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procfs_cmdline.c revision 1.1 
      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 (at) 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