Finish _POSIX_PRIORITY_SCHEDULING. Needs P1003_1B and

_KPOSIX_PRIORITY_SCHEDULING options to work.  Changes:

Change all "posix4" to "p1003_1b".  Misnamed files are left
as "posix4" until I'm told if I can simply delete them and add
new ones;

Add _POSIX_PRIORITY_SCHEDULING system calls for FreeBSD and Linux;

Add man pages for _POSIX_PRIORITY_SCHEDULING system calls;

Add options to LINT;

Minor fixes to P1003_1B code during testing.

1 files changed, 239 insertions, 0 deletions

diff --git a/sys/posix4/p1003_1b.c b/sys/posix4/p1003_1b.c
new file mode 100644
index 000000000000..ccbee6b80283
--- /dev/null
+++ b/sys/posix4/p1003_1b.c
@@ -0,0 +1,239 @@
+/*
+ * Copyright (c) 1996, 1997, 1998
+ *	HD Associates, Inc.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by HD Associates, Inc
+ * 4. Neither the name of the author nor the names of any co-contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+
+/* p1003_1b: Real Time common code.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/sysent.h>
+#include <sys/proc.h>
+#include <sys/syslog.h>
+#include <sys/module.h>
+#include <sys/sysproto.h>
+#include <sys/sysctl.h>
+
+#include <posix4/posix4.h>
+
+MALLOC_DEFINE(M_P31B, "p1003.1b", "Posix 1003.1B");
+
+/* p31b_proc: Return a proc struct corresponding to a pid to operate on.
+ *
+ * Enforce permission policy.
+ *
+ * The policy is the same as for sending signals except there
+ * is no notion of process groups.
+ *
+ * pid == 0 means my process.
+ *
+ * This is disabled until I've got a permission gate in again:
+ * only root can do this.
+ */
+
+#if 0
+/*
+ * This is stolen from CANSIGNAL in kern_sig:
+ *
+ * Can process p, with pcred pc, do "write flavor" operations to process q?
+ */
+#define CAN_AFFECT(p, pc, q) \
+	((pc)->pc_ucred->cr_uid == 0 || \
+	    (pc)->p_ruid == (q)->p_cred->p_ruid || \
+	    (pc)->pc_ucred->cr_uid == (q)->p_cred->p_ruid || \
+	    (pc)->p_ruid == (q)->p_ucred->cr_uid || \
+	    (pc)->pc_ucred->cr_uid == (q)->p_ucred->cr_uid)
+#else
+#define CAN_AFFECT(p, pc, q) ((pc)->pc_ucred->cr_uid == 0)
+#endif
+
+/*
+ * p31b_proc: Look up a proc from a PID.  If proc is 0 it is
+ * my own proc.
+ */
+int p31b_proc(struct proc *p, pid_t pid, struct proc **pp)
+{
+	int ret = 0;
+	struct proc *other_proc = 0;
+
+	if (pid == 0)
+		other_proc = p;
+	else
+		other_proc = pfind(pid);
+
+	if (other_proc)
+	{
+		/* Enforce permission policy.
+		 */
+		if (CAN_AFFECT(p, p->p_cred, other_proc))
+			*pp = other_proc;
+		else
+			ret = EPERM;
+	}
+	else
+		ret = ESRCH;
+
+	return ret;
+}
+
+int
+syscall_not_present(struct proc *p, const char *s, struct nosys_args *uap)
+{
+	log(LOG_ERR, "cmd %s pid %d tried to use non-present %s\n",
+			p->p_comm, p->p_pid, s);
+	return nosys(p, uap);
+}
+
+#if !defined(_KPOSIX_PRIORITY_SCHEDULING)
+
+/* Not configured but loadable via an LKM:
+ */
+
+static int sched_attach(void)
+{
+	return 0;
+}
+
+SYSCALL_NOT_PRESENT_GEN(sched_setparam)
+SYSCALL_NOT_PRESENT_GEN(sched_getparam)
+SYSCALL_NOT_PRESENT_GEN(sched_setscheduler)
+SYSCALL_NOT_PRESENT_GEN(sched_getscheduler)
+SYSCALL_NOT_PRESENT_GEN(sched_yield)
+SYSCALL_NOT_PRESENT_GEN(sched_get_priority_max)
+SYSCALL_NOT_PRESENT_GEN(sched_get_priority_min)
+SYSCALL_NOT_PRESENT_GEN(sched_rr_get_interval)
+
+#else
+
+/* Configured in kernel version:
+ */
+static struct ksched *ksched;
+
+static int sched_attach(void)
+{
+	int ret = ksched_attach(&ksched);
+
+	if (ret == 0)
+		p31b_setcfg(CTL_P1003_1B_PRIORITY_SCHEDULING, 1);
+
+	return ret;
+}
+
+int sched_setparam(struct proc *p,
+	struct sched_setparam_args *uap)
+{
+	int e;
+
+	(void) (0
+	|| (e = p31b_proc(p, uap->pid, &p))
+	|| (e = ksched_setparam(&p->p_retval[0], ksched, p,
+	(const struct sched_param *) &uap->param))
+	);
+
+	return e;
+}
+
+int sched_getparam(struct proc *p,
+	struct sched_getparam_args *uap)
+{
+	int e;
+
+	(void) (0
+	|| (e = p31b_proc(p, uap->pid, &p))
+	|| (e = ksched_getparam(&p->p_retval[0], ksched, p, uap->param))
+	);
+
+	return e;
+}
+int sched_setscheduler(struct proc *p,
+	struct sched_setscheduler_args *uap)
+{
+	int e;
+	(void) (0
+	|| (e = p31b_proc(p, uap->pid, &p))
+	|| (e = ksched_setscheduler(&p->p_retval[0],
+	ksched, p, uap->policy, uap->param))
+	);
+
+	return e;
+}
+int sched_getscheduler(struct proc *p,
+	struct sched_getscheduler_args *uap)
+{
+	int e;
+	(void) (0
+	|| (e = p31b_proc(p, uap->pid, &p))
+	|| (e = ksched_getscheduler(&p->p_retval[0], ksched, p))
+	);
+
+	return e;
+}
+int sched_yield(struct proc *p,
+	struct sched_yield_args *uap)
+{
+	return ksched_yield(&p->p_retval[0], ksched);
+}
+int sched_get_priority_max(struct proc *p,
+	struct sched_get_priority_max_args *uap)
+{
+	return ksched_get_priority_max(&p->p_retval[0],
+	ksched, uap->policy);
+}
+int sched_get_priority_min(struct proc *p,
+	struct sched_get_priority_min_args *uap)
+{
+	return ksched_get_priority_min(&p->p_retval[0],
+	ksched, uap->policy);
+}
+int sched_rr_get_interval(struct proc *p,
+	struct sched_rr_get_interval_args *uap)
+{
+	int e;
+
+	(void) (0
+	|| (e = p31b_proc(p, uap->pid, &p))
+	|| (e = ksched_rr_get_interval(&p->p_retval[0], ksched,
+	p, uap->interval))
+	);
+
+	return e;
+}
+
+#endif
+
+static void p31binit(void *notused)
+{
+	(void) sched_attach();
+}
+
+SYSINIT(p31b, SI_SUB_P1003_1B, SI_ORDER_FIRST, p31binit, NULL);