/* See LICENSE file for copyright and license details. */
-#include <errno.h>
+#include <stdint.h>
#include <stdio.h>
+#include <stdlib.h>
#include <string.h>
#include "../util.h"
#if defined(__linux__)
- static size_t
- pread(const char *path, char *buf, size_t bufsiz)
+ static int
+ get_swap_info(long *s_total, long *s_free, long *s_cached)
{
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;
+ struct {
+ const char *name;
+ const size_t len;
+ long *var;
+ } ent[] = {
+ { "SwapTotal", sizeof("SwapTotal") - 1, s_total },
+ { "SwapFree", sizeof("SwapFree") - 1, s_free },
+ { "SwapCached", sizeof("SwapCached") - 1, s_cached },
+ };
+ size_t line_len = 0, i, left;
+ char *line = NULL;
+
+ /* get number of fields we want to extract */
+ for (i = 0, left = 0; i < LEN(ent); i++) {
+ if (ent[i].var) {
+ left++;
+ }
+ }
+
+ if (!(fp = fopen("/proc/meminfo", "r"))) {
+ warn("fopen '/proc/meminfo':");
+ return 1;
+ }
+
+ /* read file line by line and extract field information */
+ while (left > 0 && getline(&line, &line_len, fp) >= 0) {
+ for (i = 0; i < LEN(ent); i++) {
+ if (ent[i].var &&
+ !strncmp(line, ent[i].name, ent[i].len)) {
+ sscanf(line + ent[i].len + 1,
+ "%ld kB\n", ent[i].var);
+ left--;
+ break;
+ }
+ }
+ }
+ free(line);
+ if (ferror(fp)) {
+ warn("getline '/proc/meminfo':");
+ return 1;
}
- fclose(fp);
- buf[bytes_read] = '\0';
-
- return bytes_read;
+ fclose(fp);
+ return 0;
}
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);
+ long free;
- if (!(match = strstr(buf, "SwapFree"))) {
+ if (get_swap_info(NULL, &free, NULL)) {
return NULL;
}
- sscanf(match, "SwapFree: %ld kB\n", &free);
- return bprintf("%f", (float)free / 1024 / 1024);
+ 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"))) {
+ if (get_swap_info(&total, &free, &cached) || total == 0) {
return NULL;
}
- sscanf(match, "SwapFree: %ld kB\n", &free);
return bprintf("%d", 100 * (total - free - cached) / total);
}
swap_total(void)
{
long total;
- char *match;
-
- if (!pread("/proc/meminfo", buf, sizeof(buf) - 1)) {
- return NULL;
- }
- if (!(match = strstr(buf, "SwapTotal"))) {
+ if (get_swap_info(&total, NULL, NULL)) {
return NULL;
}
- sscanf(match, "SwapTotal: %ld kB\n", &total);
- return bprintf("%f", (float)total / 1024 / 1024);
+ 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)) {
+ if (get_swap_info(&total, &free, &cached)) {
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);
+ return fmt_human((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
+ static int
getstats(int *total, int *used)
{
struct swapent *sep, *fsep;
int rnswap, nswap, i;
- nswap = swapctl(SWAP_NSWAP, 0, 0);
- if (nswap < 1) {
+ if ((nswap = swapctl(SWAP_NSWAP, 0, 0)) < 1) {
warn("swaptctl 'SWAP_NSWAP':");
+ return 1;
}
-
- fsep = sep = calloc(nswap, sizeof(*sep));
- if (!sep) {
+ if (!(fsep = sep = calloc(nswap, sizeof(*sep)))) {
warn("calloc 'nswap':");
+ return 1;
}
-
- rnswap = swapctl(SWAP_STATS, (void *)sep, nswap);
- if (rnswap < 0) {
+ 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;
}
*total = 0;
}
free(fsep);
+
+ return 0;
}
const char *
{
int total, used;
- getstats(&total, &used);
+ if (getstats(&total, &used)) {
+ return NULL;
+ }
- return bprintf("%f", (float)(total - used) / 1024 / 1024);
+ return fmt_human((total - used) * 1024, 1024);
}
const char *
{
int total, used;
- getstats(&total, &used);
+ if (getstats(&total, &used)) {
+ return NULL;
+ }
+
+ if (total == 0) {
+ return NULL;
+ }
return bprintf("%d", 100 * used / total);
}
{
int total, used;
- getstats(&total, &used);
+ if (getstats(&total, &used)) {
+ return NULL;
+ }
- return bprintf("%f", (float)total / 1024 / 1024);
+ return fmt_human(total * 1024, 1024);
}
const char *
{
int total, used;
- getstats(&total, &used);
+ if (getstats(&total, &used)) {
+ return NULL;
+ }
- return bprintf("%f", (float)used / 1024 / 1024);
+ return fmt_human(used * 1024, 1024);
}
#endif