slstatus/components/swap.c
Aaron Marcher e79d4932ea More robust preprocessor switches
Replace #ifdef with #if defined() and #elif with #elif defined() as it
should only test if it is defined or not.
2018-03-21 12:21:37 +01:00

138 lines
2.8 KiB
C

/* See LICENSE file for copyright and license details. */
#if defined(__linux__)
#include <err.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) {
warn("Failed to open file /proc/meminfo");
return NULL;
}
if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
warn("swap_free: read error");
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) {
warn("Failed to open file /proc/meminfo");
return NULL;
}
if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
warn("swap_perc: read error");
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) {
warn("Failed to open file /proc/meminfo");
return NULL;
}
if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
warn("swap_total: read error");
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) {
warn("Failed to open file /proc/meminfo");
return NULL;
}
if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
warn("swap_used: read error");
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);
}
#endif