ihost/libstatgrab/cpu_stats.c

#include <stdio.h>
#include <local/ukcprog.h>
#include <unistd.h>

#define WAIT_TIME_IN_SECS 1
char *get_cpu_stats(){
                double u_p, i_p, k_p;
#ifdef LINUX
        long total, user, idle, kernel, nice;
        long cpu_states[4][2];
        FILE *f;
#endif

#ifdef LINUX
        if ((f=fopen("/proc/stat", "r" ))==NULL) {       
                errf("Failed to open /proc/stat (%m)");
                return NULL;
        }

        /* cpu stats should be the first line.. */
        if((fscanf(f,"%*s %ld %ld %ld %ld", &cpu_states[0][0], &cpu_states[1][0], &cpu_states[2][0] ,&cpu_states[3][0])) != 4){
                errf("Failed to read in correct number of CPU stats (%m)");
                return NULL;
        }

        if ((fclose(f)) != 0) {
                errf("Failed to close file (%m)");
                return NULL;
        }

        sleep(WAIT_TIME_IN_SECS);

        if ((f=fopen("/proc/stat", "r" ))==NULL) {       
                errf("Failed to open /proc/stat (%m)");
                return NULL;
        }
        if((fscanf(f,"%*s %ld %ld %ld %ld", &cpu_states[0][1], &cpu_states[1][1], &cpu_states[2][1] ,&cpu_states[3][1])) != 4){
                errf("Failed to read in correct number of CPU stats (%m)");
                return NULL;
        }

        if ((fclose(f)) != 0) {
                errf("Failed to close file (%m)");
                return NULL;
        }

        user=cpu_states[0][1]-cpu_states[0][0]+cpu_states[1][1]-cpu_states[1][0];
        kernel=cpu_states[2][1]-cpu_states[2][0];
        idle=cpu_states[3][1]-cpu_states[3][0];
        total=user+kernel+idle;

        u_p=((double)user/(double)total)*100.00;
        k_p=((double)kernel/(double)total)*100.00;
        i_p=((double)idle/(double)total)*100.00;

#endif
        
        return "jibble";
}

int main(){
        get_cpu_stats();
        exit(0);        
}
Revision:	1.1
Committed:	Mon May 13 17:10:09 2002 UTC (22 years, 4 months ago) by pajs
Content type:	text/plain
Branch:	MAIN
Log Message:	CPU stat's, currently only works on linux and doesn't print it out usefully.
#	User	Rev	Content
1	pajs	1.1	#include <stdio.h>
2			#include <local/ukcprog.h>
3			#include <unistd.h>
4
5			#define WAIT_TIME_IN_SECS 1
6			char *get_cpu_stats(){
7			double u_p, i_p, k_p;
8			#ifdef LINUX
9			long total, user, idle, kernel, nice;
10			long cpu_states[4][2];
11			FILE *f;
12			#endif
13
14			#ifdef LINUX
15			if ((f=fopen("/proc/stat", "r" ))==NULL) {
16			errf("Failed to open /proc/stat (%m)");
17			return NULL;
18			}
19
20			/* cpu stats should be the first line.. */
21			if((fscanf(f,"%*s %ld %ld %ld %ld", &cpu_states[0][0], &cpu_states[1][0], &cpu_states[2][0] ,&cpu_states[3][0])) != 4){
22			errf("Failed to read in correct number of CPU stats (%m)");
23			return NULL;
24			}
25
26			if ((fclose(f)) != 0) {
27			errf("Failed to close file (%m)");
28			return NULL;
29			}
30
31			sleep(WAIT_TIME_IN_SECS);
32
33			if ((f=fopen("/proc/stat", "r" ))==NULL) {
34			errf("Failed to open /proc/stat (%m)");
35			return NULL;
36			}
37			if((fscanf(f,"%*s %ld %ld %ld %ld", &cpu_states[0][1], &cpu_states[1][1], &cpu_states[2][1] ,&cpu_states[3][1])) != 4){
38			errf("Failed to read in correct number of CPU stats (%m)");
39			return NULL;
40			}
41
42			if ((fclose(f)) != 0) {
43			errf("Failed to close file (%m)");
44			return NULL;
45			}
46
47			user=cpu_states[0][1]-cpu_states[0][0]+cpu_states[1][1]-cpu_states[1][0];
48			kernel=cpu_states[2][1]-cpu_states[2][0];
49			idle=cpu_states[3][1]-cpu_states[3][0];
50			total=user+kernel+idle;
51
52			u_p=((double)user/(double)total)*100.00;
53			k_p=((double)kernel/(double)total)*100.00;
54			i_p=((double)idle/(double)total)*100.00;
55
56			#endif
57
58			return "jibble";
59			}
60
61			int main(){
62			get_cpu_stats();
63			exit(0);
64			}