procfs.c revision 87321
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 87321 2001-12-04 01:35:06Z des $
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 */
6787538Sdesstatic int
6887321Sdesprocfs_doprocfile(PFS_FILL_ARGS)
6987321Sdes{
7087321Sdes	char *fullpath = "unknown";
7187321Sdes	char *freepath = NULL;
7287321Sdes
7387538Sdes	vn_fullpath(td, td->td_proc->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 */
8387538Sdesstatic int
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 */
9790873Sdes	if (strcmp(pn->pn_name, "ctl") == 0 ||
9890873Sdes	    strcmp(pn->pn_name, "note") == 0 ||
9990873Sdes	    strcmp(pn->pn_name, "notepg") == 0)
10087321Sdes		vap->va_mode = 0200;
10187321Sdes	else if (strcmp(pn->pn_name, "mem") == 0 ||
10287321Sdes	    strcmp(pn->pn_name, "regs") == 0 ||
10387321Sdes	    strcmp(pn->pn_name, "dbregs") == 0 ||
10487321Sdes	    strcmp(pn->pn_name, "fpregs") == 0)
10587321Sdes		vap->va_mode = 0600;
10687321Sdes
10787321Sdes	/* p is locked by caller */
10887321Sdes	vap->va_uid = p->p_ucred->cr_uid;
10987321Sdes	vap->va_gid = p->p_ucred->cr_gid;
11096886Sjhb
11187321Sdes	return (0);
11287321Sdes}
11387321Sdes
11487321Sdes/*
11587321Sdes * Visibility: some files only exist for non-system processes
11687321Sdes * Non-static because linprocfs uses it.
11787321Sdes */
11887321Sdesint
11987321Sdesprocfs_notsystem(PFS_VIS_ARGS)
12087321Sdes{
12187321Sdes	return ((p->p_flag & P_SYSTEM) == 0);
12287321Sdes}
12387321Sdes
12487321Sdes/*
12587321Sdes * Visibility: some files are only visible to process that can debug
12687321Sdes * the target process.
12787321Sdes */
12887321Sdesint
12987321Sdesprocfs_candebug(PFS_VIS_ARGS)
13087321Sdes{
13187321Sdes	return ((p->p_flag & P_SYSTEM) == 0 &&
13287321Sdes	    p_candebug(td->td_proc, p) == 0);
13387321Sdes}
13496886Sjhb
13587321Sdes/*
13696886Sjhb * Constructor
13787321Sdes */
13887321Sdesstatic int
13987321Sdesprocfs_init(PFS_INIT_ARGS)
14087321Sdes{
14187321Sdes	struct pfs_node *root;
14287321Sdes	struct pfs_node *dir;
14387321Sdes	struct pfs_node *node;
14487321Sdes
14587321Sdes	root = pi->pi_root;
14687321Sdes
14787321Sdes	pfs_create_link(root, "curproc", &procfs_docurproc,
14887321Sdes	    NULL, NULL, 0);
14987321Sdes
15087321Sdes	dir = pfs_create_dir(root, "pid",
15187321Sdes	    &procfs_attr, NULL, PFS_PROCDEP);
15287321Sdes	pfs_create_file(dir, "cmdline", &procfs_doproccmdline,
15387321Sdes	    NULL, NULL, PFS_RD);
15487321Sdes	pfs_create_file(dir, "ctl", &procfs_doprocctl,
15587321Sdes	    &procfs_attr, NULL, PFS_WR);
15687321Sdes	pfs_create_file(dir, "dbregs", &procfs_doprocdbregs,
15787321Sdes	    &procfs_attr, &procfs_candebug, PFS_RDWR|PFS_RAW);
15887321Sdes	pfs_create_file(dir, "etype", &procfs_doproctype,
15987321Sdes	    NULL, NULL, PFS_RD);
16087321Sdes	pfs_create_file(dir, "fpregs", &procfs_doprocfpregs,
16187321Sdes	    &procfs_attr, &procfs_candebug, PFS_RDWR|PFS_RAW);
16287321Sdes	pfs_create_file(dir, "map", &procfs_doprocmap,
16387321Sdes	    NULL, &procfs_notsystem, PFS_RD);
16487321Sdes	node = pfs_create_file(dir, "mem", &procfs_doprocmem,
16587321Sdes	    &procfs_attr, &procfs_candebug, PFS_RDWR|PFS_RAW);
16687321Sdes#ifdef PROCFS_DEBUG
16787321Sdes	node->pn_ioctl = &procfs_ioctl;
16887321Sdes	node->pn_close = &procfs_close;
16987321Sdes#endif
17087321Sdes	pfs_create_file(dir, "note", &procfs_doprocnote,
17187321Sdes	    &procfs_attr, &procfs_candebug, PFS_WR);
17287321Sdes	pfs_create_file(dir, "notepg", &procfs_doprocnote,
17387321Sdes	    &procfs_attr, &procfs_candebug, PFS_WR);
17487321Sdes	pfs_create_file(dir, "regs", &procfs_doprocregs,
17587321Sdes	    &procfs_attr, &procfs_candebug, PFS_RDWR|PFS_RAW);
17687321Sdes	pfs_create_file(dir, "rlimit", &procfs_doprocrlimit,
17787321Sdes	    NULL, NULL, PFS_RD);
17887321Sdes	pfs_create_file(dir, "status", &procfs_doprocstatus,
17987321Sdes	    NULL, NULL, PFS_RD);
18087321Sdes
18187321Sdes	pfs_create_link(dir, "file", &procfs_doprocfile,
18287321Sdes	    NULL, procfs_notsystem, 0);
18387321Sdes
18487321Sdes	return (0);
18587321Sdes}
18687321Sdes
18787321Sdes/*
18887321Sdes * Destructor
18987321Sdes */
19087321Sdesstatic int
19187321Sdesprocfs_uninit(PFS_INIT_ARGS)
19287321Sdes{
19387321Sdes
19487321Sdes	/* nothing to do, pseudofs will GC */
19587321Sdes	return (0);
19687321Sdes}
19787321Sdes
19887321SdesPSEUDOFS(procfs, 1);
19987321Sdes