310086415a
This prevents a more mysterious crash later. XXX The long term solution is defer creation of these things until XXX proc0 lives
145 lines
3.8 KiB
C
145 lines
3.8 KiB
C
/*
|
|
* Copyright (c) 1999 Peter Wemm <peter@FreeBSD.org>
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 THE AUTHOR 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/kthread.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/signalvar.h>
|
|
#include <sys/unistd.h>
|
|
#include <sys/wait.h>
|
|
|
|
#include <machine/stdarg.h>
|
|
|
|
/*
|
|
* Start a kernel process. This is called after a fork() call in
|
|
* mi_startup() in the file kern/init_main.c.
|
|
*
|
|
* This function is used to start "internal" daemons and intended
|
|
* to be called from SYSINIT().
|
|
*/
|
|
void
|
|
kproc_start(udata)
|
|
const void *udata;
|
|
{
|
|
const struct kproc_desc *kp = udata;
|
|
int error;
|
|
|
|
error = kthread_create((void (*)(void *))kp->func, NULL,
|
|
kp->global_procpp, kp->arg0);
|
|
if (error)
|
|
panic("kproc_start: %s: error %d", kp->arg0, error);
|
|
}
|
|
|
|
/*
|
|
* Create a kernel process/thread/whatever. It shares it's address space
|
|
* with proc0 - ie: kernel only.
|
|
*/
|
|
int
|
|
kthread_create(void (*func)(void *), void *arg,
|
|
struct proc **newpp, const char *fmt, ...)
|
|
{
|
|
int error;
|
|
va_list ap;
|
|
struct proc *p2;
|
|
|
|
if (!proc0.p_stats || proc0.p_stats->p_start.tv_sec == 0) {
|
|
panic("kthread_create called too soon");
|
|
}
|
|
|
|
error = fork1(&proc0, RFMEM | RFFDG | RFPROC, &p2);
|
|
if (error)
|
|
return error;
|
|
|
|
/* save a global descriptor, if desired */
|
|
if (newpp != NULL)
|
|
*newpp = p2;
|
|
|
|
/* this is a non-swapped system process */
|
|
p2->p_flag |= P_INMEM | P_SYSTEM;
|
|
p2->p_procsig->ps_flag |= PS_NOCLDWAIT;
|
|
PHOLD(p2);
|
|
|
|
/* set up arg0 for 'ps', et al */
|
|
va_start(ap, fmt);
|
|
vsnprintf(p2->p_comm, sizeof(p2->p_comm), fmt, ap);
|
|
va_end(ap);
|
|
|
|
/* call the processes' main()... */
|
|
cpu_set_fork_handler(p2, func, arg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
kthread_exit(int ecode)
|
|
{
|
|
exit1(curproc, W_EXITCODE(ecode, 0));
|
|
}
|
|
|
|
/*
|
|
* Advise a kernel process to suspend (or resume) in its main loop.
|
|
* Participation is voluntary.
|
|
*/
|
|
int
|
|
suspend_kproc(struct proc *p, int timo)
|
|
{
|
|
/*
|
|
* Make sure this is indeed a system process and we can safely
|
|
* use the p_siglist field.
|
|
*/
|
|
if ((p->p_flag & P_SYSTEM) == 0)
|
|
return (EINVAL);
|
|
SIGADDSET(p->p_siglist, SIGSTOP);
|
|
return tsleep((caddr_t)&p->p_siglist, PPAUSE, "suspkp", timo);
|
|
}
|
|
|
|
int
|
|
resume_kproc(struct proc *p)
|
|
{
|
|
/*
|
|
* Make sure this is indeed a system process and we can safely
|
|
* use the p_siglist field.
|
|
*/
|
|
if ((p->p_flag & P_SYSTEM) == 0)
|
|
return (EINVAL);
|
|
SIGDELSET(p->p_siglist, SIGSTOP);
|
|
wakeup((caddr_t)&p->p_siglist);
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
kproc_suspend_loop(struct proc *p)
|
|
{
|
|
while (SIGISMEMBER(p->p_siglist, SIGSTOP)) {
|
|
wakeup((caddr_t)&p->p_siglist);
|
|
tsleep((caddr_t)&p->p_siglist, PPAUSE, "kpsusp", 0);
|
|
}
|
|
}
|