct proc *other_proc = NULL;
97 other_proc = pfind(pid);
98 /* ref from pfind() */
102 /* Enforce permission policy.
104 if (CAN_AFFECT(p, p->p_ucred, other_proc))
117 #if !defined(_KPOSIX_PRIORITY_SCHEDULING)
119 int syscall_not_present(const char *s);
121 /* The system calls return ENOSYS if an entry is called that is
122 * not run-time supported. I am also logging since some programs
123 * start to use this when they shouldn't. That will be removed if annoying.
125 int syscall_not_present(const char *s)
127 struct proc *p = curproc;
128 log(LOG_ERR, "cmd %s pid %d tried to use non-present %s\n",
129 p->p_comm, p->p_pid, s);
131 /* a " return nosys(p, uap); " here causes a core dump.
137 /* Not configured but loadable via a module:
140 static int sched_attach(void)
145 #define SYSCALL_NOT_PRESENT_GEN(SC) \
146 int sys_##SC (struct SC##_args *uap) \
148 return syscall_not_present(#SC); \
151 SYSCALL_NOT_PRESENT_GEN(sched_setparam)
152 SYSCALL_NOT_PRESENT_GEN(sched_getparam)
153 SYSCALL_NOT_PRESENT_GEN(sched_setscheduler)
154 SYSCALL_NOT_PRESENT_GEN(sched_getscheduler)
155 SYSCALL_NOT_PRESENT_GEN(sched_yield)
156 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_max)
157 SYSCALL_NOT_PRESENT_GEN(sched_get_priority_min)
158 SYSCALL_NOT_PRESENT_GEN(sched_rr_get_interval)
162 /* Configured in kernel version:
164 static struct ksched *ksched;
166 static int sched_attach(void)
168 int ret = ksched_attach(&ksched);
171 p31b_setcfg(CTL_P1003_1B_PRIORITY_SCHEDULING, 1);
180 sys_sched_setparam(struct sched_setparam_args *uap)
182 struct proc *p = curproc;
185 struct sched_param sched_param;
187 copyin(uap->param, &sched_param, sizeof(sched_param));
190 if ((e = p31b_proc(p, uap->pid, &p)) == 0) {
191 lp = FIRST_LWP_IN_PROC(p); /* XXX lwp */
192 e = ksched_setparam(&uap->sysmsg_reg, ksched, lp,
193 (const struct sched_param *)&sched_param);
203 sys_sched_getparam(struct sched_getparam_args *uap)
205 struct proc *p = curproc;
206 struct proc *targetp;
208 struct sched_param sched_param;
212 if (uap->pid != 0 && uap->pid != p->p_pid) {
213 e = p31b_proc(p, uap->pid, &targetp);
220 lp = FIRST_LWP_IN_PROC(targetp); /* XXX lwp */
221 e = ksched_getparam(&uap->sysmsg_reg, ksched, lp, &sched_param);
225 copyout(&sched_param, uap->param, sizeof(sched_param));
233 sys_sched_setscheduler(struct sched_setscheduler_args *uap)
235 struct proc *p = curproc;
238 struct sched_param sched_param;
240 copyin(uap->param, &sched_param, sizeof(sched_param));
243 if ((e = p31b_proc(p, uap->pid, &p)) == 0) {
244 lp = FIRST_LWP_IN_PROC(p); /* XXX lwp */
245 e = ksched_setscheduler(&uap->sysmsg_reg, ksched, lp,
247 (const struct sched_param *)&sched_param);
257 sys_sched_getscheduler(struct sched_getscheduler_args *uap)
259 struct proc *p = curproc;
260 struct proc *targetp;
265 if (uap->pid != 0 && uap->pid != p->p_pid) {
266 e = p31b_proc(p, uap->pid, &targetp);
273 lp = FIRST_LWP_IN_PROC(targetp); /* XXX lwp */
274 e = ksched_getscheduler(&uap->sysmsg_reg, ksched, lp);
284 sys_sched_yield(struct sched_yield_args *uap)
286 return ksched_yield(&uap->sysmsg_reg, ksched);
293 sys_sched_get_priority_max(struct sched_get_priority_max_args *uap)
295 return ksched_get_priority_max(&uap->sysmsg_reg, ksched, uap->policy);
302 sys_sched_get_priority_min(struct sched_get_priority_min_args *uap)
304 return ksched_get_priority_min(&uap->sysmsg_reg, ksched, uap->policy);
311 sys_sched_rr_get_interval(struct sched_rr_get_interval_args *uap)
314 struct proc *p = curproc;
315 struct lwp *lp = curthread->td_lwp;
319 if ((e = p31b_proc(p, uap->pid, &p)) == 0) {
320 e = ksched_rr_get_interval(&uap->sysmsg_reg, ksched, lp, &ts);
322 e = copyout(&ts, uap->interval, sizeof(ts));
331 p31binit(void *notused)
333 (void) sched_attach();
334 p31b_setcfg(CTL_P1003_1B_PAGESIZE, PAGE_SIZE);
335 p31b_setcfg(CTL_P1003_1B_ASYNCHRONOUS_IO, -1);
336 p31b_setcfg(CTL_P1003_1B_MESSAGE_PASSING, _POSIX_MESSAGE_PASSING);
339 SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL);