1 /* 2 * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska H�gskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifdef HAVE_CONFIG_H 35 #include <config.h> 36 RCSID("$Id: getdtablesize.c,v 1.10 1999/12/02 16:58:46 joda Exp $"); 37 #endif 38 39 #include "roken.h" 40 41 #ifdef HAVE_SYS_TYPES_H 42 #include <sys/types.h> 43 #endif 44 #ifdef TIME_WITH_SYS_TIME 45 #include <sys/time.h> 46 #include <time.h> 47 #elif defined(HAVE_SYS_TIME_H) 48 #include <sys/time.h> 49 #else 50 #include <time.h> 51 #endif 52 #ifdef HAVE_SYS_PARAM_H 53 #include <sys/param.h> 54 #endif 55 #ifdef HAVE_UNISTD_H 56 #include <unistd.h> 57 #endif 58 59 #ifdef HAVE_SYS_RESOURCE_H 60 #include <sys/resource.h> 61 #endif 62 63 #ifdef HAVE_SYS_SYSCTL_H 64 #include <sys/sysctl.h> 65 #endif 66 67 int 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(nfil), 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