procfs_ioctl.c revision 87321 
1/*-
2 * Copyright (c) 2001 Dag-Erling Co�dan Sm�rgrav
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer
10 *    in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 *    derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 *      $FreeBSD: head/sys/fs/procfs/procfs_ioctl.c 87321 2001-12-04 01:35:06Z des $
29 */
30
31#include <sys/param.h>
32#include <sys/lock.h>
33#include <sys/mutex.h>
34#include <sys/pioctl.h>
35#include <sys/proc.h>
36#include <sys/signalvar.h>
37#include <sys/systm.h>
38
39#include <fs/pseudofs/pseudofs.h>
40#include <fs/procfs/procfs.h>
41
42#ifdef PROCFS_DEBUG
43/*
44 * Process ioctls
45 */
46int
47procfs_ioctl(PFS_IOCTL_ARGS)
48{
49	struct procfs_status *ps;
50	int error, sig;
51
52	PROC_LOCK(p);
53	error = 0;
54	switch (cmd) {
55	case PIOCBIS:
56		p->p_stops |= *(unsigned int *)data;
57		break;
58	case PIOCBIC:
59		p->p_stops &= ~*(unsigned int *)data;
60		break;
61	case PIOCSFL:
62		/* ignore */
63		break;
64	case PIOCGFL:
65		*(unsigned int *)data = 0; /* nope */
66		break;
67	case PIOCWAIT:
68		while (p->p_step == 0) {
69			/* sleep until p stops */
70			error = msleep(&p->p_stype, &p->p_mtx,
71			    PWAIT|PCATCH, "pioctl", 0);
72			if (error != 0)
73				break;
74		}
75		/* fall through to PIOCSTATUS */
76	case PIOCSTATUS:
77		ps = (struct procfs_status *)data;
78		ps->state = (p->p_step == 0);
79		ps->flags = 0; /* nope */
80		ps->events = p->p_stops;
81		ps->why = p->p_step ? p->p_stype : 0;
82		ps->val = p->p_step ? p->p_xstat : 0;
83		break;
84	case PIOCCONT:
85		if (p->p_step)
86			break;
87		sig = *(int *)data;
88		if (!_SIG_VALID(sig)) {
89			error = EINVAL;
90			break;
91		}
92#if 0
93		mtx_lock_spin(&sched_lock);
94		p->p_step = 0;
95		if (p->p_stat == SSTOP) {
96			p->p_xstat = sig;
97			setrunnable(&p->p_thread);
98			mtx_unlock_spin(&sched_lock);
99		} else {
100			mtx_unlock_spin(&sched_lock);
101			if (sig)
102				psignal(p, sig);
103		}
104#else
105		if (sig)
106			psignal(p, sig);
107		wakeup(&p->p_step);
108#endif
109		break;
110	default:
111		error = (ENOTTY);
112	}
113	PROC_UNLOCK(p);
114
115	return (error);
116}
117
118/*
119 * Clean up on last close
120 */
121int
122procfs_close(PFS_CLOSE_ARGS)
123{
124	if (p != NULL && (p->p_pfsflags & PF_LINGER) == 0) {
125		p->p_pfsflags = 0;
126		p->p_stops = 0;
127		p->p_step = 0;
128		wakeup(&p->p_step);
129	}
130	return (0);
131}
132#endif
133