components/swap.c
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/* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include "../util.h"
#if defined(__linux__)
static size_t
pread(const char *path, char *buf, size_t bufsiz)
{
FILE *fp;
size_t bytes_read;
if (!(fp = fopen(path, "r"))) {
fprintf(stderr, "fopen '%s': %s\n", path, strerror(errno));
return 0;
}
if (!(bytes_read = fread(buf, sizeof(char), bufsiz, fp))) {
fprintf(stderr, "fread '%s': %s\n", path, strerror(errno));
fclose(fp);
return 0;
}
fclose(fp);
buf[bytes_read] = '\0';
return bytes_read;
}
const char *
swap_free(void)
{
long total, free;
char *match;
if (!pread("/proc/meminfo", buf, sizeof(buf) - 1)) {
return NULL;
}
if (!(match = strstr(buf, "SwapTotal"))) {
return NULL;
}
sscanf(match, "SwapTotal: %ld kB\n", &total);
if (!(match = strstr(buf, "SwapFree"))) {
return NULL;
}
sscanf(match, "SwapFree: %ld kB\n", &free);
return bprintf("%f", (float)free / 1024 / 1024);
}
const char *
swap_perc(void)
{
long total, free, cached;
char *match;
if (!pread("/proc/meminfo", buf, sizeof(buf) - 1)) {
return NULL;
}
if (!(match = strstr(buf, "SwapTotal"))) {
return NULL;
}
sscanf(match, "SwapTotal: %ld kB\n", &total);
if (!(match = strstr(buf, "SwapCached"))) {
return NULL;
}
sscanf(match, "SwapCached: %ld kB\n", &cached);
if (!(match = strstr(buf, "SwapFree"))) {
return NULL;
}
sscanf(match, "SwapFree: %ld kB\n", &free);
return bprintf("%d", 100 * (total - free - cached) / total);
}
const char *
swap_total(void)
{
long total;
char *match;
if (!pread("/proc/meminfo", buf, sizeof(buf) - 1)) {
return NULL;
}
if (!(match = strstr(buf, "SwapTotal"))) {
return NULL;
}
sscanf(match, "SwapTotal: %ld kB\n", &total);
return bprintf("%f", (float)total / 1024 / 1024);
}
const char *
swap_used(void)
{
long total, free, cached;
char *match;
if (!pread("/proc/meminfo", buf, sizeof(buf) - 1)) {
return NULL;
}
if (!(match = strstr(buf, "SwapTotal"))) {
return NULL;
}
sscanf(match, "SwapTotal: %ld kB\n", &total);
if (!(match = strstr(buf, "SwapCached"))) {
return NULL;
}
sscanf(match, "SwapCached: %ld kB\n", &cached);
if (!(match = strstr(buf, "SwapFree"))) {
return NULL;
}
sscanf(match, "SwapFree: %ld kB\n", &free);
return bprintf("%f", (float)(total - free - cached) / 1024 / 1024);
}
#elif defined(__OpenBSD__)
#include <stdlib.h>
#include <sys/param.h> /* dbtob */
#include <sys/swap.h>
#include <sys/types.h>
#include <unistd.h>
static void
getstats(int *total, int *used)
{
struct swapent *sep, *fsep;
int rnswap, nswap, i;
nswap = swapctl(SWAP_NSWAP, 0, 0);
if (nswap < 1) {
fprintf(stderr, "swaptctl 'SWAP_NSWAP': %s\n", strerror(errno));
}
fsep = sep = calloc(nswap, sizeof(*sep));
if (!sep) {
fprintf(stderr, "calloc 'nswap': %s\n", strerror(errno));
}
rnswap = swapctl(SWAP_STATS, (void *)sep, nswap);
if (rnswap < 0) {
fprintf(stderr, "swapctl 'SWAP_STATA': %s\n", strerror(errno));
}
if (nswap != rnswap) {
fprintf(stderr, "SWAP_STATS != SWAP_NSWAP\n");
}
*total = 0;
*used = 0;
for (i = 0; i < rnswap; i++) {
*total += sep->se_nblks >> 1;
*used += sep->se_inuse >> 1;
}
free(fsep);
}
const char *
swap_free(void)
{
int total, used;
getstats(&total, &used);
return bprintf("%f", (float)(total - used) / 1024 / 1024);
}
const char *
swap_perc(void)
{
int total, used;
getstats(&total, &used);
return bprintf("%d", 100 * used / total);
}
const char *
swap_total(void)
{
int total, used;
getstats(&total, &used);
return bprintf("%f", (float)total / 1024 / 1024);
}
const char *
swap_used(void)
{
int total, used;
getstats(&total, &used);
return bprintf("%f", (float)used / 1024 / 1024);
}
#endif