procfs.c revision 96886
187321Sdes/* 287321Sdes * Copyright (c) 2001 Dag-Erling Sm�rgrav 387321Sdes * Copyright (c) 1993 Jan-Simon Pendry 487321Sdes * Copyright (c) 1993 587321Sdes * The Regents of the University of California. All rights reserved. 687321Sdes * 787321Sdes * This code is derived from software contributed to Berkeley by 887321Sdes * Jan-Simon Pendry. 987321Sdes * 1087321Sdes * Redistribution and use in source and binary forms, with or without 1187321Sdes * modification, are permitted provided that the following conditions 1287321Sdes * are met: 1387321Sdes * 1. Redistributions of source code must retain the above copyright 1487321Sdes * notice, this list of conditions and the following disclaimer. 1587321Sdes * 2. Redistributions in binary form must reproduce the above copyright 1687321Sdes * notice, this list of conditions and the following disclaimer in the 1787321Sdes * documentation and/or other materials provided with the distribution. 1887321Sdes * 3. All advertising materials mentioning features or use of this software 1987321Sdes * must display the following acknowledgement: 2087321Sdes * This product includes software developed by the University of 2187321Sdes * California, Berkeley and its contributors. 2287321Sdes * 4. Neither the name of the University nor the names of its contributors 2387321Sdes * may be used to endorse or promote products derived from this software 2487321Sdes * without specific prior written permission. 2587321Sdes * 2687321Sdes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2787321Sdes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2887321Sdes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2987321Sdes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 3087321Sdes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 3187321Sdes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3287321Sdes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3387321Sdes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3487321Sdes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3587321Sdes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3687321Sdes * SUCH DAMAGE. 3787321Sdes * 3887321Sdes * @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95 3987321Sdes * 4087321Sdes * $FreeBSD: head/sys/fs/procfs/procfs.c 96886 2002-05-19 00:14:50Z jhb $ 4187321Sdes */ 4287321Sdes 4387321Sdes#include <sys/param.h> 4487321Sdes#include <sys/queue.h> 4587321Sdes#include <sys/exec.h> 4687321Sdes#include <sys/lock.h> 4787321Sdes#include <sys/kernel.h> 4887321Sdes#include <sys/malloc.h> 4987321Sdes#include <sys/mount.h> 5087321Sdes#include <sys/mutex.h> 5187321Sdes#include <sys/proc.h> 5287321Sdes#include <sys/sbuf.h> 5387321Sdes#include <sys/sysproto.h> 5487321Sdes#include <sys/systm.h> 5587321Sdes#include <sys/vnode.h> 5687321Sdes 5787321Sdes#include <vm/vm.h> 5887321Sdes#include <vm/pmap.h> 5987321Sdes#include <vm/vm_param.h> 6087321Sdes 6187321Sdes#include <fs/pseudofs/pseudofs.h> 6287321Sdes#include <fs/procfs/procfs.h> 6387321Sdes 6487321Sdes/* 6587321Sdes * Filler function for proc/pid/self 6687321Sdes */ 6787321Sdesint 6887321Sdesprocfs_doprocfile(PFS_FILL_ARGS) 6987321Sdes{ 7087321Sdes char *fullpath = "unknown"; 7187321Sdes char *freepath = NULL; 7287321Sdes 7387321Sdes vn_fullpath(td, p->p_textvp, &fullpath, &freepath); 7487321Sdes sbuf_printf(sb, "%s", fullpath); 7587321Sdes if (freepath) 7687321Sdes free(freepath, M_TEMP); 7787321Sdes return (0); 7887321Sdes} 7987321Sdes 8087321Sdes/* 8187321Sdes * Filler function for proc/curproc 8287321Sdes */ 8387321Sdesint 8487321Sdesprocfs_docurproc(PFS_FILL_ARGS) 8587321Sdes{ 8687321Sdes sbuf_printf(sb, "%ld", (long)td->td_proc->p_pid); 8787321Sdes return (0); 8887321Sdes} 8987321Sdes 9087321Sdes/* 9187321Sdes * Adjust mode for some nodes that need it 9287321Sdes */ 9387321Sdesint 9487321Sdesprocfs_attr(PFS_ATTR_ARGS) 9587321Sdes{ 9687321Sdes /* XXX inefficient, split into separate functions */ 9787321Sdes if (p->p_flag & P_SUGID) 9887321Sdes vap->va_mode = 0; 9987321Sdes else if (strcmp(pn->pn_name, "ctl") == 0 || 10087321Sdes strcmp(pn->pn_name, "note") == 0 || 10187321Sdes strcmp(pn->pn_name, "notepg") == 0) 10287321Sdes vap->va_mode = 0200; 10387321Sdes else if (strcmp(pn->pn_name, "mem") == 0 || 10487321Sdes strcmp(pn->pn_name, "regs") == 0 || 10587321Sdes strcmp(pn->pn_name, "dbregs") == 0 || 10687321Sdes strcmp(pn->pn_name, "fpregs") == 0) 10787321Sdes vap->va_mode = 0600; 10887321Sdes 10987321Sdes /* p is locked by caller */ 11087321Sdes PROC_LOCK_ASSERT(p, MA_OWNED); 11187321Sdes vap->va_uid = p->p_ucred->cr_uid; 11287321Sdes vap->va_gid = p->p_ucred->cr_gid; 11387321Sdes 11487321Sdes return (0); 11587321Sdes} 11687321Sdes 11787321Sdes/* 11887321Sdes * Visibility: some files only exist for non-system processes 11987321Sdes * Non-static because linprocfs uses it. 12087321Sdes */ 12187321Sdesint 12287321Sdesprocfs_notsystem(PFS_VIS_ARGS) 12387321Sdes{ 12487321Sdes return ((p->p_flag & P_SYSTEM) == 0); 12587321Sdes} 12687321Sdes 12787321Sdes/* 12887321Sdes * Visibility: some files are only visible to process that can debug 12987321Sdes * the target process. 13087321Sdes */ 13187321Sdesint 13287321Sdesprocfs_candebug(PFS_VIS_ARGS) 13387321Sdes{ 13487321Sdes PROC_LOCK_ASSERT(p, MA_OWNED); 13587321Sdes return ((p->p_flag & P_SYSTEM) == 0 && 13687321Sdes p_candebug(td, p) == 0); 13787321Sdes} 13887321Sdes 13987321Sdes/* 14087321Sdes * Constructor 14187321Sdes */ 14287321Sdesstatic int 14387321Sdesprocfs_init(PFS_INIT_ARGS) 14487321Sdes{ 14587321Sdes struct pfs_node *root; 14687321Sdes struct pfs_node *dir; 14787321Sdes struct pfs_node *node; 14887321Sdes 14987321Sdes root = pi->pi_root; 15087321Sdes 15187321Sdes pfs_create_link(root, "curproc", &procfs_docurproc, 15287321Sdes NULL, NULL, 0); 15387321Sdes 15487321Sdes dir = pfs_create_dir(root, "pid", 15587321Sdes &procfs_attr, NULL, PFS_PROCDEP); 15687321Sdes pfs_create_file(dir, "cmdline", &procfs_doproccmdline, 15787321Sdes NULL, NULL, PFS_RD); 15887321Sdes pfs_create_file(dir, "ctl", &procfs_doprocctl, 15987321Sdes &procfs_attr, NULL, PFS_WR); 16087321Sdes pfs_create_file(dir, "dbregs", &procfs_doprocdbregs, 16187321Sdes &procfs_attr, &procfs_candebug, PFS_RDWR|PFS_RAW); 16287321Sdes pfs_create_file(dir, "etype", &procfs_doproctype, 16387321Sdes NULL, NULL, PFS_RD); 16487321Sdes pfs_create_file(dir, "fpregs", &procfs_doprocfpregs, 16587321Sdes &procfs_attr, &procfs_candebug, PFS_RDWR|PFS_RAW); 16687321Sdes pfs_create_file(dir, "map", &procfs_doprocmap, 16787321Sdes NULL, &procfs_notsystem, PFS_RD); 16887321Sdes node = pfs_create_file(dir, "mem", &procfs_doprocmem, 16987321Sdes &procfs_attr, &procfs_candebug, PFS_RDWR|PFS_RAW); 17087321Sdes node->pn_ioctl = &procfs_ioctl; 17187321Sdes node->pn_close = &procfs_close; 17287321Sdes pfs_create_file(dir, "note", &procfs_doprocnote, 17387321Sdes &procfs_attr, &procfs_candebug, PFS_WR); 17487321Sdes pfs_create_file(dir, "notepg", &procfs_doprocnote, 17587321Sdes &procfs_attr, &procfs_candebug, PFS_WR); 17687321Sdes pfs_create_file(dir, "regs", &procfs_doprocregs, 17787321Sdes &procfs_attr, &procfs_candebug, PFS_RDWR|PFS_RAW); 17887321Sdes pfs_create_file(dir, "rlimit", &procfs_doprocrlimit, 17987321Sdes NULL, NULL, PFS_RD); 18087321Sdes pfs_create_file(dir, "status", &procfs_doprocstatus, 18187321Sdes NULL, NULL, PFS_RD); 18287321Sdes 18387321Sdes pfs_create_link(dir, "file", &procfs_doprocfile, 18487321Sdes NULL, procfs_notsystem, 0); 18587321Sdes 18687321Sdes return (0); 18787321Sdes} 18887321Sdes 18987321Sdes/* 19087321Sdes * Destructor 19187321Sdes */ 19287321Sdesstatic int 19387321Sdesprocfs_uninit(PFS_INIT_ARGS) 19487321Sdes{ 19587321Sdes 19687321Sdes /* nothing to do, pseudofs will GC */ 19787321Sdes return (0); 19887321Sdes} 199 200PSEUDOFS(procfs, 1); 201