On Wed, 5 Jun 2002 23:40:55 +0300, Yedidyah Bar-David <[EMAIL PROTECTED]> wrote:
>
> On Wed, Jun 05, 2002 at 09:55:42PM +0200, [EMAIL PROTECTED] wrote:
> >
> > Which system calls can provide me detailed information (structures is preferable)
>on RedHat 7.2 regarding:
> >
> > 1. Memory usage (similar to the info inculded in /proc/meminfo)
> > 2. CPU usage (SMP configuration - both CPUs, similar to the info we can get from
>"gtop")
>
> Simply go ahead and read /proc/*. This is _the_ interface.
I have written some functions that get part of the information you want.
It works (debugged) on RH versions 6.0 to 7.3 (kernels 2.2.5 - 2.4.18).
Take whatever you like.
Ehud.
#define BUFLNG 200 /* to allow lines of 200 chars */
unsigned char buf [ BUFLNG + 3 ] ; /* tcp/ip read/write buffer */
int get_cpu_count ( void ) /* return no. of cpus on this
system */
{
#ifndef __linux__
return ( 1 ) ; /* assume 1 processor */
#else /* NOT __linux__ */
FILE *fd ;
int load_cpu_cnt = 1 ; /* start with 1 */
if ( ( fd = fopen ( "/proc/stat" , "r" ) ) == NULL ) /* /proc/stat must be found
*/
return ( 1 ) ; /* assume 1 processor */
fgets ( buf , BUFLNG , fd ) ; /* 1st line, accumulated cpu */
while ( strncmp ( buf , "cpu" , 3 ) == 0 ) /* count cpu lines */
{
load_cpu_cnt ++ ;
if ( fgets ( buf , BUFLNG , fd ) == NULL )
*buf = 0 ;
}
fclose ( fd ) ;
load_cpu_cnt -= 2 ; /* extra 2 lines (cpu , cpu0) */
if ( load_cpu_cnt < 1 ) /* correct for possible 0 */
load_cpu_cnt = 1 ;
return ( load_cpu_cnt ) ; /* no. of cpus */
#endif /* __linux__ */
}
/* ======================================================================== */
void get_cpu_pgs ( long *cpu , long *pgs ) /* get cpu avg * 100 & pages I/O *
10 */
{
#ifdef __CYGWIN__
*cpu = 0 ; /* NO cpu avg on PC */
*pgs = 0 ; /* NO pages IO on PC */
#else /* __CYGWIN__ */
FILE *fl ; /* "/proc/stat" handle */
unsigned long tmp , tmp1 , tmp2 ; /* cpu, pages temp */
static int sv_cpu = 0 , sv_pgs = 0 , ncpus = 0 ; /* saved cpu, pages, no. of cpus */
static time_t crnt, last = 0 ;
if ( ! ncpus ) /* ncpus not set ? */
ncpus = get_cpu_count ( ) ; /* set it now */
time (& crnt) ; /* get gmt seconds from 1/1/1970 */
crnt -= last ; /* ignore 1st time */
last += crnt ; /* for next time */
if ( ( fl = fopen ( "/proc/stat" , "r" ) ) == NULL )/* /proc/stat must be found */
error_msg ( "Open of /proc/stat failed" , 6 ) ; /* error message, exit */
if ( fgets ( buf , BUFLNG , fl ) == NULL ) /* 1st record is cpu <user> <nice>
<sys> <idle> */
error_msg ( "1st read of /proc/stat failed" , 7 ) ; /* error message, exit */
sscanf ( buf , "%*s %lu %lu %lu" , &tmp , &tmp1 , &tmp2 ) ;
tmp = ( tmp + tmp1 + tmp2 ) * 10 ; /* total cpu used * 100 */
tmp1 = ( tmp - sv_cpu ) / ( crnt * ncpus ) ; /* cpu avg for the time elapsed */
if ( tmp1 > 999 )
tmp1 = 999 ; /* max value allowed */
*cpu = htonl ( tmp1 ) ; /* cpu avg * 1000 [0-999] */
sv_cpu = tmp ; /* for next time */
while ( fgets ( buf , BUFLNG , fl ) != NULL ) /* next record of /proc/stat */
{
if ( strncmp ( buf , "page " , 5 ) != 0 ) /* is it page IO line ? */
continue ; /* NO */
sscanf ( buf , "%*s %lu %lu" , &tmp , &tmp1 ) ; /* IN pages, OUT pages */
tmp = ( tmp + tmp1 ) << 4 ; /* total pages IO * 16 */
*pgs = htonl ( ( tmp - sv_pgs ) / crnt ) ; /* pages avg * 10 for the time
elapsed */
sv_pgs = tmp ; /* for next time */
fclose ( fl ) ; /* end of /proc/stat processing */
return ; /* all OK */
}
error_msg ( "PAGES record of /proc/stat not found" , 8 ) ; /* error message, exit */
#endif /* __CYGWIN__ */
}
/*===========================================================================*/
void get_ld_procs ( long *ld_avg , long *procs ) /* get load avg & no. of procs */
{
#if __linux__
struct sysinfo si ; /* sys info values */
if ( sysinfo ( & si ) < 0 ) /* get sysinfo - must be successful
*/
error_msg ( "System error, sysinfo failed" , 5 ) ; /* error message, exit */
*ld_avg = htonl ( ( si . loads [0] + 128 ) >> 8 ) ; /* load average * 256 */
*procs = htonl ( si . procs ) ; /* no. of procs */
#else /* __linux__ */
*ld_avg = 0 ; /* no load average */
*procs = 0 ; /* no proc count */
#endif /* __linux__ */
}
/*===========================================================================*/
long get_users ( void ) /* no. of logins */
{
#ifdef __CYGWIN__
return ( 1 ) ; /* always 1 user on PC */
#else /* __CYGWIN__ */
long users = 0 ; /* users (logins) count */
struct utmp *U ; /* utmp entry */
setutent ( ) ; /* rewind the utmp file */
while ( ( U = getutent ( ) ) != NULL ) /* next utmp entry */
if ( ( U -> ut_type == USER_PROCESS ) && /* real user */
( * ( U -> ut_user ) != 0 ) ) /* not exited */
users ++ ; /* increase users number */
return ( users ) ;
#endif /* __CYGWIN__ */
}
/*===========================================================================*/
--
Ehud Karni Tel: +972-3-7966-561 /"\
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