102 lines
3.0 KiB
C
102 lines
3.0 KiB
C
/*
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* Copyright (c) 1995-2001 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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RCSID("$Id: getdtablesize.c,v 1.11 2001/06/20 00:00:38 joda Exp $");
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#endif
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#include "roken.h"
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef TIME_WITH_SYS_TIME
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#include <sys/time.h>
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#include <time.h>
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#elif defined(HAVE_SYS_TIME_H)
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#include <sys/time.h>
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#else
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#include <time.h>
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#endif
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#ifdef HAVE_SYS_PARAM_H
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#include <sys/param.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_SYS_RESOURCE_H
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#include <sys/resource.h>
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#endif
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#ifdef HAVE_SYS_SYSCTL_H
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#include <sys/sysctl.h>
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#endif
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int getdtablesize(void)
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{
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int files = -1;
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#if defined(HAVE_SYSCONF) && defined(_SC_OPEN_MAX)
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files = sysconf(_SC_OPEN_MAX);
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#else /* !defined(HAVE_SYSCONF) */
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#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
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struct rlimit res;
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if (getrlimit(RLIMIT_NOFILE, &res) == 0)
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files = res.rlim_cur;
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#else /* !definded(HAVE_GETRLIMIT) */
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#if defined(HAVE_SYSCTL) && defined(CTL_KERN) && defined(KERN_MAXFILES)
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int mib[2];
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size_t len;
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mib[0] = CTL_KERN;
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mib[1] = KERN_MAXFILES;
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len = sizeof(files);
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sysctl(&mib, 2, &files, sizeof(files), NULL, 0);
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#endif /* defined(HAVE_SYSCTL) */
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#endif /* !definded(HAVE_GETRLIMIT) */
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#endif /* !defined(HAVE_SYSCONF) */
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#ifdef OPEN_MAX
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if (files < 0)
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files = OPEN_MAX;
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#endif
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#ifdef NOFILE
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if (files < 0)
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files = NOFILE;
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#endif
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return files;
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}
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