1 /* $NetBSD: procfs_limit.c,v 1.4 2020/05/23 23:42:43 ad Exp $ */ 2 3 /*- 4 * Copyright (c) 2019 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: procfs_limit.c,v 1.4 2020/05/23 23:42:43 ad Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/proc.h> 38 #include <sys/malloc.h> 39 #include <sys/resource.h> 40 #include <miscfs/procfs/procfs.h> 41 42 #define MAXBUFFERSIZE (256 * 1024) 43 44 static size_t 45 prl(char *buf, size_t len, intmax_t lim, char sep) 46 { 47 if (lim == RLIM_INFINITY) 48 return snprintf(buf, len, "%#20jx%c", lim, sep); 49 else 50 return snprintf(buf, len, "%20jd%c", lim, sep); 51 } 52 53 int 54 procfs_dolimit(struct lwp *curl, struct proc *p, struct pfsnode *pfs, 55 struct uio *uio) 56 { 57 static const char *label[] = RLIM_STRINGS; 58 int error; 59 char *buffer; 60 size_t bufsize, pos, i; 61 struct rlimit rl[RLIM_NLIMITS]; 62 63 if (uio->uio_rw != UIO_READ) 64 return EOPNOTSUPP; 65 66 mutex_enter(&proc_lock); 67 mutex_enter(p->p_lock); 68 memcpy(rl, p->p_rlimit, sizeof(rl)); 69 mutex_exit(p->p_lock); 70 mutex_exit(&proc_lock); 71 72 error = 0; 73 74 bufsize = (64 * 3) * __arraycount(rl); 75 buffer = malloc(bufsize, M_TEMP, M_WAITOK); 76 pos = 0; 77 for (i = 0; i < __arraycount(rl); i++) { 78 pos += snprintf(buffer + pos, bufsize - pos, "%20.20s ", 79 label[i]); 80 pos += prl(buffer + pos, bufsize - pos, rl[i].rlim_cur, ' '); 81 pos += prl(buffer + pos, bufsize - pos, rl[i].rlim_max, '\n'); 82 } 83 84 if ((uintmax_t)uio->uio_offset < pos) 85 error = uiomove(buffer + uio->uio_offset, 86 pos - uio->uio_offset, uio); 87 else 88 error = 0; 89 90 if (buffer != NULL) 91 free(buffer, M_TEMP); 92 93 return error; 94 } 95