| 1 | /*
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| 2 | * Copyright (c) 1995-2001 Kungliga Tekniska Högskolan
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| 3 | * (Royal Institute of Technology, Stockholm, Sweden).
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| 4 | * All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | *
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | *
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in the
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| 15 | * documentation and/or other materials provided with the distribution.
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| 16 | *
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| 17 | * 3. Neither the name of the Institute nor the names of its contributors
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| 18 | * may be used to endorse or promote products derived from this software
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| 19 | * without specific prior written permission.
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| 20 | *
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| 21 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 31 | * SUCH DAMAGE.
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| 32 | */
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| 33 |
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| 34 | #include <config.h>
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| 35 |
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| 36 | #include "roken.h"
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| 37 |
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| 38 | #ifdef HAVE_SYS_TYPES_H
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| 39 | #include <sys/types.h>
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| 40 | #endif
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| 41 | #ifdef TIME_WITH_SYS_TIME
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| 42 | #include <sys/time.h>
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| 43 | #include <time.h>
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| 44 | #elif defined(HAVE_SYS_TIME_H)
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| 45 | #include <sys/time.h>
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| 46 | #else
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| 47 | #include <time.h>
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| 48 | #endif
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| 49 | #ifdef HAVE_SYS_PARAM_H
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| 50 | #include <sys/param.h>
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| 51 | #endif
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| 52 | #ifdef HAVE_UNISTD_H
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| 53 | #include <unistd.h>
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| 54 | #endif
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| 55 |
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| 56 | #ifdef HAVE_SYS_RESOURCE_H
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| 57 | #include <sys/resource.h>
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| 58 | #endif
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| 59 |
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| 60 | #ifdef HAVE_SYS_SYSCTL_H
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| 61 | #include <sys/sysctl.h>
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| 62 | #endif
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| 63 |
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| 64 | ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
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| 65 | getdtablesize(void)
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| 66 | {
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| 67 | int files = -1;
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| 68 | #if defined(HAVE_SYSCONF) && defined(_SC_OPEN_MAX)
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| 69 | files = sysconf(_SC_OPEN_MAX);
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| 70 | #else /* !defined(HAVE_SYSCONF) */
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| 71 | #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
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| 72 | struct rlimit res;
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| 73 | if (getrlimit(RLIMIT_NOFILE, &res) == 0)
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| 74 | files = res.rlim_cur;
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| 75 | #else /* !definded(HAVE_GETRLIMIT) */
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| 76 | #if defined(HAVE_SYSCTL) && defined(CTL_KERN) && defined(KERN_MAXFILES)
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| 77 | int mib[2];
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| 78 | size_t len;
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| 79 |
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| 80 | mib[0] = CTL_KERN;
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| 81 | mib[1] = KERN_MAXFILES;
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| 82 | len = sizeof(files);
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| 83 | sysctl(&mib, 2, &files, sizeof(files), NULL, 0);
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| 84 | #endif /* defined(HAVE_SYSCTL) */
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| 85 | #endif /* !definded(HAVE_GETRLIMIT) */
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| 86 | #endif /* !defined(HAVE_SYSCONF) */
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| 87 |
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| 88 | #ifdef OPEN_MAX
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| 89 | if (files < 0)
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| 90 | files = OPEN_MAX;
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| 91 | #endif
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| 92 |
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| 93 | #ifdef NOFILE
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| 94 | if (files < 0)
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| 95 | files = NOFILE;
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| 96 | #endif
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| 97 |
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| 98 | return files;
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| 99 | }
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