procfs_ioctl.c revision 147676
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 147676 2005-06-30 00:19:08Z 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/* 45 * Process ioctls 46 */ 47int 48procfs_ioctl(PFS_IOCTL_ARGS) 49{ 50 struct procfs_status *ps; 51 int error, flags, sig; 52 53 PROC_LOCK(p); 54 error = 0; 55 switch (cmd) { 56#if defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) || defined(COMPAT_43) 57 case _IOC(IOC_IN, 'p', 1, 0): 58#endif 59 case PIOCBIS: 60 p->p_stops |= *(uintptr_t *)data; 61 break; 62#if defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) || defined(COMPAT_43) 63 case _IOC(IOC_IN, 'p', 2, 0): 64#endif 65 case PIOCBIC: 66 p->p_stops &= ~*(uintptr_t *)data; 67 break; 68#if defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) || defined(COMPAT_43) 69 case _IOC(IOC_IN, 'p', 3, 0): 70#endif 71 case PIOCSFL: 72 flags = *(uintptr_t *)data; 73 if (flags & PF_ISUGID && (error = suser(td)) != 0) 74 break; 75 p->p_pfsflags = flags; 76 break; 77 case PIOCGFL: 78 *(unsigned int *)data = p->p_pfsflags; 79 break; 80 case PIOCWAIT: 81 while (p->p_step == 0) { 82 /* sleep until p stops */ 83 error = msleep(&p->p_stype, &p->p_mtx, 84 PWAIT|PCATCH, "pioctl", 0); 85 if (error != 0) 86 break; 87 } 88 /* fall through to PIOCSTATUS */ 89 case PIOCSTATUS: 90 ps = (struct procfs_status *)data; 91 ps->state = (p->p_step == 0); 92 ps->flags = 0; /* nope */ 93 ps->events = p->p_stops; 94 ps->why = p->p_step ? p->p_stype : 0; 95 ps->val = p->p_step ? p->p_xstat : 0; 96 break; 97#if defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) || defined(COMPAT_43) 98 case _IOC(IOC_IN, 'p', 5, 0): 99#endif 100 case PIOCCONT: 101 if (p->p_step == 0) 102 break; 103 sig = *(uintptr_t *)data; 104 if (sig != 0 && !_SIG_VALID(sig)) { 105 error = EINVAL; 106 break; 107 } 108#if 0 109 p->p_step = 0; 110 if (P_SHOULDSTOP(p)) { 111 p->p_xstat = sig; 112 p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG); 113 mtx_lock_spin(&sched_lock); 114 thread_unsuspend(p); 115 mtx_unlock_spin(&sched_lock); 116 } else if (sig) 117 psignal(p, sig); 118#else 119 if (sig) 120 psignal(p, sig); 121 p->p_step = 0; 122 wakeup(&p->p_step); 123#endif 124 break; 125 default: 126 error = (ENOTTY); 127 } 128 PROC_UNLOCK(p); 129 130 return (error); 131} 132 133/* 134 * Clean up on last close 135 */ 136int 137procfs_close(PFS_CLOSE_ARGS) 138{ 139 if (p != NULL && (p->p_pfsflags & PF_LINGER) == 0) { 140 PROC_LOCK_ASSERT(p, MA_OWNED); 141 p->p_pfsflags = 0; 142 p->p_stops = 0; 143 p->p_step = 0; 144 wakeup(&p->p_step); 145 } 146 return (0); 147} 148