2019-09-27 17:36:18 +03:00
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/* $NetBSD: procfs_limit.c,v 1.3 2019/09/27 14:36:18 christos Exp $ */
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2019-03-31 02:28:30 +03:00
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/*-
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* Copyright (c) 2019 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 Christos Zoulas.
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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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2019-09-27 17:36:18 +03:00
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__KERNEL_RCSID(0, "$NetBSD: procfs_limit.c,v 1.3 2019/09/27 14:36:18 christos Exp $");
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2019-03-31 02:28:30 +03:00
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <sys/resource.h>
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#include <miscfs/procfs/procfs.h>
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#define MAXBUFFERSIZE (256 * 1024)
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static size_t
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prl(char *buf, size_t len, intmax_t lim, char sep)
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{
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if (lim == RLIM_INFINITY)
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return snprintf(buf, len, "%#20jx%c", lim, sep);
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else
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return snprintf(buf, len, "%20jd%c", lim, sep);
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}
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int
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procfs_dolimit(struct lwp *curl, struct proc *p, struct pfsnode *pfs,
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struct uio *uio)
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{
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static const char *label[] = RLIM_STRINGS;
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int error;
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char *buffer;
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size_t bufsize, pos, i;
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struct rlimit rl[RLIM_NLIMITS];
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if (uio->uio_rw != UIO_READ)
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return EOPNOTSUPP;
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mutex_enter(proc_lock);
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mutex_enter(p->p_lock);
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memcpy(rl, p->p_rlimit, sizeof(rl));
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mutex_exit(p->p_lock);
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mutex_exit(proc_lock);
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error = 0;
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bufsize = (64 * 3) * __arraycount(rl);
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buffer = malloc(bufsize, M_TEMP, M_WAITOK);
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pos = 0;
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for (i = 0; i < __arraycount(rl); i++) {
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pos += snprintf(buffer + pos, bufsize - pos, "%20.20s ",
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label[i]);
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pos += prl(buffer + pos, bufsize - pos, rl[i].rlim_cur, ' ');
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pos += prl(buffer + pos, bufsize - pos, rl[i].rlim_max, '\n');
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}
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2019-09-27 17:36:18 +03:00
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if ((uintmax_t)uio->uio_offset < pos)
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2019-03-31 02:28:30 +03:00
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error = uiomove(buffer + uio->uio_offset,
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pos - uio->uio_offset, uio);
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else
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error = 0;
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if (buffer != NULL)
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free(buffer, M_TEMP);
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return error;
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}
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