1 | /* $NetBSD: procfs_cmdline.c,v 1.28 2011/03/04 22:25:32 joerg Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (c) 1999 Jaromir Dolecek <dolecek@ics.muni.cz> |
5 | * Copyright (c) 1999 The NetBSD Foundation, Inc. |
6 | * All rights reserved. |
7 | * |
8 | * This code is derived from software contributed to The NetBSD Foundation |
9 | * by Jaromir Dolecek. |
10 | * |
11 | * Redistribution and use in source and binary forms, with or without |
12 | * modification, are permitted provided that the following conditions |
13 | * are met: |
14 | * 1. Redistributions of source code must retain the above copyright |
15 | * notice, this list of conditions and the following disclaimer. |
16 | * 2. Redistributions in binary form must reproduce the above copyright |
17 | * notice, this list of conditions and the following disclaimer in the |
18 | * documentation and/or other materials provided with the distribution. |
19 | * |
20 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
21 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
22 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
23 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
24 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
25 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
26 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
29 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
30 | * POSSIBILITY OF SUCH DAMAGE. |
31 | */ |
32 | |
33 | #include <sys/cdefs.h> |
34 | __KERNEL_RCSID(0, "$NetBSD: procfs_cmdline.c,v 1.28 2011/03/04 22:25:32 joerg Exp $" ); |
35 | |
36 | #include <sys/param.h> |
37 | #include <sys/systm.h> |
38 | #include <sys/syslimits.h> |
39 | #include <sys/proc.h> |
40 | #include <sys/vnode.h> |
41 | #include <sys/exec.h> |
42 | #include <sys/malloc.h> |
43 | #include <sys/sysctl.h> |
44 | #include <miscfs/procfs/procfs.h> |
45 | |
46 | #include <uvm/uvm_extern.h> |
47 | |
48 | static int |
49 | procfs_docmdline_helper(void *cookie, const void *src, size_t off, size_t len) |
50 | { |
51 | struct uio *uio = cookie; |
52 | char *buf = __UNCONST(src); |
53 | |
54 | buf += uio->uio_offset - off; |
55 | if (off + len <= uio->uio_offset) |
56 | return 0; |
57 | return uiomove(buf, off + len - uio->uio_offset, cookie); |
58 | } |
59 | |
60 | /* |
61 | * code for returning process's command line arguments |
62 | */ |
63 | int |
64 | procfs_docmdline( |
65 | struct lwp *curl, |
66 | struct proc *p, |
67 | struct pfsnode *pfs, |
68 | struct uio *uio |
69 | ) |
70 | { |
71 | size_t len, start; |
72 | int error; |
73 | |
74 | /* Don't allow writing. */ |
75 | if (uio->uio_rw != UIO_READ) |
76 | return (EOPNOTSUPP); |
77 | |
78 | /* |
79 | * Zombies don't have a stack, so we can't read their psstrings. |
80 | * System processes also don't have a user stack. This is what |
81 | * ps(1) would display. |
82 | */ |
83 | if (P_ZOMBIE(p) || (p->p_flag & PK_SYSTEM) != 0) { |
84 | static char msg[] = "()" ; |
85 | error = 0; |
86 | if (0 == uio->uio_offset) { |
87 | error = uiomove(msg, 1, uio); |
88 | if (error) |
89 | return (error); |
90 | } |
91 | len = strlen(p->p_comm); |
92 | if (len >= uio->uio_offset) { |
93 | start = uio->uio_offset - 1; |
94 | error = uiomove(p->p_comm + start, len - start, uio); |
95 | if (error) |
96 | return (error); |
97 | } |
98 | if (len + 2 >= uio->uio_offset) { |
99 | start = uio->uio_offset - 1 - len; |
100 | error = uiomove(msg + 1 + start, 2 - start, uio); |
101 | } |
102 | return (error); |
103 | } |
104 | |
105 | len = uio->uio_offset + uio->uio_resid; |
106 | |
107 | error = copy_procargs(p, KERN_PROC_ARGV, &len, |
108 | procfs_docmdline_helper, uio); |
109 | return error; |
110 | } |
111 | |