1 /* $NetBSD: procfs_cmdline.c,v 1.1 1999/03/12 18:45:40 christos 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 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 #include <sys/param.h> 41 #include <sys/types.h> 42 #include <sys/systm.h> 43 #include <sys/syslimits.h> 44 #include <sys/proc.h> 45 #include <sys/vnode.h> 46 #include <sys/exec.h> 47 #include <miscfs/procfs/procfs.h> 48 49 /* 50 * code for returning process's command line arguments 51 */ 52 int 53 procfs_docmdline(curp, p, pfs, uio) 54 struct proc *curp; 55 struct proc *p; 56 struct pfsnode *pfs; 57 struct uio *uio; 58 { 59 struct ps_strings pss; 60 char arg[ARG_MAX], *argv; 61 int xlen, len, count, i; 62 63 /* don't write; can't work for zombies -- they don't have any stack */ 64 if (uio->uio_rw != UIO_READ || p->p_stat == SZOMB) 65 return EOPNOTSUPP; 66 67 if (copyin(PS_STRINGS, &pss, sizeof(struct ps_strings))) 68 return EFAULT; 69 if (copyin(pss.ps_argvstr, &argv, sizeof(argv))) 70 return EFAULT; 71 len = 0; 72 count = pss.ps_nargvstr; 73 /* don't know how long the argument string is, so let's find out */ 74 while(count && len < ARG_MAX && copyin(argv+len, &arg[len], 1) == 0) { 75 if (len > 0 && arg[len] == '\0') count--; 76 len++; 77 } 78 if (len > 0) len--; /* exclude last NULL */ 79 80 xlen = len - uio->uio_offset; 81 xlen = imin(xlen, uio->uio_resid); 82 if (xlen <= 0) 83 return 0; 84 else 85 return (uiomove(arg + uio->uio_offset, xlen, uio)); 86 } 87