slstatus/components/swap.c

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/* See LICENSE file for copyright and license details. */
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#include <errno.h>
#include <stdio.h>
#include <string.h>
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#include "../util.h"
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#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"))) {
warn("fopen '%s':", path);
return 0;
}
if (!(bytes_read = fread(buf, sizeof(char), bufsiz, fp))) {
warn("fread '%s':", path);
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 fmt_human(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);
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if (total == 0) {
return NULL;
}
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 fmt_human(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 fmt_human((total - free - cached) * 1024, 1024);
}
#elif defined(__OpenBSD__)
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#include <stdlib.h>
#include <sys/param.h> /* dbtob */
#include <sys/swap.h>
#include <sys/types.h>
#include <unistd.h>
static int
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getstats(int *total, int *used)
{
struct swapent *sep, *fsep;
int rnswap, nswap, i;
if ((nswap = swapctl(SWAP_NSWAP, 0, 0)) < 1) {
warn("swaptctl 'SWAP_NSWAP':");
return 1;
}
if (!(fsep = sep = calloc(nswap, sizeof(*sep)))) {
warn("calloc 'nswap':");
return 1;
}
if ((rnswap = swapctl(SWAP_STATS, (void *)sep, nswap)) < 0) {
warn("swapctl 'SWAP_STATA':");
return 1;
}
if (nswap != rnswap) {
warn("getstats: SWAP_STATS != SWAP_NSWAP");
return 1;
}
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*total = 0;
*used = 0;
for (i = 0; i < rnswap; i++) {
*total += sep->se_nblks >> 1;
*used += sep->se_inuse >> 1;
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}
free(fsep);
return 0;
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}
const char *
swap_free(void)
{
int total, used;
if (getstats(&total, &used)) {
return NULL;
}
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return fmt_human((total - used) * 1024, 1024);
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}
const char *
swap_perc(void)
{
int total, used;
if (getstats(&total, &used)) {
return NULL;
}
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if (total == 0) {
return NULL;
}
return bprintf("%d", 100 * used / total);
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}
const char *
swap_total(void)
{
int total, used;
if (getstats(&total, &used)) {
return NULL;
}
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return fmt_human(total * 1024, 1024);
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}
const char *
swap_used(void)
{
int total, used;
if (getstats(&total, &used)) {
return NULL;
}
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return fmt_human(used * 1024, 1024);
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}
#endif