X-Git-Url: https://git.xinqibao.xyz/slstatus.git/blobdiff_plain/42edfea89a47cbf0623d1aaf5673a4e5ca79fb52..43a12832a343747b7317987b552a87eb8ed5b42d:/components/swap.c
diff --git a/components/swap.c b/components/swap.c
index f3bbeb2..b3b519e 100644
--- a/components/swap.c
+++ b/components/swap.c
@@ -1,138 +1,200 @@
/* See LICENSE file for copyright and license details. */
-#if defined(__linux__)
-#include <errno.h>
+#include <stdint.h>
#include <stdio.h>
+#include <stdlib.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 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;
+ }
- 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;
+ return 0;
}
- 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;
+
+ const char *
+ swap_free(void)
+ {
+ long free;
+
+ if (get_swap_info(NULL, &free, NULL)) {
+ return NULL;
+ }
+
+ return fmt_human(free * 1024, 1024);
}
- 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;
+ 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);
}
- 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;
+
+ const char *
+ swap_total(void)
+ {
+ long total;
+
+ if (get_swap_info(&total, NULL, NULL)) {
+ return NULL;
+ }
+
+ return fmt_human(total * 1024, 1024);
}
- 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;
+
+ 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);
}
- 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;
+#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;
}
- 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;
+
+ 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);
}
- fclose(fp);
- if ((match = strstr(buf, "SwapTotal")) == NULL)
- return NULL;
- sscanf(match, "SwapTotal: %ld kB\n", &total);
+ const char *
+ swap_total(void)
+ {
+ int total, used;
- if ((match = strstr(buf, "SwapCached")) == NULL)
- return NULL;
- sscanf(match, "SwapCached: %ld kB\n", &cached);
+ if (getstats(&total, &used)) {
+ return NULL;
+ }
- if ((match = strstr(buf, "SwapFree")) == NULL)
- return NULL;
- sscanf(match, "SwapFree: %ld kB\n", &free);
+ return fmt_human(total * 1024, 1024);
+ }
- return bprintf("%f", (float)(total - free - cached) / 1024 / 1024);
-}
+ const char *
+ swap_used(void)
+ {
+ int total, used;
+
+ if (getstats(&total, &used)) {
+ return NULL;
+ }
+
+ return fmt_human(used * 1024, 1024);
+ }
#endif