1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
/*
* Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/limits.h>
#include <stdint.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
struct sysvar {
const char *var;
uint8_t auxv : 1;
uint8_t val;
};
static struct sysvar vartab[] = {
{ "PAGESIZE", 1, AT_PAGESIZE },
{ "CHAR_BIT", 0, CHAR_BIT },
{ NULL, 0, 0 }
};
static int
getvar_val(struct sysvar *vp)
{
if (vp->auxv) {
return sysconf(vp->val);
}
return vp->val;
}
static int
getvar(const char *sysvar)
{
for (int i = 0; vartab[i].var != NULL; ++i) {
if (strcmp(vartab[i].var, sysvar) == 0) {
return getvar_val(&vartab[i]);
}
}
return -1;
}
int
main(int argc, char **argv)
{
char *var;
int retval;
if (argc < 2) {
printf("usage: getconf <SYSTEM VAR>\n");
return -1;
}
var = argv[1];
if ((retval = getvar(var)) < 0) {
printf("bad system var \"%s\"\n", var);
return retval;
}
printf("%d\n", retval);
return 0;
}
|
