procfs_ioctl.c revision 147692
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 147692 2005-06-30 07:49:22Z peter $ 29 */ 30 31#include "opt_compat.h" 32 33#include <sys/param.h> 34#include <sys/lock.h> 35#include <sys/mutex.h> 36#include <sys/pioctl.h> 37#include <sys/proc.h> 38#include <sys/signalvar.h> 39#include <sys/systm.h> 40 41#include <fs/pseudofs/pseudofs.h> 42#include <fs/procfs/procfs.h> 43 44#ifdef COMPAT_IA32 45struct procfs_status32 { 46 int state; /* Running, stopped, something else? */ 47 int flags; /* Any flags */ 48 unsigned int events; /* Events to stop on */ 49 int why; /* What event, if any, proc stopped on */ 50 unsigned int val; /* Any extra data */ 51}; 52 53#define PIOCWAIT32 _IOR('p', 4, struct procfs_status32) 54#define PIOCSTATUS32 _IOR('p', 6, struct procfs_status32) 55#endif 56 57/* 58 * Process ioctls 59 */ 60int 61procfs_ioctl(PFS_IOCTL_ARGS) 62{ 63 struct procfs_status *ps; 64#ifdef COMPAT_IA32 65 struct procfs_status32 *ps32; 66#endif 67 int error, flags, sig; 68 69 PROC_LOCK(p); 70 error = 0; 71 switch (cmd) { 72#if defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) || defined(COMPAT_43) 73 case _IOC(IOC_IN, 'p', 1, 0): 74#endif 75 case PIOCBIS: 76 p->p_stops |= *(uintptr_t *)data; 77 break; 78#if defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) || defined(COMPAT_43) 79 case _IOC(IOC_IN, 'p', 2, 0): 80#endif 81 case PIOCBIC: 82 p->p_stops &= ~*(uintptr_t *)data; 83 break; 84#if defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) || defined(COMPAT_43) 85 case _IOC(IOC_IN, 'p', 3, 0): 86#endif 87 case PIOCSFL: 88 flags = *(uintptr_t *)data; 89 if (flags & PF_ISUGID && (error = suser(td)) != 0) 90 break; 91 p->p_pfsflags = flags; 92 break; 93 case PIOCGFL: 94 *(unsigned int *)data = p->p_pfsflags; 95 break; 96 case PIOCWAIT: 97 while (p->p_step == 0) { 98 /* sleep until p stops */ 99 error = msleep(&p->p_stype, &p->p_mtx, 100 PWAIT|PCATCH, "pioctl", 0); 101 if (error != 0) 102 break; 103 } 104 /* fall through to PIOCSTATUS */ 105 case PIOCSTATUS: 106 ps = (struct procfs_status *)data; 107 ps->state = (p->p_step == 0); 108 ps->flags = 0; /* nope */ 109 ps->events = p->p_stops; 110 ps->why = p->p_step ? p->p_stype : 0; 111 ps->val = p->p_step ? p->p_xstat : 0; 112 break; 113#ifdef COMPAT_IA32 114 case PIOCWAIT32: 115 while (p->p_step == 0) { 116 /* sleep until p stops */ 117 error = msleep(&p->p_stype, &p->p_mtx, 118 PWAIT|PCATCH, "pioctl", 0); 119 if (error != 0) 120 break; 121 } 122 /* fall through to PIOCSTATUS32 */ 123 case PIOCSTATUS32: 124 ps32 = (struct procfs_status32 *)data; 125 ps32->state = (p->p_step == 0); 126 ps32->flags = 0; /* nope */ 127 ps32->events = p->p_stops; 128 ps32->why = p->p_step ? p->p_stype : 0; 129 ps32->val = p->p_step ? p->p_xstat : 0; 130 break; 131#endif 132#if defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) || defined(COMPAT_43) 133 case _IOC(IOC_IN, 'p', 5, 0): 134#endif 135 case PIOCCONT: 136 if (p->p_step == 0) 137 break; 138 sig = *(uintptr_t *)data; 139 if (sig != 0 && !_SIG_VALID(sig)) { 140 error = EINVAL; 141 break; 142 } 143#if 0 144 p->p_step = 0; 145 if (P_SHOULDSTOP(p)) { 146 p->p_xstat = sig; 147 p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG); 148 mtx_lock_spin(&sched_lock); 149 thread_unsuspend(p); 150 mtx_unlock_spin(&sched_lock); 151 } else if (sig) 152 psignal(p, sig); 153#else 154 if (sig) 155 psignal(p, sig); 156 p->p_step = 0; 157 wakeup(&p->p_step); 158#endif 159 break; 160 default: 161 error = (ENOTTY); 162 } 163 PROC_UNLOCK(p); 164 165 return (error); 166} 167 168/* 169 * Clean up on last close 170 */ 171int 172procfs_close(PFS_CLOSE_ARGS) 173{ 174 if (p != NULL && (p->p_pfsflags & PF_LINGER) == 0) { 175 PROC_LOCK_ASSERT(p, MA_OWNED); 176 p->p_pfsflags = 0; 177 p->p_stops = 0; 178 p->p_step = 0; 179 wakeup(&p->p_step); 180 } 181 return (0); 182} 183