AMD64 - Refactor uio_resid and size_t assumptions.
[dragonfly.git] / sys / vfs / procfs / procfs_rlimit.c
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1/*
2 * Copyright (c) 1999 Adrian Chadd
3 * Copyright (c) 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Jan-Simon Pendry.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * @(#)procfs_status.c 8.4 (Berkeley) 6/15/94
38 *
39 * $FreeBSD: src/sys/miscfs/procfs/procfs_rlimit.c,v 1.5 1999/12/08 08:59:37 phk Exp $
c7e98b2f 40 * $DragonFly: src/sys/vfs/procfs/procfs_rlimit.c,v 1.7 2007/02/19 01:14:24 corecode Exp $
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41 */
42
43/*
44 * To get resource.h to include our rlimit_ident[] array of rlimit identifiers
45 */
46
47#define _RLIMIT_IDENT
48
49#include <sys/param.h>
50#include <sys/systm.h>
51#include <sys/proc.h>
52#include <sys/vnode.h>
53#include <sys/resourcevar.h>
54#include <sys/resource.h>
55#include <sys/types.h>
1f2de5d4 56#include <vfs/procfs/procfs.h>
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57
58
59int
c7e98b2f 60procfs_dorlimit(struct proc *curp, struct lwp *lp, struct pfsnode *pfs,
ac424f9b 61 struct uio *uio)
984263bc 62{
c7e98b2f 63 struct proc *p = lp->lwp_proc;
e54488bb 64 size_t xlen;
984263bc 65 char *ps;
984263bc 66 int error;
e54488bb 67 int i;
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68 char psbuf[512]; /* XXX - conservative */
69
70 if (uio->uio_rw != UIO_READ)
71 return (EOPNOTSUPP);
72
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73 ps = psbuf;
74
75 for (i = 0; i < RLIM_NLIMITS; i++) {
76
77 /*
78 * Add the rlimit ident
79 */
80
f8c7a42d 81 ps += ksprintf(ps, "%s ", rlimit_ident[i]);
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82
83 /*
84 * Replace RLIM_INFINITY with -1 in the string
85 */
86
87 /*
88 * current limit
89 */
90
91 if (p->p_rlimit[i].rlim_cur == RLIM_INFINITY) {
f8c7a42d 92 ps += ksprintf(ps, "-1 ");
984263bc 93 } else {
f8c7a42d 94 ps += ksprintf(ps, "%llu ",
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95 (unsigned long long)p->p_rlimit[i].rlim_cur);
96 }
97
98 /*
99 * maximum limit
100 */
101
102 if (p->p_rlimit[i].rlim_max == RLIM_INFINITY) {
f8c7a42d 103 ps += ksprintf(ps, "-1\n");
984263bc 104 } else {
f8c7a42d 105 ps += ksprintf(ps, "%llu\n",
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106 (unsigned long long)p->p_rlimit[i].rlim_max);
107 }
108 }
109
110 /*
111 * This logic is rather tasty - but its from procfs_status.c, so
112 * I guess I'll use it here.
113 */
114
115 xlen = ps - psbuf;
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116 xlen -= (size_t)uio->uio_offset;
117 ps = psbuf + (size_t)uio->uio_offset;
118 xlen = szmin(xlen, uio->uio_resid);
119 if (xlen == 0)
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120 error = 0;
121 else
d85c6823 122 error = uiomove_frombuf(psbuf, xlen, uio);
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123 return (error);
124}
125