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#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include "common.h"
int interrupts(int argc, char **argv) {
FILE *f;
char buff[256];
if(argc > 1) {
if(!strcmp(argv[1], "config")) {
puts("graph_title Interrupts & context switches\n"
"graph_args --base 1000 -l 0\n"
"graph_vlabel interrupts & ctx switches / ${graph_period}\n"
"graph_category system\n"
"graph_info This graph shows the number of interrupts and context switches on the system. These are typically high on a busy system.\n"
"intr.info Interrupts are events that alter sequence of instructions executed by a processor. They can come from either hardware (exceptions, NMI, IRQ) or software.");
puts("ctx.info A context switch occurs when a multitasking operatings system suspends the currently running process, and starts executing another.\n"
"intr.label interrupts\n"
"ctx.label context switches\n"
"intr.type DERIVE\n"
"ctx.type DERIVE\n"
"intr.max 100000\n"
"ctx.max 100000\n"
"intr.min 0\n"
"ctx.min 0");
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, "intr ", 5))
printf("intr.value %s", buff+5);
else if(!strncmp(buff, "ctxt ", 5))
printf("ctx.value %s", buff+5);
}
fclose(f);
return 0;
}
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