Munin contributed plugins

#include <string.h>

#include <stdio.h>

#include <unistd.h>

#include "common.h"

int swap(int argc, char **argv) {

        FILE *f;

        char buff[256];

        int in, out;

        if(argc > 1) {

                if(!strcmp(argv[1], "config")) {

                        puts("graph_title Swap in/out\n"

                                "graph_args -l 0 --base 1000\n"

                                "graph_vlabel pages per ${graph_period} in (-) / out (+)\n"

                                "graph_category system\n"

                                "swap_in.label swap\n"

                                "swap_in.type DERIVE\n"

                                "swap_in.max 100000\n"

                                "swap_in.min 0\n"

                                "swap_in.graph no\n"

                                "swap_out.label swap\n"

                                "swap_out.type DERIVE\n"

                                "swap_out.max 100000\n"

                                "swap_out.min 0\n"

                                "swap_out.negative swap_in");

                        print_warncrit("swap_in");

                        print_warncrit("swap_out");

                        return 0;

                }

                if(!strcmp(argv[1], "autoconf")) {

                        if(0 == access(PROC_STAT, R_OK))

                                return writeyes();

                        else

                                return writeno(PROC_STAT " not readable");

                }

        }

        if(!access("/proc/vmstat", F_OK)) {

                in=out=0;

                if(!(f=fopen("/proc/vmstat", "r"))) {

                        fputs("cannot open /proc/vmstat\n", stderr);

                        return 1;

                }

                while(fgets(buff, 256, f)) {

                        if(!in && !strncmp(buff, "pswpin ", 7)) {

                                ++in;

                                printf("swap_in.value %s", buff+7);

                        }

                        else if(!out && !strncmp(buff, "pswpout ", 8)) {

                                ++out;

                                printf("swap_out.value %s", buff+8);

                        }

                }

                fclose(f);

                if(!(in*out)) {

                        fputs("no usable data on /proc/vmstat\n", stderr);

                        return 1;

                }

                return 0;

        } else {

                if(!(f=fopen(PROC_STAT, "r"))) {

                        fputs("cannot open " PROC_STAT "\n", stderr);

                        return 1;

                }

                while(fgets(buff, 256, f)) {

                        if(!strncmp(buff, "swap ", 5)) {

                                fclose(f);

                                if(2 != sscanf(buff+5, "%d %d", &in, &out)) {

                                        fputs("bad data on " PROC_STAT "\n",

                                                        stderr);

                                        return 1;

                                }

                                printf("swap_in.value %d\nswap_out.value %d\n", in, out);

                                return 0;

                        }

                }

                fclose(f);

                fputs("no swap line found in " PROC_STAT "\n", stderr);

                return 1;

        }

}