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Diffstat (limited to 'ksysguard/ksysguardd/Linux/Memory.c')
| -rw-r--r-- | ksysguard/ksysguardd/Linux/Memory.c | 293 |
1 files changed, 293 insertions, 0 deletions
diff --git a/ksysguard/ksysguardd/Linux/Memory.c b/ksysguard/ksysguardd/Linux/Memory.c new file mode 100644 index 000000000..93c8d9edb --- /dev/null +++ b/ksysguard/ksysguardd/Linux/Memory.c @@ -0,0 +1,293 @@ +/* + KSysGuard, the KDE System Guard + + Copyright (c) 1999 - 2001 Chris Schlaeger <cs@kde.org> + + This program is free software; you can redistribute it and/or + modify it under the terms of version 2 of the GNU General Public + License as published by the Free Software Foundation. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + +*/ + +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <unistd.h> +#include <stdlib.h> +#include <stdio.h> +#include <string.h> + +#include "Command.h" +#include "ksysguardd.h" + +#include "Memory.h" + +#define MEMINFOBUFSIZE (2 * 1024) + +static char MemInfoBuf[ MEMINFOBUFSIZE ]; +static int Dirty = 1; + +static unsigned long Total = 0; +static unsigned long MFree = 0; +static unsigned long Appl = 0; +static unsigned long Used = 0; +static unsigned long Buffers = 0; +static unsigned long Cached = 0; +static unsigned long STotal = 0; +static unsigned long SFree = 0; +static unsigned long SUsed = 0; + +static void scan_one( const char* buff, const char *key, unsigned long int* val ) +{ + int o; + char *b = strstr( buff, key ); + if ( b ) + o = sscanf( b + strlen( key ), ": %lu", val ); +} + +static void processMemInfo() +{ + scan_one( MemInfoBuf, "MemTotal", &Total ); + scan_one( MemInfoBuf, "MemFree", &MFree ); + scan_one( MemInfoBuf, "Buffers", &Buffers ); + scan_one( MemInfoBuf, "Cached", &Cached ); + scan_one( MemInfoBuf, "SwapTotal", &STotal ); + scan_one( MemInfoBuf, "SwapFree", &SFree ); + Used = Total - MFree; + Appl = ( Used - ( Buffers + Cached ) ); + + if ( STotal == 0 ) /* no swap activated */ + SUsed = 0; + else + SUsed = STotal - SFree; + + Dirty = 0; +} + +/* +================================ public part ================================= +*/ + +void initMemory( struct SensorModul* sm ) +{ + /** + Make sure that /proc/meminfo exists and is readable. If not we do + not register any monitors for memory. + */ + if ( updateMemory() < 0 ) + return; + + registerMonitor( "mem/physical/free", "integer", printMFree, printMFreeInfo, sm ); + registerMonitor( "mem/physical/used", "integer", printUsed, printUsedInfo, sm ); + registerMonitor( "mem/physical/application", "integer", printAppl, printApplInfo, sm ); + registerMonitor( "mem/physical/buf", "integer", printBuffers, printBuffersInfo, sm ); + registerMonitor( "mem/physical/cached", "integer", printCached, printCachedInfo, sm ); + registerMonitor( "mem/swap/used", "integer", printSwapUsed, printSwapUsedInfo, sm ); + registerMonitor( "mem/swap/free", "integer", printSwapFree, printSwapFreeInfo, sm ); +} + +void exitMemory( void ) +{ +} + +int updateMemory( void ) +{ + /** + The amount of total and used memory is read from the /proc/meminfo. + It also contains the information about the swap space. + The 'file' looks like this: + + MemTotal: 516560 kB + MemFree: 7812 kB + MemShared: 0 kB + Buffers: 80312 kB + Cached: 236432 kB + SwapCached: 468 kB + Active: 291992 kB + Inactive: 133556 kB + HighTotal: 0 kB + HighFree: 0 kB + LowTotal: 516560 kB + LowFree: 7812 kB + SwapTotal: 899632 kB + SwapFree: 898932 kB + Dirty: 2736 kB + Writeback: 0 kB + Mapped: 155996 kB + Slab: 73920 kB + Committed_AS: 315588 kB + PageTables: 1764 kB + ReverseMaps: 103458 + */ + + int fd; + size_t n; + + if ( ( fd = open( "/proc/meminfo", O_RDONLY ) ) < 0 ) { + print_error( "Cannot open \'/proc/meminfo\'!\n" + "The kernel needs to be compiled with support\n" + "for /proc filesystem enabled!\n" ); + return -1; + } + + if ( ( n = read( fd, MemInfoBuf, MEMINFOBUFSIZE - 1 ) ) == MEMINFOBUFSIZE - 1 ) { + log_error( "Internal buffer too small to read \'/proc/mem\'" ); + close( fd ); + return -1; + } + + close( fd ); + MemInfoBuf[ n ] = '\0'; + Dirty = 1; + + return 0; +} + +void printMFree( const char* cmd ) +{ + (void)cmd; + + if ( Dirty ) + processMemInfo(); + + fprintf( CurrentClient, "%ld\n", MFree ); +} + +void printMFreeInfo( const char* cmd ) +{ + (void)cmd; + + if ( Dirty ) + processMemInfo(); + + fprintf( CurrentClient, "Free Memory\t0\t%ld\tKB\n", Total ); +} + +void printUsed( const char* cmd ) +{ + (void)cmd; + + if ( Dirty ) + processMemInfo(); + + fprintf( CurrentClient, "%ld\n", Used ); +} + +void printUsedInfo( const char* cmd ) +{ + (void)cmd; + + if ( Dirty ) + processMemInfo(); + + fprintf( CurrentClient, "Used Memory\t0\t%ld\tKB\n", Total ); +} + +void printAppl( const char* cmd ) +{ + (void)cmd; + + if ( Dirty ) + processMemInfo(); + + fprintf( CurrentClient, "%ld\n", Appl ); +} + +void printApplInfo( const char* cmd ) +{ + (void)cmd; + + if ( Dirty ) + processMemInfo(); + + fprintf( CurrentClient, "Application Memory\t0\t%ld\tKB\n", Total ); +} + +void printBuffers( const char* cmd ) +{ + (void)cmd; + + if ( Dirty ) + processMemInfo(); + + fprintf( CurrentClient, "%ld\n", Buffers ); +} + +void printBuffersInfo( const char* cmd ) +{ + (void)cmd; + + if ( Dirty ) + processMemInfo(); + + fprintf( CurrentClient, "Buffer Memory\t0\t%ld\tKB\n", Total ); +} + +void printCached( const char* cmd ) +{ + (void)cmd; + + if ( Dirty ) + processMemInfo(); + + fprintf( CurrentClient, "%ld\n", Cached ); +} + +void printCachedInfo( const char* cmd ) +{ + (void)cmd; + + if ( Dirty ) + processMemInfo(); + + fprintf( CurrentClient, "Cached Memory\t0\t%ld\tKB\n", Total ); +} + +void printSwapUsed( const char* cmd ) +{ + (void)cmd; + + if ( Dirty ) + processMemInfo(); + + fprintf( CurrentClient, "%ld\n", SUsed ); +} + +void printSwapUsedInfo( const char* cmd ) +{ + (void)cmd; + + if ( Dirty ) + processMemInfo(); + + fprintf( CurrentClient, "Used Swap Memory\t0\t%ld\tKB\n", STotal ); +} + +void printSwapFree( const char* cmd ) +{ + (void)cmd; + + if ( Dirty ) + processMemInfo(); + + fprintf( CurrentClient, "%ld\n", SFree ); +} + +void printSwapFreeInfo( const char* cmd ) +{ + (void)cmd; + + if ( Dirty ) + processMemInfo(); + + fprintf( CurrentClient, "Free Swap Memory\t0\t%ld\tKB\n", STotal ); +} |