Munin contributed plugins

#include <unistd.h>

#include <time.h>

		"graph_vlabel average cpu use %%\n"

	return 0;

}

char* pid_filename = "./multicpu1sec.pid";

char* cache_filename = "./multicpu1sec.value";

/* Wait until the next second, and return the EPOCH */

time_t wait_until_next_second() {

	struct timespec tp;

	clock_gettime(CLOCK_REALTIME, &tp);

	time_t current_epoch = tp.tv_sec;

	long nsec_to_sleep = 1000*1000*1000 - tp.tv_nsec;

	/* Only sleep if needed */

	if (nsec_to_sleep > 0) {

		tp.tv_sec = 0;

		tp.tv_nsec = nsec_to_sleep;

		nanosleep(&tp, NULL);

	}

	return current_epoch + 1;

	/* write the pid */

	FILE* pid_file = fopen(pid_filename, "w");

	fprintf(pid_file, "%d\n", getpid());

	fclose(pid_file);

	/* loop each second */

	while (1) {

		/* wait until next second */

		time_t epoch = wait_until_next_second();

		/* Reading /proc/stat */

		FILE* f = fopen(PROC_STAT, "r");

		// Read and ignore the 1rst line

		char buffer[1024];

		fgets(buffer, 1024, f);

		/* open the spoolfile */

		FILE* cache_file = fopen(cache_filename, "a");

		while (! feof(f)) {

			if (fgets(buffer, 1024, f) == 0) {

				// EOF

				break;

			}

			// Not on CPU lines anymore

			if (strncmp(buffer, "cpu", 3)) break;

			char cpu_id[64];

			long usr, nice, sys, idle, iowait, irq, softirq;

			sscanf(buffer, "%s %ld %ld %ld %ld %ld", cpu_id, &usr, &nice, &sys, &idle, &iowait, &irq, &softirq);

			long used = usr + nice + sys + idle + iowait + irq + softirq;

			fprintf(cache_file, "%s.value %ld:%ld\n", cpu_id, epoch, used);

		}

		fclose(cache_file);

		fclose(f);

	}

	return 0;