Branch data Line data Source code
1 : : /*
2 : : * Copyright (c) 1995-2001 Kungliga Tekniska Högskolan
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 : : #include <config.h>
35 : :
36 : : #include "roken.h"
37 : :
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
55 : :
56 : : #ifdef HAVE_SYS_RESOURCE_H
57 : : #include <sys/resource.h>
58 : : #endif
59 : :
60 : : #ifdef HAVE_SYS_SYSCTL_H
61 : : #include <sys/sysctl.h>
62 : : #endif
63 : :
64 : : ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
65 : 0 : getdtablesize(void)
66 : : {
67 : 0 : int files = -1;
68 : : #if defined(HAVE_SYSCONF) && defined(_SC_OPEN_MAX)
69 : 0 : 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;
79 : :
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) */
87 : :
88 : : #ifdef OPEN_MAX
89 : : if (files < 0)
90 : : files = OPEN_MAX;
91 : : #endif
92 : :
93 : : #ifdef NOFILE
94 [ # # ]: 0 : if (files < 0)
95 : 0 : files = NOFILE;
96 : : #endif
97 : :
98 : 0 : return files;
99 : : }
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