Munin contributed plugins

#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;

}