1 /* $NetBSD: getdtablesize.c,v 1.1.1.1 2011/04/13 18:15:41 elric Exp $ */ 2 3 /* 4 * Copyright (c) 1995-2001 Kungliga Tekniska Högskolan 5 * (Royal Institute of Technology, Stockholm, Sweden). 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 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 * 3. Neither the name of the Institute nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <config.h> 37 38 #include <krb5/roken.h> 39 40 #ifdef HAVE_SYS_TYPES_H 41 #include <sys/types.h> 42 #endif 43 #ifdef TIME_WITH_SYS_TIME 44 #include <sys/time.h> 45 #include <time.h> 46 #elif defined(HAVE_SYS_TIME_H) 47 #include <sys/time.h> 48 #else 49 #include <time.h> 50 #endif 51 #ifdef HAVE_SYS_PARAM_H 52 #include <sys/param.h> 53 #endif 54 #ifdef HAVE_UNISTD_H 55 #include <unistd.h> 56 #endif 57 58 #ifdef HAVE_SYS_RESOURCE_H 59 #include <sys/resource.h> 60 #endif 61 62 #ifdef HAVE_SYS_SYSCTL_H 63 #include <sys/sysctl.h> 64 #endif 65 66 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL 67 getdtablesize(void) 68 { 69 int files = -1; 70 #if defined(HAVE_SYSCONF) && defined(_SC_OPEN_MAX) 71 files = sysconf(_SC_OPEN_MAX); 72 #else /* !defined(HAVE_SYSCONF) */ 73 #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE) 74 struct rlimit res; 75 if (getrlimit(RLIMIT_NOFILE, &res) == 0) 76 files = res.rlim_cur; 77 #else /* !definded(HAVE_GETRLIMIT) */ 78 #if defined(HAVE_SYSCTL) && defined(CTL_KERN) && defined(KERN_MAXFILES) 79 int mib[2]; 80 size_t len; 81 82 mib[0] = CTL_KERN; 83 mib[1] = KERN_MAXFILES; 84 len = sizeof(files); 85 sysctl(&mib, 2, &files, sizeof(files), NULL, 0); 86 #endif /* defined(HAVE_SYSCTL) */ 87 #endif /* !definded(HAVE_GETRLIMIT) */ 88 #endif /* !defined(HAVE_SYSCONF) */ 89 90 #ifdef OPEN_MAX 91 if (files < 0) 92 files = OPEN_MAX; 93 #endif 94 95 #ifdef NOFILE 96 if (files < 0) 97 files = NOFILE; 98 #endif 99 100 return files; 101 } 102