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Rev Author # Line
1 perry 1 SYSCTL
2 !!!SYSCTL
3 NAME
4 SYNOPSIS
5 DESCRIPTION
6 EXAMPLE
7 RETURN VALUE
8 ERRORS
9 CONFORMING TO
10 BUGS
11 SEE ALSO
12 ----
13 !!NAME
14
15
16 sysctl - read/write system parameters
17 !!SYNOPSIS
18
19
20 __#include __
21
22
23 __#include __
24
25
26 __#include __
27
28
2 DashedDot 29 ___syscall1(int, _sysctl, struct __sysctl_args *, args);__
1 perry 30
31
32 __int _sysctl(struct __sysctl_args *__''args''__);
33
34 __!!DESCRIPTION
35
36
37 The ___sysctl__ call reads and/or writes kernel
38 parameters. For example, the hostname, or the maximum number
39 of open files. The argument has the form
40
41
2 DashedDot 42 struct __sysctl_args {
43 int *name; /* integer vector describing variable */
44 int nlen; /* length of this vector */
45 void *oldval; /* 0 or address where to store old value */
46 size_t *oldlenp; /* available room for old value, overwritten by actual size of old value */
47 void *newval; /* 0 or address of new value */
48 size_t newlen; /* size of new value */
49 };
50
51 This call does a search in a tree structure, possibly resembling a directory tree under __/proc/sys__,
52 and if the requested item is found calls some appropriate routine to read or modify the value.
53
1 perry 54 !!EXAMPLE
55
2 DashedDot 56 #include
1 perry 57
58 !!RETURN VALUE
59
60 Upon successful completion, ___sysctl__ returns 0.
61 Otherwise, a value of -1 is returned and ''errno'' is set
62 to indicate the error.
2 DashedDot 63
1 perry 64 !!ERRORS
65
66 __ENOTDIR__
67
68 ''name'' was not found.
69
70 __EPERM__
71
72 No search permission for one of the encountered
73 `directories', or no read permission where ''oldval'' was
74 nonzero, or no write permission where ''newval'' was
75 nonzero.
76
77 __EFAULT__
78
79 The invocation asked for the previous value by setting
80 ''oldval'' non-NULL, but allowed zero room in
81 ''oldlenp''.
82 !!CONFORMING TO
83
84
85 This call is Linux-specific, and should not be used in
86 programs intended to be portable. A __sysctl__ call has
87 been present in Linux since version 1.3.57. It originated in
88 4.4BSD. Only Linux has the ''/proc/sys'' mirror, and the
89 object naming schemes differ between Linux and BSD 4.4, but
90 the declaration of the sysctl(2) function is the same
91 in both.
92 !!BUGS
93
94
95 The object names vary between kernel versions. THIS MAKES
96 THIS SYSTEM CALL WORTHLESS FOR APPLICATIONS. Use the
97 ''/proc/sys'' interface instead.
98 Not all available objects are properly documented.
99 It is not yet possible to change operating system by writing
100 to ''/proc/sys/kernel/ostype''.
101 !!SEE ALSO
102
2 DashedDot 103 [Sysctl | http://man-wiki.net/index.php/2:sysctl]
1 perry 104
105 proc(5)
106 ----
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