[dragonfly.git] / sys / vfs / procfs / procfs_ctl.c

/*
 * Copyright (c) 1993 Jan-Simon Pendry
 * Copyright (c) 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Jan-Simon Pendry.
 *
 * 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 the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 *	@(#)procfs_ctl.c	8.4 (Berkeley) 6/15/94
 *
 * From:
 * $FreeBSD: src/sys/miscfs/procfs/procfs_ctl.c,v 1.20.2.2 2002/01/22 17:22:59 nectar Exp $
 * $DragonFly: src/sys/vfs/procfs/procfs_ctl.c,v 1.16 2007/03/12 21:08:15 corecode Exp $
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/priv.h>
#include <sys/vnode.h>
#include <sys/ptrace.h>
#include <sys/signalvar.h>
#include <vfs/procfs/procfs.h>

#include <sys/signal2.h>
#include <sys/thread2.h>
#include <sys/mplock2.h>
#include <sys/spinlock2.h>

#include <vm/vm.h>

#ifndef FIX_SSTEP
#define FIX_SSTEP(lp)
#endif

/*
 * True iff process (p) is in trace wait state
 * relative to process (curp)
 */
#define TRACE_WAIT_P(curp, p) \
	(((p)->p_stat == SSTOP) && \
	 (p)->p_pptr == (curp) && \
	 ((p)->p_flags & P_TRACED))

#define PROCFS_CTL_ATTACH	1
#define PROCFS_CTL_DETACH	2
#define PROCFS_CTL_STEP		3
#define PROCFS_CTL_RUN		4
#define PROCFS_CTL_WAIT		5

static vfs_namemap_t ctlnames[] = {
	/* special /proc commands */
	{ "attach",	PROCFS_CTL_ATTACH },
	{ "detach",	PROCFS_CTL_DETACH },
	{ "step",	PROCFS_CTL_STEP },
	{ "run",	PROCFS_CTL_RUN },
	{ "wait",	PROCFS_CTL_WAIT },
	{ 0 },
};

static vfs_namemap_t signames[] = {
	/* regular signal names */
	{ "hup",	SIGHUP },	{ "int",	SIGINT },
	{ "quit",	SIGQUIT },	{ "ill",	SIGILL },
	{ "trap",	SIGTRAP },	{ "abrt",	SIGABRT },
	{ "iot",	SIGIOT },	{ "emt",	SIGEMT },
	{ "fpe",	SIGFPE },	{ "kill",	SIGKILL },
	{ "bus",	SIGBUS },	{ "segv",	SIGSEGV },
	{ "sys",	SIGSYS },	{ "pipe",	SIGPIPE },
	{ "alrm",	SIGALRM },	{ "term",	SIGTERM },
	{ "urg",	SIGURG },	{ "stop",	SIGSTOP },
	{ "tstp",	SIGTSTP },	{ "cont",	SIGCONT },
	{ "chld",	SIGCHLD },	{ "ttin",	SIGTTIN },
	{ "ttou",	SIGTTOU },	{ "io",		SIGIO },
	{ "xcpu",	SIGXCPU },	{ "xfsz",	SIGXFSZ },
	{ "vtalrm",	SIGVTALRM },	{ "prof",	SIGPROF },
	{ "winch",	SIGWINCH },	{ "info",	SIGINFO },
	{ "usr1",	SIGUSR1 },	{ "usr2",	SIGUSR2 },
	{ 0 },
};

static int	procfs_control (struct proc *curp, struct lwp *lp, int op);

static int
procfs_control(struct proc *curp, struct lwp *lp, int op)
{
	struct proc *p = lp->lwp_proc;
	int error;

	ASSERT_LWKT_TOKEN_HELD(&p->p_token);
	ASSERT_LWKT_TOKEN_HELD(&proc_token);

	/* Can't trace a process that's currently exec'ing. */ 
	if ((p->p_flags & P_INEXEC) != 0)
		return EAGAIN;
	/*
	 * Authorization check: rely on normal debugging protection, except
	 * allow processes to disengage debugging on a process onto which
	 * they have previously attached, but no longer have permission to
	 * debug.
	 */
	if (op != PROCFS_CTL_DETACH) {
		if (securelevel > 0 && p->p_pid == 1)
			return (EPERM);

		if (!CHECKIO(curp, p) || p_trespass(curp->p_ucred, p->p_ucred))
			return (EPERM);
	}

	/*
	 * Attach - attaches the target process for debugging
	 * by the calling process.
	 */
	if (op == PROCFS_CTL_ATTACH) {
		/* check whether already being traced */
		if (p->p_flags & P_TRACED)
			return (EBUSY);

		/* can't trace yourself! */
		if (p->p_pid == curp->p_pid)
			return (EINVAL);

		/*
		 * Go ahead and set the trace flag.
		 * Save the old parent (it's reset in
		 *   _DETACH, and also in kern_exit.c:wait4()
		 * Reparent the process so that the tracing
		 *   proc gets to see all the action.
		 * Stop the target.
		 */
		p->p_flags |= P_TRACED;
		faultin(p);
		p->p_xstat = 0;		/* XXX ? */
		if (p->p_pptr != curp) {
			p->p_oppid = p->p_pptr->p_pid;
			proc_reparent(p, curp);
		}
		proc_stop(p);
		return (0);
	}

	/*
	 * Target process must be stopped, owned by (curp) and
	 * be set up for tracing (P_TRACED flag set).
	 * Allow DETACH to take place at any time for sanity.
	 * Allow WAIT any time, of course.
	 */
	switch (op) {
	case PROCFS_CTL_DETACH:
	case PROCFS_CTL_WAIT:
		break;

	default:
		if (!TRACE_WAIT_P(curp, p))
			return (EBUSY);
	}


#ifdef FIX_SSTEP
	/*
	 * do single-step fixup if needed
	 */
	FIX_SSTEP(lp);
#endif

	/*
	 * Don't deliver any signal by default.
	 * To continue with a signal, just send
	 * the signal name to the ctl file
	 */
	p->p_xstat = 0;

	switch (op) {
	/*
	 * Detach.  Cleans up the target process, reparent it if possible
	 * and set it running once more.
	 */
	case PROCFS_CTL_DETACH:
		/* if not being traced, then this is a painless no-op */
		if ((p->p_flags & P_TRACED) == 0)
			return (0);

		/* not being traced any more */
		p->p_flags &= ~P_TRACED;

		/* remove pending SIGTRAP, else the process will die */
		spin_lock(&lp->lwp_spin);
		lwp_delsig(lp, SIGTRAP);
		spin_unlock(&lp->lwp_spin);

		/* give process back to original parent */
		if (p->p_oppid != p->p_pptr->p_pid) {
			struct proc *pp;

			pp = pfind(p->p_oppid);
			if (pp) {
				proc_reparent(p, pp);
				PRELE(pp);
			}
		}

		p->p_oppid = 0;
		p->p_flags &= ~P_WAITED;	/* XXX ? */
		wakeup((caddr_t) curp);		/* XXX for CTL_WAIT below ? */

		break;

	/*
	 * Step.  Let the target process execute a single instruction.
	 */
	case PROCFS_CTL_STEP:
		LWPHOLD(lp);
		error = procfs_sstep(lp);
		LWPRELE(lp);
		if (error)
			return (error);
		break;

	/*
	 * Run.  Let the target process continue running until a breakpoint
	 * or some other trap.
	 */
	case PROCFS_CTL_RUN:
		break;

	/*
	 * Wait for the target process to stop.
	 * If the target is not being traced then just wait
	 * to enter
	 */
	case PROCFS_CTL_WAIT:
		error = 0;
		if (p->p_flags & P_TRACED) {
			while (error == 0 &&
					p->p_stat != SSTOP &&
					(p->p_flags & P_TRACED) &&
					(p->p_pptr == curp)) {
				error = tsleep((caddr_t) p,
						PCATCH, "procfsx", 0);
			}
			if (error == 0 && !TRACE_WAIT_P(curp, p))
				error = EBUSY;
		} else {
			while (error == 0 && p->p_stat != SSTOP) {
				error = tsleep((caddr_t) p,
						PCATCH, "procfs", 0);
			}
		}
		return (error);

	default:
		panic("procfs_control");
	}

	/*
	 * If the process is in a stopped state, make it runnable again.
	 * Do not set LWP_MP_BREAKTSLEEP - that is, do not break a tsleep
	 * that might be in progress.
	 */
	if (p->p_stat == SSTOP)
		proc_unstop(p);
	return (0);
}

int
procfs_doctl(struct proc *curp, struct lwp *lp, struct pfsnode *pfs,
	     struct uio *uio)
{
	struct proc *p = lp->lwp_proc;
	int xlen;
	int error;
	char msg[PROCFS_CTLLEN+1];
	vfs_namemap_t *nm;

	ASSERT_LWKT_TOKEN_HELD(&p->p_token);
	ASSERT_LWKT_TOKEN_HELD(&proc_token);

	if (uio->uio_rw != UIO_WRITE)
		return (EOPNOTSUPP);

	xlen = PROCFS_CTLLEN;
	error = vfs_getuserstr(uio, msg, &xlen);
	if (error)
		return (error);

	/*
	 * Map signal names into signal generation
	 * or debug control.  Unknown commands and/or signals
	 * return EOPNOTSUPP.
	 *
	 * Sending a signal while the process is being debugged
	 * also has the side effect of letting the target continue
	 * to run.  There is no way to single-step a signal delivery.
	 */
	error = EOPNOTSUPP;

	nm = vfs_findname(ctlnames, msg, xlen);
	if (nm) {
		error = procfs_control(curp, lp, nm->nm_val);
	} else {
		nm = vfs_findname(signames, msg, xlen);
		if (nm) {
			if (TRACE_WAIT_P(curp, p)) {
				p->p_xstat = nm->nm_val;
#ifdef FIX_SSTEP
				FIX_SSTEP(lp);
#endif
				/*
				 * Make the process runnable but do not
				 * break its tsleep.
				 */
				proc_unstop(p);
			} else {
				ksignal(p, nm->nm_val);
			}
			error = 0;
		}
	}

	return (error);
}
Commit	Line	Data
984263bc MD	1	/*
	2	* Copyright (c) 1993 Jan-Simon Pendry
	3	* Copyright (c) 1993
	4	* The Regents of the University of California. All rights reserved.
	5	*
	6	* This code is derived from software contributed to Berkeley by
	7	* Jan-Simon Pendry.
	8	*
	9	* Redistribution and use in source and binary forms, with or without
	10	* modification, are permitted provided that the following conditions
	11	* are met:
	12	* 1. Redistributions of source code must retain the above copyright
	13	* notice, this list of conditions and the following disclaimer.
	14	* 2. Redistributions in binary form must reproduce the above copyright
	15	* notice, this list of conditions and the following disclaimer in the
	16	* documentation and/or other materials provided with the distribution.
	17	* 3. All advertising materials mentioning features or use of this software
	18	* must display the following acknowledgement:
	19	* This product includes software developed by the University of
	20	* California, Berkeley and its contributors.
	21	* 4. Neither the name of the University nor the names of its contributors
	22	* may be used to endorse or promote products derived from this software
	23	* without specific prior written permission.
	24	*
	25	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	26	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	27	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	28	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	29	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	30	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	31	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	32	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	33	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	34	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	35	* SUCH DAMAGE.
	36	*
	37	* @(#)procfs_ctl.c 8.4 (Berkeley) 6/15/94
	38	*
	39	* From:
	40	* $FreeBSD: src/sys/miscfs/procfs/procfs_ctl.c,v 1.20.2.2 2002/01/22 17:22:59 nectar Exp $
f33e8653	41	* $DragonFly: src/sys/vfs/procfs/procfs_ctl.c,v 1.16 2007/03/12 21:08:15 corecode Exp $
984263bc MD	42	*/
	43
	44	#include <sys/param.h>
	45	#include <sys/systm.h>
	46	#include <sys/proc.h>
75bda2d9	47	#include <sys/priv.h>
984263bc MD	48	#include <sys/vnode.h>
	49	#include <sys/ptrace.h>
	50	#include <sys/signalvar.h>
1f2de5d4	51	#include <vfs/procfs/procfs.h>
984263bc	52
b5d16701 MD	53	#include <sys/signal2.h>
	54	#include <sys/thread2.h>
	55	#include <sys/mplock2.h>
94f98873	56	#include <sys/spinlock2.h>
b5d16701	57
984263bc MD	58	#include <vm/vm.h>
	59
	60	#ifndef FIX_SSTEP
c7e98b2f	61	#define FIX_SSTEP(lp)
984263bc MD	62	#endif
	63
	64	/*
	65	* True iff process (p) is in trace wait state
	66	* relative to process (curp)
	67	*/
	68	#define TRACE_WAIT_P(curp, p) \
164b8401	69	(((p)->p_stat == SSTOP) && \
984263bc	70	(p)->p_pptr == (curp) && \
4643740a	71	((p)->p_flags & P_TRACED))
984263bc MD	72
	73	#define PROCFS_CTL_ATTACH 1
	74	#define PROCFS_CTL_DETACH 2
	75	#define PROCFS_CTL_STEP 3
	76	#define PROCFS_CTL_RUN 4
	77	#define PROCFS_CTL_WAIT 5
	78
	79	static vfs_namemap_t ctlnames[] = {
	80	/* special /proc commands */
	81	{ "attach", PROCFS_CTL_ATTACH },
	82	{ "detach", PROCFS_CTL_DETACH },
	83	{ "step", PROCFS_CTL_STEP },
	84	{ "run", PROCFS_CTL_RUN },
	85	{ "wait", PROCFS_CTL_WAIT },
	86	{ 0 },
	87	};
	88
	89	static vfs_namemap_t signames[] = {
	90	/* regular signal names */
	91	{ "hup", SIGHUP }, { "int", SIGINT },
	92	{ "quit", SIGQUIT }, { "ill", SIGILL },
	93	{ "trap", SIGTRAP }, { "abrt", SIGABRT },
	94	{ "iot", SIGIOT }, { "emt", SIGEMT },
	95	{ "fpe", SIGFPE }, { "kill", SIGKILL },
	96	{ "bus", SIGBUS }, { "segv", SIGSEGV },
	97	{ "sys", SIGSYS }, { "pipe", SIGPIPE },
	98	{ "alrm", SIGALRM }, { "term", SIGTERM },
	99	{ "urg", SIGURG }, { "stop", SIGSTOP },
	100	{ "tstp", SIGTSTP }, { "cont", SIGCONT },
	101	{ "chld", SIGCHLD }, { "ttin", SIGTTIN },
	102	{ "ttou", SIGTTOU }, { "io", SIGIO },
	103	{ "xcpu", SIGXCPU }, { "xfsz", SIGXFSZ },
	104	{ "vtalrm", SIGVTALRM }, { "prof", SIGPROF },
	105	{ "winch", SIGWINCH }, { "info", SIGINFO },
	106	{ "usr1", SIGUSR1 }, { "usr2", SIGUSR2 },
	107	{ 0 },
	108	};
	109
c7e98b2f	110	static int procfs_control (struct proc curp, struct lwp lp, int op);
984263bc MD	111
984263bc MD	112	static int
c7e98b2f	113	procfs_control(struct proc curp, struct lwp lp, int op)
984263bc	114	{
c7e98b2f	115	struct proc *p = lp->lwp_proc;
984263bc MD	116	int error;
984263bc MD	117
5686ec5a	118	ASSERT_LWKT_TOKEN_HELD(&p->p_token);
98c2b8ac MD	119	ASSERT_LWKT_TOKEN_HELD(&proc_token);
98c2b8ac MD	120
984263bc	121	/* Can't trace a process that's currently exec'ing. */
4643740a	122	if ((p->p_flags & P_INEXEC) != 0)
984263bc MD	123	return EAGAIN;
	124	/*
	125	* Authorization check: rely on normal debugging protection, except
	126	* allow processes to disengage debugging on a process onto which
	127	* they have previously attached, but no longer have permission to
	128	* debug.
	129	*/
	130	if (op != PROCFS_CTL_DETACH) {
	131	if (securelevel > 0 && p->p_pid == 1)
	132	return (EPERM);
	133
41c20dac	134	if (!CHECKIO(curp, p) \|\| p_trespass(curp->p_ucred, p->p_ucred))
984263bc MD	135	return (EPERM);
	136	}
	137
	138	/*
	139	* Attach - attaches the target process for debugging
	140	* by the calling process.
	141	*/
	142	if (op == PROCFS_CTL_ATTACH) {
	143	/* check whether already being traced */
4643740a	144	if (p->p_flags & P_TRACED)
984263bc MD	145	return (EBUSY);
	146
	147	/* can't trace yourself! */
	148	if (p->p_pid == curp->p_pid)
	149	return (EINVAL);
	150
	151	/*
	152	* Go ahead and set the trace flag.
	153	* Save the old parent (it's reset in
	154	* _DETACH, and also in kern_exit.c:wait4()
	155	* Reparent the process so that the tracing
	156	* proc gets to see all the action.
	157	* Stop the target.
	158	*/
4643740a	159	p->p_flags \|= P_TRACED;
984263bc MD	160	faultin(p);
	161	p->p_xstat = 0; /* XXX ? */
	162	if (p->p_pptr != curp) {
	163	p->p_oppid = p->p_pptr->p_pid;
	164	proc_reparent(p, curp);
	165	}
f33e8653	166	proc_stop(p);
984263bc MD	167	return (0);
	168	}
	169
	170	/*
	171	* Target process must be stopped, owned by (curp) and
	172	* be set up for tracing (P_TRACED flag set).
	173	* Allow DETACH to take place at any time for sanity.
	174	* Allow WAIT any time, of course.
	175	*/
	176	switch (op) {
	177	case PROCFS_CTL_DETACH:
	178	case PROCFS_CTL_WAIT:
	179	break;
	180
	181	default:
	182	if (!TRACE_WAIT_P(curp, p))
	183	return (EBUSY);
	184	}
	185
	186
	187	#ifdef FIX_SSTEP
	188	/*
	189	* do single-step fixup if needed
	190	*/
c7e98b2f	191	FIX_SSTEP(lp);
984263bc MD	192	#endif
	193
	194	/*
	195	* Don't deliver any signal by default.
	196	* To continue with a signal, just send
	197	* the signal name to the ctl file
	198	*/
	199	p->p_xstat = 0;
	200
	201	switch (op) {
	202	/*
	203	* Detach. Cleans up the target process, reparent it if possible
	204	* and set it running once more.
	205	*/
	206	case PROCFS_CTL_DETACH:
	207	/* if not being traced, then this is a painless no-op */
4643740a	208	if ((p->p_flags & P_TRACED) == 0)
984263bc MD	209	return (0);
	210
	211	/* not being traced any more */
4643740a	212	p->p_flags &= ~P_TRACED;
984263bc MD	213
984263bc MD	214	/* remove pending SIGTRAP, else the process will die */
94f98873	215	spin_lock(&lp->lwp_spin);
aa6c3de6	216	lwp_delsig(lp, SIGTRAP);
94f98873	217	spin_unlock(&lp->lwp_spin);
984263bc MD	218
	219	/* give process back to original parent */
	220	if (p->p_oppid != p->p_pptr->p_pid) {
	221	struct proc *pp;
	222
	223	pp = pfind(p->p_oppid);
58c2553a	224	if (pp) {
984263bc	225	proc_reparent(p, pp);
58c2553a MD	226	PRELE(pp);
58c2553a MD	227	}
984263bc MD	228	}
	229
	230	p->p_oppid = 0;
4643740a MD	231	p->p_flags &= ~P_WAITED; /* XXX ? */
4643740a MD	232	wakeup((caddr_t) curp); /* XXX for CTL_WAIT below ? */
984263bc MD	233
	234	break;
	235
	236	/*
	237	* Step. Let the target process execute a single instruction.
	238	*/
	239	case PROCFS_CTL_STEP:
c7e98b2f SS	240	LWPHOLD(lp);
	241	error = procfs_sstep(lp);
	242	LWPRELE(lp);
984263bc MD	243	if (error)
	244	return (error);
	245	break;
	246
	247	/*
	248	* Run. Let the target process continue running until a breakpoint
	249	* or some other trap.
	250	*/
	251	case PROCFS_CTL_RUN:
	252	break;
	253
	254	/*
	255	* Wait for the target process to stop.
	256	* If the target is not being traced then just wait
	257	* to enter
	258	*/
	259	case PROCFS_CTL_WAIT:
	260	error = 0;
4643740a	261	if (p->p_flags & P_TRACED) {
984263bc	262	while (error == 0 &&
164b8401	263	p->p_stat != SSTOP &&
4643740a	264	(p->p_flags & P_TRACED) &&
984263bc MD	265	(p->p_pptr == curp)) {
984263bc MD	266	error = tsleep((caddr_t) p,
377d4740	267	PCATCH, "procfsx", 0);
984263bc MD	268	}
	269	if (error == 0 && !TRACE_WAIT_P(curp, p))
	270	error = EBUSY;
	271	} else {
164b8401	272	while (error == 0 && p->p_stat != SSTOP) {
984263bc	273	error = tsleep((caddr_t) p,
377d4740	274	PCATCH, "procfs", 0);
984263bc MD	275	}
	276	}
	277	return (error);
	278
	279	default:
	280	panic("procfs_control");
	281	}
	282
344ad853 MD	283	/*
344ad853 MD	284	* If the process is in a stopped state, make it runnable again.
4643740a MD	285	* Do not set LWP_MP_BREAKTSLEEP - that is, do not break a tsleep
4643740a MD	286	* that might be in progress.
344ad853	287	*/
164b8401	288	if (p->p_stat == SSTOP)
9a379a4a	289	proc_unstop(p);
984263bc MD	290	return (0);
	291	}
	292
	293	int
c7e98b2f	294	procfs_doctl(struct proc curp, struct lwp lp, struct pfsnode *pfs,
ac424f9b	295	struct uio *uio)
984263bc	296	{
c7e98b2f	297	struct proc *p = lp->lwp_proc;
984263bc MD	298	int xlen;
	299	int error;
	300	char msg[PROCFS_CTLLEN+1];
	301	vfs_namemap_t *nm;
	302
5686ec5a	303	ASSERT_LWKT_TOKEN_HELD(&p->p_token);
98c2b8ac MD	304	ASSERT_LWKT_TOKEN_HELD(&proc_token);
98c2b8ac MD	305
984263bc MD	306	if (uio->uio_rw != UIO_WRITE)
	307	return (EOPNOTSUPP);
	308
	309	xlen = PROCFS_CTLLEN;
	310	error = vfs_getuserstr(uio, msg, &xlen);
	311	if (error)
	312	return (error);
	313
	314	/*
	315	* Map signal names into signal generation
	316	* or debug control. Unknown commands and/or signals
	317	* return EOPNOTSUPP.
	318	*
	319	* Sending a signal while the process is being debugged
	320	* also has the side effect of letting the target continue
	321	* to run. There is no way to single-step a signal delivery.
	322	*/
	323	error = EOPNOTSUPP;
	324
	325	nm = vfs_findname(ctlnames, msg, xlen);
	326	if (nm) {
c7e98b2f	327	error = procfs_control(curp, lp, nm->nm_val);
984263bc MD	328	} else {
	329	nm = vfs_findname(signames, msg, xlen);
	330	if (nm) {
	331	if (TRACE_WAIT_P(curp, p)) {
	332	p->p_xstat = nm->nm_val;
	333	#ifdef FIX_SSTEP
c7e98b2f	334	FIX_SSTEP(lp);
984263bc	335	#endif
344ad853 MD	336	/*
	337	* Make the process runnable but do not
	338	* break its tsleep.
	339	*/
9a379a4a	340	proc_unstop(p);
984263bc	341	} else {
84204577	342	ksignal(p, nm->nm_val);
984263bc MD	343	}
	344	error = 0;
	345	}
	346	}
	347
	348	return (error);
	349	}