Merge from vendor branch LIBARCHIVE:
[dragonfly.git] / sys / vfs / procfs / procfs_dbregs.c
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1/*-
2 * Copyright (c) 1999 Brian Scott Dean, brdean@unx.sas.com.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Jan-Simon Pendry under the following copyrights and conditions:
7 *
8 * Copyright (c) 1993 Jan-Simon Pendry
9 * Copyright (c) 1993
10 * The Regents of the University of California. All rights reserved.
11 *
12 * This code is derived from software contributed to Berkeley by
13 * Jan-Simon Pendry.
14 *
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
17 * are met:
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
23 * 3. All advertising materials mentioning features or use of this software
24 * must display the following acknowledgement:
25 * This product includes software developed by the University of
26 * California, Berkeley and its contributors.
27 * 4. Neither the name of the University nor the names of its contributors
28 * may be used to endorse or promote products derived from this software
29 * without specific prior written permission.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
34 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 * SUCH DAMAGE.
42 *
43 * $FreeBSD: src/sys/miscfs/procfs/procfs_dbregs.c,v 1.4.2.3 2002/01/22 17:22:59 nectar Exp $
c7e98b2f 44 * $DragonFly: src/sys/vfs/procfs/procfs_dbregs.c,v 1.10 2007/02/19 01:14:24 corecode Exp $
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45 */
46
47#include <sys/param.h>
48#include <sys/proc.h>
49#include <sys/vnode.h>
527fddf7 50#include <sys/reg.h>
1f2de5d4 51#include <vfs/procfs/procfs.h>
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52#include <vm/vm.h>
53
54int
c7e98b2f 55procfs_dodbregs(struct proc *curp, struct lwp *lp, struct pfsnode *pfs,
ac424f9b 56 struct uio *uio)
984263bc 57{
c7e98b2f 58 struct proc *p = lp->lwp_proc;
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59 int error;
60 struct dbreg r;
61 char *kv;
62 int kl;
63
64 /* Can't trace a process that's currently exec'ing. */
65 if ((p->p_flag & P_INEXEC) != 0)
66 return EAGAIN;
41c20dac 67 if (!CHECKIO(curp, p) || p_trespass(curp->p_ucred, p->p_ucred))
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68 return (EPERM);
69 kl = sizeof(r);
70 kv = (char *) &r;
71
72 kv += uio->uio_offset;
73 kl -= uio->uio_offset;
74 if (kl > uio->uio_resid)
75 kl = uio->uio_resid;
76
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77 LWPHOLD(lp);
78 error = procfs_read_dbregs(lp, &r);
984263bc 79 if (error == 0)
25e80b06 80 error = uiomove_frombuf(&r, sizeof(r), uio);
984263bc 81 if (error == 0 && uio->uio_rw == UIO_WRITE) {
c7e98b2f 82 if (lp->lwp_stat != LSSTOP)
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83 error = EBUSY;
84 else
c7e98b2f 85 error = procfs_write_dbregs(lp, &r);
984263bc 86 }
c7e98b2f 87 LWPRELE(lp);
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88
89 uio->uio_offset = 0;
90 return (error);
91}
92
93int
c7e98b2f 94procfs_validdbregs(struct lwp *lp)
984263bc 95{
c7e98b2f 96 return ((lp->lwp_proc->p_flag & P_SYSTEM) == 0);
984263bc 97}