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");

                        print_warncrit("intr");

                        print_warncrit("ctx");

                        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)) {

                        buff[5 + strcspn(buff + 5, " \t\n")] = '\0';

                        printf("intr.value %s\n", buff+5);

                } else if(!strncmp(buff, "ctxt ", 5)) {

                        buff[5 + strcspn(buff + 5, " \t\n")] = '\0';

                        printf("ctx.value %s\n", buff+5);

                }

        }

        fclose(f);

        return 0;

}