| 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 | |