079b7badea
this is a low-functionality change that changes the kernel to access the main thread of a process via the linked list of threads rather than assuming that it is embedded in the process. It IS still embeded there but remove all teh code that assumes that in preparation for the next commit which will actually move it out. Reviewed by: peter@freebsd.org, gallatin@cs.duke.edu, benno rice,
135 lines
3.4 KiB
C
135 lines
3.4 KiB
C
/*-
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* Copyright (c) 2001 Dag-Erling Coïdan Smørgrav
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/pioctl.h>
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#include <sys/proc.h>
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#include <sys/signalvar.h>
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#include <sys/systm.h>
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#include <fs/pseudofs/pseudofs.h>
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#include <fs/procfs/procfs.h>
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/*
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* Process ioctls
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*/
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int
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procfs_ioctl(PFS_IOCTL_ARGS)
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{
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struct procfs_status *ps;
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int error, flags, sig;
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PROC_LOCK(p);
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error = 0;
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switch (cmd) {
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case PIOCBIS:
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p->p_stops |= *(unsigned int *)data;
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break;
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case PIOCBIC:
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p->p_stops &= ~*(unsigned int *)data;
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break;
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case PIOCSFL:
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flags = *(unsigned int *)data;
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if (flags & PF_ISUGID && (error = suser(td->td_proc)) != 0)
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break;
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p->p_pfsflags = flags;
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break;
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case PIOCGFL:
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*(unsigned int *)data = p->p_pfsflags;
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break;
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case PIOCWAIT:
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while (p->p_step == 0) {
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/* sleep until p stops */
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error = msleep(&p->p_stype, &p->p_mtx,
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PWAIT|PCATCH, "pioctl", 0);
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if (error != 0)
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break;
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}
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/* fall through to PIOCSTATUS */
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case PIOCSTATUS:
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ps = (struct procfs_status *)data;
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ps->state = (p->p_step == 0);
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ps->flags = 0; /* nope */
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ps->events = p->p_stops;
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ps->why = p->p_step ? p->p_stype : 0;
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ps->val = p->p_step ? p->p_xstat : 0;
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break;
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case PIOCCONT:
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if (p->p_step == 0)
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break;
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sig = *(int *)data;
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if (sig != 0 && !_SIG_VALID(sig)) {
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error = EINVAL;
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break;
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}
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#if 0
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mtx_lock_spin(&sched_lock);
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p->p_step = 0;
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if (p->p_stat == SSTOP) {
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p->p_xstat = sig;
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setrunnable(FIRST_THREAD_IN_PROC(p));
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mtx_unlock_spin(&sched_lock);
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} else {
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mtx_unlock_spin(&sched_lock);
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if (sig)
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psignal(p, sig);
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}
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#else
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if (sig)
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psignal(p, sig);
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p->p_step = 0;
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wakeup(&p->p_step);
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#endif
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break;
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default:
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error = (ENOTTY);
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}
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PROC_UNLOCK(p);
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return (error);
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}
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/*
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* Clean up on last close
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*/
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int
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procfs_close(PFS_CLOSE_ARGS)
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{
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if (p != NULL && (p->p_pfsflags & PF_LINGER) == 0) {
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p->p_pfsflags = 0;
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p->p_stops = 0;
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p->p_step = 0;
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wakeup(&p->p_step);
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}
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return (0);
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}
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