109 lines
3.4 KiB
C
109 lines
3.4 KiB
C
/* $NetBSD: procfs_cmdline.c,v 1.32 2019/09/27 14:36:18 christos Exp $ */
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/*
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* Copyright (c) 1999 Jaromir Dolecek <dolecek@ics.muni.cz>
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* Copyright (c) 1999 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jaromir Dolecek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: procfs_cmdline.c,v 1.32 2019/09/27 14:36:18 christos Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/syslimits.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <sys/exec.h>
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#include <sys/malloc.h>
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#include <sys/sysctl.h>
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#include <miscfs/procfs/procfs.h>
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#include <uvm/uvm_extern.h>
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static int
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procfs_doprocargs_helper(void *cookie, const void *src, size_t off, size_t len)
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{
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struct uio *uio = cookie;
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char *buf = __UNCONST(src);
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buf += uio->uio_offset - off;
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if (off + len <= (uintmax_t)uio->uio_offset)
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return 0;
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return uiomove(buf, off + len - uio->uio_offset, cookie);
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}
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/*
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* code for returning process's command line arguments/environment
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*/
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int
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procfs_doprocargs(
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struct lwp *curl,
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struct proc *p,
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struct pfsnode *pfs,
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struct uio *uio,
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int oid
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)
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{
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size_t len, start;
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int error;
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/* Don't allow writing. */
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if (uio->uio_rw != UIO_READ)
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return EOPNOTSUPP;
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/*
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* Zombies don't have a stack, so we can't read their psstrings.
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* System processes also don't have a user stack. This is what
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* ps(1) would display.
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*/
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if (P_ZOMBIE(p) || (p->p_flag & PK_SYSTEM) != 0) {
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static char msg[] = "()";
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error = 0;
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if (0 == uio->uio_offset) {
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error = uiomove(msg, 1, uio);
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if (error)
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return error;
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}
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len = strlen(p->p_comm);
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if (len >= (uintmax_t)uio->uio_offset) {
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start = uio->uio_offset - 1;
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error = uiomove(p->p_comm + start, len - start, uio);
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if (error)
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return error;
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}
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if (len + 2 >= (uintmax_t)uio->uio_offset) {
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start = uio->uio_offset - 1 - len;
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error = uiomove(msg + 1 + start, 2 - start, uio);
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}
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return error;
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}
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len = uio->uio_offset + uio->uio_resid;
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return copy_procargs(p, oid, &len, procfs_doprocargs_helper, uio);
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}
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