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/*
* proc.c:
* interface to process table entry in /proc
*
* Copyright (C) 1997, 1998 by Raju Mathur (raju@sgi.com)
*
* See file COPYING (included in this distribution) for copyright information.
*/
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <dirent.h>
#include <sys/stat.h>
#include "common.h"
/*
* memory (in Kbytes)
*/
int
sysmem = 0 ,
kernelmem = 0 ,
freemem = 0 ,
buffermem = 0 ;
/*
* Set values for various memory usages
*/
static void
SetMemInfo ( void )
{
struct stat
s ;
char
buf [128] ;
FILE
*meminfo ;
int
totalmem ;
const char
*MemLine = "Mem:" ;
const int
MemLineLen = strlen ( MemLine ) ;
/*
* Cheap way to get amount of installed mem in the computer -- get size of
* /proc/kcore.
*/
if ( stat ( "/proc/kcore" , &s ) < 0 )
{
fprintf ( stderr , "%s: cannot stat /proc/kcore" , progname ) ;
perror ( "" ) ;
exit ( 1 ) ;
}
sysmem = s . st_size ; /* in Kilobytes */
/*
* Read /proc/meminfo to get usable memory and buffers. Presumably buffers
* should be considered a part of the kernel memory.
*/
if ( ( meminfo = fopen ( "/proc/meminfo" , "r" ) ) == NULL )
{
fprintf ( stderr , "%s: cannot open /proc/meminfo" , progname ) ;
perror ( "" ) ;
exit ( 1 ) ;
}
while ( fgets ( buf , sizeof ( buf ) , meminfo ) )
{
if ( !strncmp ( buf , MemLine , MemLineLen ) )
{
/* Mem: total used free shared buffers cached */
sscanf ( buf , "%*s %d %*d %d %*d %d" , &totalmem , &freemem ,
&buffermem ) ;
break ;
}
}
sysmem /= 1024 ;
totalmem /= 1024 ;
freemem /= 1024 ;
buffermem /= 1024 ;
kernelmem = sysmem - totalmem ;
fclose ( meminfo ) ;
return ;
}
/*
* Read /proc to get info about processes.
* As a side effect :-) also set variables related to main memory.
*/
void
makeProcs ( void )
{
DIR
*proc ;
struct dirent
*procdir ;
FILE
*StatusFile ;
char
buf [128] ;
char
procName [14] ;
int
procSize ,
procRSS ,
procData ,
procStk ,
procExe ;
const char
*NameLine = "Name:" ,
*VmSizeLine = "VmSize:" ,
*VmRSSLine = "VmRSS" ,
*VmDataLine = "VmData" ,
*VmStkLine = "VmStk" ,
*VmExeLine = "VmExe" ;
const int
NameLineLen = strlen ( NameLine ) ,
VmSizeLineLen = strlen ( VmSizeLine ) ,
VmDataLineLen = strlen ( VmDataLine ) ,
VmStkLineLen = strlen ( VmStkLine ) ,
VmExeLineLen = strlen ( VmExeLine ) ,
VmRSSLineLen = strlen ( VmRSSLine ) ;
if ( ( proc = opendir ( "/proc" ) ) == NULL )
{
fprintf ( stderr , "%s: unable to open /proc" , progname ) ;
perror ( "" ) ;
exit ( 1 ) ;
}
ClearProcs () ;
/*
* Get memory info
*/
SetMemInfo () ;
/*
* Make sure that the first process is the kernel. We'll be slightly off,
* but the alternatives (adding this after the rest of the process list
* has been made) are too terrible to contemplate.
*/
addProc ( kernelname , kernelmem + buffermem , kernelmem + buffermem ) ;
/*
* NASTY HACK!
* Some screwy feature (or my screwy understanding of /proc) causes the
* sum(RSS) for all the procs + kernel + buffers + freemem to become > system
* memory. Hence we recalculate system memory based on the actual figures
* we get from sum(RSS)+kernel+buffers+freemem
*/
sysmem = 0 ;
while ( procdir = readdir ( proc ) )
{
if ( !index ( "1234567890" , procdir -> d_name [0] ) )
{
continue ;
}
sprintf ( buf , "/proc/%s/status" , procdir -> d_name ) ;
if ( ( StatusFile = fopen ( buf , "r" ) ) == NULL )
{
fprintf ( stderr , "%s: cannot open %s for reading" ,
progname , buf ) ;
perror ( "" ) ;
continue ;
}
procRSS = procSize = procData = procStk = procExe = 0 ;
while ( fgets ( buf , sizeof ( buf ) , StatusFile ) )
{
/*
* I hate sscanf's, but am too lazy to replace them with a more elegant,
* more efficient method right now. Don't you just love TODO lists?
*/
if ( !strncmp ( buf , NameLine , NameLineLen ) )
{
/* Name: procName */
sscanf ( buf , "%*s %s" , procName ) ;
}
else if ( !strncmp ( buf , VmSizeLine , VmSizeLineLen ) )
{
/* VmSize: procSize kB */
sscanf ( buf , "%*s %d" , &procSize ) ;
}
else if ( !strncmp ( buf , VmRSSLine , VmRSSLineLen ) )
{
/* VmRSS: procRSS kB */
sscanf ( buf , "%*s %d" , &procRSS ) ;
}
else if ( !strncmp ( buf , VmDataLine , VmDataLineLen ) )
{
/* VmData: procData kB */
sscanf ( buf , "%*s %d" , &procData ) ;
}
else if ( !strncmp ( buf , VmStkLine , VmStkLineLen ) )
{
/* VmStk: procStk kB */
sscanf ( buf , "%*s %d" , &procStk ) ;
}
else if ( !strncmp ( buf , VmExeLine , VmExeLineLen ) )
{
/* VmExe: procExe kB */
sscanf ( buf , "%*s %d" , &procExe ) ;
}
}
fclose ( StatusFile ) ;
addProc ( procName , procSize , procData + procStk + procExe ) ;
sysmem += procData + procStk + procExe ;
}
closedir ( proc ) ;
sysmem += kernelmem + buffermem + freemem ;
addProc ( freename , freemem , freemem ) ;
return ;
} /* makeProcs */
#ifdef DEBUG
void
printProcs ( void )
{
struct ProcInfo
*pi ,
*procs ;
int
nprocs ,
nprocs2 ,
totmem ;
register int
i ;
printf ( "%-20s%8s%8s%8s\n" , "Name" , "Memory" , "RSS" , "Number" ) ;
totmem = nprocs2 = 0 ;
procs = AllProcs ( &nprocs ) ;
for ( i = 0 ; i < nprocs ; i++ )
{
pi = &procs[i] ;
printf ( "%-20s%8d%8d%8d\n" , pi -> procname , pi -> totMem ,
pi -> totRSS , pi -> nProcs ) ;
nprocs2 += pi -> nProcs ;
if ( strcmp ( pi -> procname , kernelname ) )
{
totmem += pi -> totRSS ;
}
}
printf ( "%d procs\n" , nprocs ) ;
printf ( "Mem: %d procs, %d total, %d kernel, %d buffers, %d free\n" ,
totmem , sysmem , kernelmem , buffermem , freemem ) ;
}
char *progname ;
void
main ( int argc , char **argv )
{
register int i = 0 ;
progname = *argv ;
while ( 1 )
{
makeProcs () ;
printProcs () ;
printf ( "\n" ) ;
sleep ( 5 ) ;
}
}
#endif /* DEBUG */
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