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#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <ctype.h>
#include <stdlib.h>
#include "common.h"
#define SYSWARNING 30
#define SYSCRITICAL 50
#define USRWARNING 80
int cpu(int argc, char **argv) {
FILE *f;
char buff[256], *s;
int ncpu=0, extinfo=0, scaleto100=0;
if(argc > 1) {
if(!strcmp(argv[1], "config")) {
s = getenv("scaleto100");
if(s && !strcmp(s, "yes"))
scaleto100=1;
if(!(f=fopen(PROC_STAT, "r"))) {
fputs("cannot open " PROC_STAT "\n", stderr);
return 1;
}
while(fgets(buff, 256, f)) {
if(!strncmp(buff, "cpu", 3)) {
if(isdigit(buff[3]))
ncpu++;
if(buff[3] == ' ') {
s = strtok(buff+4, " \t");
for(extinfo=0;strtok(NULL, " \t");extinfo++)
;
}
}
}
fclose(f);
if(ncpu < 1 || extinfo < 4) {
fputs("cannot parse " PROC_STAT "\n", stderr);
return 1;
}
puts("graph_title CPU usage");
if(extinfo == 7)
puts("graph_order system user nice idle iowait irq softirq");
else
puts("graph_order system user nice idle");
if(scaleto100)
puts("graph_args --base 1000 -r --lower-limit 0 --upper-limit 100");
else
printf("graph_args --base 1000 -r --lower-limit 0 --upper-limit %d\n", 100 * ncpu);
puts("graph_vlabel %\n"
"graph_scale no\n"
"graph_info This graph shows how CPU time is spent.\n"
"graph_category system\n"
"graph_period second\n"
"system.label system\n"
"system.draw AREA");
printf("system.max %d\n", 100 * ncpu);
puts("system.min 0\n"
"system.type DERIVE");
printf("system.warning %d\n", SYSWARNING * ncpu);
printf("system.critical %d\n", SYSCRITICAL * ncpu);
puts("system.info CPU time spent by the kernel in system activities\n"
"user.label user\n"
"user.draw STACK\n"
"user.min 0");
printf("user.max %d\n", 100 * ncpu);
printf("user.warning %d\n", USRWARNING * ncpu);
puts("user.type DERIVE\n"
"user.info CPU time spent by normal programs and daemons\n"
"nice.label nice\n"
"nice.draw STACK\n"
"nice.min 0");
printf("nice.max %d\n", 100 * ncpu);
puts("nice.type DERIVE\n"
"nice.info CPU time spent by nice(1)d programs\n"
"idle.label idle\n"
"idle.draw STACK\n"
"idle.min 0");
printf("idle.max %d\n", 100 * ncpu);
puts("idle.type DERIVE\n"
"idle.info Idle CPU time");
if(scaleto100)
printf("system.cdef system,%d,/\n"
"user.cdef user,%d,/\n"
"nice.cdef nice,%d,/\n"
"idle.cdef idle,%d,/\n", ncpu, ncpu, ncpu, ncpu);
if(extinfo == 7) {
puts("iowait.label iowait\n"
"iowait.draw STACK\n"
"iowait.min 0");
printf("iowait.max %d\n", 100 * ncpu);
puts("iowait.type DERIVE\n"
"iowait.info CPU time spent waiting for I/O operations to finish\n"
"irq.label irq\n"
"irq.draw STACK\n"
"irq.min 0");
printf("irq.max %d\n", 100 * ncpu);
puts("irq.type DERIVE\n"
"irq.info CPU time spent handling interrupts\n"
"softirq.label softirq\n"
"softirq.draw STACK\n"
"softirq.min 0");
printf("softirq.max %d\n", 100 * ncpu);
puts("softirq.type DERIVE\n"
"softirq.info CPU time spent handling \"batched\" interrupts");
if(scaleto100)
printf("iowait.cdef iowait,%d,/\n"
"irq.cdef irq,%d,/\n"
"softirq.cdef softirq,%d,/\n", ncpu, ncpu, ncpu);
}
return 0;
}
if(!strcmp(argv[1], "autoconf")) {
if(0 == access(PROC_STAT, R_OK))
return writeyes();
else
return writeno(PROC_STAT " not readable");
}
}
if(!(f=fopen(PROC_STAT, "r"))) {
fputs("cannot open " PROC_STAT "\n", stderr);
return 1;
}
while(fgets(buff, 256, f)) {
if(!strncmp(buff, "cpu ", 4)) {
fclose(f);
if(!(s = strtok(buff+4, " \t")))
break;
printf("user.value %s\n", s);
if(!(s = strtok(NULL, " \t")))
break;
printf("nice.value %s\n", s);
if(!(s = strtok(NULL, " \t")))
break;
printf("system.value %s\n", s);
if(!(s = strtok(NULL, " \t")))
break;
printf("idle.value %s\n", s);
if(!(s = strtok(NULL, " \t")))
return 0;
printf("iowait.value %s\n", s);
if(!(s = strtok(NULL, " \t")))
return 0;
printf("irq.value %s\n", s);
if(!(s = strtok(NULL, " \t")))
return 0;
printf("softirq.value %s\n", s);
return 0;
}
}
fclose(f);
fputs("no cpu line found in " PROC_STAT "\n", stderr);
return 1;
}
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