components/swap.c
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/* See LICENSE file for copyright and license details. */
#if defined(__linux__)
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include "../util.h"
const char *
swap_free(void)
{
long total, free;
FILE *fp;
size_t bytes_read;
char *match;
fp = fopen("/proc/meminfo", "r");
if (fp == NULL) {
fprintf(stderr, "fopen '/proc/meminfo': %s\n",
strerror(errno));
return NULL;
}
if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1,
fp)) == 0) {
fprintf(stderr, "fread '/proc/meminfo': %s\n",
strerror(errno));
fclose(fp);
return NULL;
}
fclose(fp);
if ((match = strstr(buf, "SwapTotal")) == NULL)
return NULL;
sscanf(match, "SwapTotal: %ld kB\n", &total);
if ((match = strstr(buf, "SwapFree")) == NULL)
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;
FILE *fp;
size_t bytes_read;
char *match;
fp = fopen("/proc/meminfo", "r");
if (fp == NULL) {
fprintf(stderr, "fopen '/proc/meminfo': %s\n",
strerror(errno));
return NULL;
}
if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1,
fp)) == 0) {
fprintf(stderr, "fread '/proc/meminfo': %s\n",
strerror(errno));
fclose(fp);
return NULL;
}
fclose(fp);
if ((match = strstr(buf, "SwapTotal")) == NULL)
return NULL;
sscanf(match, "SwapTotal: %ld kB\n", &total);
if ((match = strstr(buf, "SwapCached")) == NULL)
return NULL;
sscanf(match, "SwapCached: %ld kB\n", &cached);
if ((match = strstr(buf, "SwapFree")) == NULL)
return NULL;
sscanf(match, "SwapFree: %ld kB\n", &free);
return bprintf("%d", 100 * (total - free - cached) / total);
}
const char *
swap_total(void)
{
long total;
FILE *fp;
size_t bytes_read;
char *match;
fp = fopen("/proc/meminfo", "r");
if (fp == NULL) {
fprintf(stderr, "fopen '/proc/meminfo': %s\n",
strerror(errno));
return NULL;
}
if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1,
fp)) == 0) {
fprintf(stderr, "fread '/proc/meminfo': %s\n",
strerror(errno));
fclose(fp);
return NULL;
}
fclose(fp);
if ((match = strstr(buf, "SwapTotal")) == NULL)
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;
FILE *fp;
size_t bytes_read;
char *match;
fp = fopen("/proc/meminfo", "r");
if (fp == NULL) {
fprintf(stderr, "fopen '/proc/meminfo': %s\n",
strerror(errno));
return NULL;
}
if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1,
fp)) == 0) {
fprintf(stderr, "fread '/proc/meminfo': %s\n",
strerror(errno));
fclose(fp);
return NULL;
}
fclose(fp);
if ((match = strstr(buf, "SwapTotal")) == NULL)
return NULL;
sscanf(match, "SwapTotal: %ld kB\n", &total);
if ((match = strstr(buf, "SwapCached")) == NULL)
return NULL;
sscanf(match, "SwapCached: %ld kB\n", &cached);
if ((match = strstr(buf, "SwapFree")) == NULL)
return NULL;
sscanf(match, "SwapFree: %ld kB\n", &free);
return bprintf("%f", (float)(total - free - cached) / 1024 / 1024);
}
#elif defined(__OpenBSD__)
/* unimplemented */
#endif