1 | /* |
2 | KSysGuard, the KDE System Guard |
3 | |
4 | Copyright (c) 1999, 2000 Chris Schlaeger <cs@kde.org> |
5 | |
6 | This program is free software; you can redistribute it and/or |
7 | modify it under the terms of version 2 of the GNU General Public |
8 | License as published by the Free Software Foundation. |
9 | |
10 | This program is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | GNU General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU General Public License |
16 | along with this program; if not, write to the Free Software |
17 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
18 | |
19 | */ |
20 | |
21 | #include <sys/types.h> |
22 | #include <sys/stat.h> |
23 | #include <fcntl.h> |
24 | #include <unistd.h> |
25 | #include <stdio.h> |
26 | |
27 | #include "ksysguardd.h" |
28 | #include "Command.h" |
29 | |
30 | #include "loadavg.h" |
31 | |
32 | static int LoadAvgOK = 0; |
33 | static double LoadAvg1, LoadAvg5, LoadAvg15; |
34 | |
35 | #define LOADAVGBUFSIZE 128 |
36 | static char LoadAvgBuf[ LOADAVGBUFSIZE ]; |
37 | static int Dirty = 0; |
38 | |
39 | static void processLoadAvg( void ) |
40 | { |
41 | sscanf( LoadAvgBuf, "%lf %lf %lf" , &LoadAvg1, &LoadAvg5, &LoadAvg15 ); |
42 | Dirty = 0; |
43 | } |
44 | |
45 | /* |
46 | ================================ public part ================================= |
47 | */ |
48 | |
49 | void initLoadAvg( struct SensorModul* sm ) |
50 | { |
51 | if ( updateLoadAvg() < 0 ) { |
52 | LoadAvgOK = -1; |
53 | return; |
54 | } else |
55 | LoadAvgOK = 1; |
56 | |
57 | registerMonitor( "cpu/system/loadavg1" , "float" , printLoadAvg1, printLoadAvg1Info, sm ); |
58 | registerMonitor( "cpu/system/loadavg5" , "float" , printLoadAvg5, printLoadAvg5Info, sm ); |
59 | registerMonitor( "cpu/system/loadavg15" , "float" , printLoadAvg15, printLoadAvg15Info, sm ); |
60 | |
61 | /* Register some legacy monitors. These will be hidden from the module list. */ |
62 | registerLegacyMonitor( "cpu/loadavg1" , "float" , printLoadAvg1, printLoadAvg1Info, sm ); |
63 | registerLegacyMonitor( "cpu/loadavg5" , "float" , printLoadAvg5, printLoadAvg5Info, sm ); |
64 | registerLegacyMonitor( "cpu/loadavg15" , "float" , printLoadAvg15, printLoadAvg15Info, sm ); |
65 | } |
66 | |
67 | void exitLoadAvg( void ) |
68 | { |
69 | LoadAvgOK = -1; |
70 | } |
71 | |
72 | int updateLoadAvg( void ) |
73 | { |
74 | size_t n; |
75 | int fd; |
76 | |
77 | if ( LoadAvgOK < 0 ) |
78 | return -1; |
79 | |
80 | if ( ( fd = open( "/proc/loadavg" , O_RDONLY ) ) < 0 ) { |
81 | if ( LoadAvgOK != 0 ) |
82 | print_error( "Cannot open file \'/proc/loadavg\'!\n" |
83 | "The kernel needs to be compiled with support\n" |
84 | "for /proc file system enabled!\n" ); |
85 | return -1; |
86 | } |
87 | |
88 | n = read( fd, LoadAvgBuf, LOADAVGBUFSIZE - 1 ); |
89 | if ( n == LOADAVGBUFSIZE - 1 || n <= 0 ) { |
90 | log_error( "Internal buffer too small to read \'/proc/loadavg\'" ); |
91 | |
92 | close( fd ); |
93 | return -1; |
94 | } |
95 | |
96 | close( fd ); |
97 | LoadAvgBuf[ n ] = '\0'; |
98 | Dirty = 1; |
99 | |
100 | return 0; |
101 | } |
102 | |
103 | void printLoadAvg1( const char* cmd ) |
104 | { |
105 | (void)cmd; |
106 | |
107 | if ( Dirty ) |
108 | processLoadAvg(); |
109 | |
110 | output( "%f\n" , LoadAvg1 ); |
111 | } |
112 | |
113 | void printLoadAvg1Info( const char* cmd ) |
114 | { |
115 | (void)cmd; |
116 | output( "Load average 1 min\t0\t0\t\n" ); |
117 | } |
118 | |
119 | void printLoadAvg5( const char* cmd ) |
120 | { |
121 | (void)cmd; |
122 | |
123 | if ( Dirty ) |
124 | processLoadAvg(); |
125 | |
126 | output( "%f\n" , LoadAvg5 ); |
127 | } |
128 | |
129 | void printLoadAvg5Info( const char* cmd ) |
130 | { |
131 | (void)cmd; |
132 | output( "Load average 5 min\t0\t0\t\n" ); |
133 | } |
134 | |
135 | void printLoadAvg15( const char* cmd ) |
136 | { |
137 | (void)cmd; |
138 | |
139 | if ( Dirty ) |
140 | processLoadAvg(); |
141 | |
142 | output( "%f\n" , LoadAvg15 ); |
143 | } |
144 | |
145 | void printLoadAvg15Info( const char* cmd ) |
146 | { |
147 | (void)cmd; |
148 | output( "Load average 15 min\t0\t0\t\n" ); |
149 | } |
150 | |