turn off v4 conversion stuff
[heimdal.git] / lib / roken / getdtablesize.c
bloba515af34545018a85f411b2c3b5e160761f38b90
1 /*
2 * Copyright (c) 1995-2001 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * 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 the
15 * documentation and/or other materials provided with the distribution.
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.
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.
34 #include <config.h>
36 #include "roken.h"
38 #ifdef HAVE_SYS_TYPES_H
39 #include <sys/types.h>
40 #endif
41 #ifdef TIME_WITH_SYS_TIME
42 #include <sys/time.h>
43 #include <time.h>
44 #elif defined(HAVE_SYS_TIME_H)
45 #include <sys/time.h>
46 #else
47 #include <time.h>
48 #endif
49 #ifdef HAVE_SYS_PARAM_H
50 #include <sys/param.h>
51 #endif
52 #ifdef HAVE_UNISTD_H
53 #include <unistd.h>
54 #endif
56 #ifdef HAVE_SYS_RESOURCE_H
57 #include <sys/resource.h>
58 #endif
60 #ifdef HAVE_SYS_SYSCTL_H
61 #include <sys/sysctl.h>
62 #endif
64 int ROKEN_LIB_FUNCTION
65 getdtablesize(void)
67 int files = -1;
68 #if defined(HAVE_SYSCONF) && defined(_SC_OPEN_MAX)
69 files = sysconf(_SC_OPEN_MAX);
70 #else /* !defined(HAVE_SYSCONF) */
71 #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
72 struct rlimit res;
73 if (getrlimit(RLIMIT_NOFILE, &res) == 0)
74 files = res.rlim_cur;
75 #else /* !definded(HAVE_GETRLIMIT) */
76 #if defined(HAVE_SYSCTL) && defined(CTL_KERN) && defined(KERN_MAXFILES)
77 int mib[2];
78 size_t len;
80 mib[0] = CTL_KERN;
81 mib[1] = KERN_MAXFILES;
82 len = sizeof(files);
83 sysctl(&mib, 2, &files, sizeof(files), NULL, 0);
84 #endif /* defined(HAVE_SYSCTL) */
85 #endif /* !definded(HAVE_GETRLIMIT) */
86 #endif /* !defined(HAVE_SYSCONF) */
88 #ifdef OPEN_MAX
89 if (files < 0)
90 files = OPEN_MAX;
91 #endif
93 #ifdef NOFILE
94 if (files < 0)
95 files = NOFILE;
96 #endif
98 return files;