1/* $NetBSD: procfs_cmdline.c,v 1.27 2008/04/28 20:24:08 martin 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 1.27 2008/04/28 20:24:08 martin 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 48static int 49procfs_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 */ 63int 64procfs_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