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"
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)) == 0) {
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")) == 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;
char *match;
if (!pread("/proc/meminfo", buf, sizeof(buf) - 1)) {
return NULL;
}
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;
char *match;
if (!pread("/proc/meminfo", buf, sizeof(buf) - 1)) {
return NULL;
}
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;
char *match;
if (!pread("/proc/meminfo", buf, sizeof(buf) - 1)) {
return NULL;
}
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