1 /* 2 * Copyright (c) 2004 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Joerg Sonnenberger <joerg@bec.de>. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * $DragonFly: src/lib/libkinfo/kinfo_file.c,v 1.3 2004/12/04 00:34:36 joerg Exp $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/sysctl.h> 39 40 #include <err.h> 41 #include <errno.h> 42 #include <kinfo.h> 43 #include <stdlib.h> 44 45 #define KERN_FILE_SYSCTL "kern.file" 46 47 int 48 kinfo_get_files(struct kinfo_file **file_buf, size_t *len) 49 { 50 int retval; 51 void *buf; 52 size_t new_len; 53 54 retval = sysctlbyname(KERN_FILE_SYSCTL, NULL, &new_len, NULL, 0); 55 if (retval) 56 return(retval); 57 if ((buf = malloc(new_len)) == NULL) 58 return(ENOMEM); 59 retval = sysctlbyname(KERN_FILE_SYSCTL, buf, &new_len, NULL, 0); 60 if (retval) { 61 free(buf); 62 return(retval); 63 } 64 /* 65 * Shrink the buffer to the minimum size, this is not supposed 66 * to fail. 67 */ 68 if ((buf = reallocf(buf, new_len)) == NULL) 69 err(1, "realloc"); 70 if (new_len != 0 && 71 ((struct kinfo_file *)buf)->f_size != sizeof(struct kinfo_file)) { 72 warnx("kernel size of struct kinfo_file changed"); 73 free(buf); 74 return(EOPNOTSUPP); 75 } 76 *len = new_len / sizeof(struct kinfo_file); 77 *file_buf = buf; 78 return(0); 79 } 80 81 /* XXX convert kern.maxfiles to size_t */ 82 int 83 kinfo_get_maxfiles(int *maxfiles) 84 { 85 int len = sizeof(*maxfiles); 86 87 return(sysctlbyname("kern.maxfiles", maxfiles, &len, NULL, 0)); 88 } 89 90 /* XXX convert kern.openfiles to size_t */ 91 int 92 kinfo_get_openfiles(int *openfiles) 93 { 94 int len = sizeof(*openfiles); 95 96 return(sysctlbyname("kern.openfiles", openfiles, &len, NULL, 0)); 97 } 98