X-Git-Url: https://git.xinqibao.xyz/slstatus.git/blobdiff_plain/96f3a8a54eeb3b2294ed953dad8b15349f3e2703..7fe240856eef7b56d8ca0b57fd5642dbdc5b89b1:/components/swap.c

diff --git a/components/swap.c b/components/swap.c
index b82ff46..9bd599a 100644
--- a/components/swap.c
+++ b/components/swap.c
@@ -1,137 +1,201 @@
 /* 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, "Failed to open file /proc/meminfo");
-		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, "swap_free: read error");
 		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, "Failed to open file /proc/meminfo");
-		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, "swap_perc: read error");
-		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, "Failed to open file /proc/meminfo");
-		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, "swap_total: read error");
-		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, "Failed to open file /proc/meminfo");
-		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, "swap_used: read error");
-		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