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- /* See LICENSE file for copyright and license details. */
- #include <stdint.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
-
- #include "../util.h"
-
- #if defined(__linux__)
- static int
- get_swap_info(long *s_total, long *s_free, long *s_cached)
- {
- FILE *fp;
- 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);
- return 0;
- }
-
- const char *
- swap_free(void)
- {
- long free;
-
- if (get_swap_info(NULL, &free, NULL)) {
- return NULL;
- }
-
- return fmt_human(free * 1024, 1024);
- }
-
- const char *
- swap_perc(void)
- {
- long total, free, cached;
-
- if (get_swap_info(&total, &free, &cached) || total == 0) {
- return NULL;
- }
-
- return bprintf("%d", 100 * (total - free - cached) / total);
- }
-
- const char *
- swap_total(void)
- {
- long total;
-
- if (get_swap_info(&total, NULL, NULL)) {
- return NULL;
- }
-
- return fmt_human(total * 1024, 1024);
- }
-
- const char *
- swap_used(void)
- {
- long total, free, cached;
-
- if (get_swap_info(&total, &free, &cached)) {
- return NULL;
- }
-
- return fmt_human((total - free - cached) * 1024, 1024);
- }
- #elif defined(__OpenBSD__)
- #include <stdlib.h>
- #include <sys/swap.h>
- #include <sys/types.h>
- #include <unistd.h>
-
- static int
- 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;
- }
-
- *total = 0;
- *used = 0;
-
- for (i = 0; i < rnswap; i++) {
- *total += sep->se_nblks >> 1;
- *used += sep->se_inuse >> 1;
- }
-
- free(fsep);
-
- return 0;
- }
-
- const char *
- swap_free(void)
- {
- int total, used;
-
- if (getstats(&total, &used)) {
- return NULL;
- }
-
- return fmt_human((total - used) * 1024, 1024);
- }
-
- const char *
- swap_perc(void)
- {
- int total, used;
-
- if (getstats(&total, &used)) {
- return NULL;
- }
-
- if (total == 0) {
- return NULL;
- }
-
- return bprintf("%d", 100 * used / total);
- }
-
- const char *
- swap_total(void)
- {
- int total, used;
-
- if (getstats(&total, &used)) {
- return NULL;
- }
-
- return fmt_human(total * 1024, 1024);
- }
-
- const char *
- swap_used(void)
- {
- int total, used;
-
- if (getstats(&total, &used)) {
- return NULL;
- }
-
- return fmt_human(used * 1024, 1024);
- }
- #endif
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