/* $NetBSD: procfs_limit.c,v 1.4 2020/05/23 23:42:43 ad Exp $ */ /*- * Copyright (c) 2019 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Christos Zoulas. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: procfs_limit.c,v 1.4 2020/05/23 23:42:43 ad Exp $"); #include <sys/param.h> #include <sys/systm.h> #include <sys/proc.h> #include <sys/malloc.h> #include <sys/resource.h> #include <miscfs/procfs/procfs.h> #define MAXBUFFERSIZE (256 * 1024) static size_t prl(char *buf, size_t len, intmax_t lim, char sep) { if (lim == RLIM_INFINITY) return snprintf(buf, len, "%#20jx%c", lim, sep); else return snprintf(buf, len, "%20jd%c", lim, sep); } int procfs_dolimit(struct lwp *curl, struct proc *p, struct pfsnode *pfs, struct uio *uio) { static const char *label[] = RLIM_STRINGS; int error; char *buffer; size_t bufsize, pos, i; struct rlimit rl[RLIM_NLIMITS]; if (uio->uio_rw != UIO_READ) return EOPNOTSUPP; mutex_enter(&proc_lock); mutex_enter(p->p_lock); memcpy(rl, p->p_rlimit, sizeof(rl)); mutex_exit(p->p_lock); mutex_exit(&proc_lock); error = 0; bufsize = (64 * 3) * __arraycount(rl); buffer = malloc(bufsize, M_TEMP, M_WAITOK); pos = 0; for (i = 0; i < __arraycount(rl); i++) { pos += snprintf(buffer + pos, bufsize - pos, "%20.20s ", label[i]); pos += prl(buffer + pos, bufsize - pos, rl[i].rlim_cur, ' '); pos += prl(buffer + pos, bufsize - pos, rl[i].rlim_max, '\n'); } if ((uintmax_t)uio->uio_offset < pos) error = uiomove(buffer + uio->uio_offset, pos - uio->uio_offset, uio); else error = 0; if (buffer != NULL) free(buffer, M_TEMP); return error; } |