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Diffstat (limited to 'sys/posix4/p1003_1b.c')
| -rw-r--r-- | sys/posix4/p1003_1b.c | 239 |
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); |