X-Git-Url: https://git.xinqibao.xyz/slstatus.git/blobdiff_plain/7f91ce265ea456b3096ccba7fdbb890bcf00e225..a1ac203d16c379d7fc05765545af2977a7a3584d:/components/swap.c?ds=sidebyside

diff --git a/components/swap.c b/components/swap.c
index 37ee85c..2509db1 100644
--- a/components/swap.c
+++ b/components/swap.c
@@ -1,53 +1,71 @@
 /* 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;
+		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 (!(bytes_read = fread(buf, sizeof(char), bufsiz, fp))) {
-			warn("fread '%s':", path);
-			fclose(fp);
-			return 0;
+
+		if (!(fp = fopen("/proc/meminfo", "r"))) {
+			warn("fopen '/proc/meminfo':");
+			return 1;
 		}
-		fclose(fp);
 
-		buf[bytes_read] = '\0';
+		/* 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;
+		}
 
-		return bytes_read;
+		fclose(fp);
+		return 0;
 	}
 
 	const char *
 	swap_free(void)
 	{
-		long total, free;
-		char *match;
+		long free;
 
-		if (!pread("/proc/meminfo", buf, sizeof(buf) - 1)) {
+		if (get_swap_info(NULL, &free, NULL)) {
 			return NULL;
 		}
 
-		if (!(match = strstr(buf, "SwapTotal"))) {
-			return NULL;
-		}
-		sscanf(match, "SwapTotal: %ld kB\n", &total);
-
-		if (!(match = strstr(buf, "SwapFree"))) {
-			return NULL;
-		}
-		sscanf(match, "SwapFree: %ld kB\n", &free);
-
 		return fmt_human(free * 1024, 1024);
 	}
 
@@ -55,28 +73,8 @@
 	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"))) {
-			return NULL;
-		}
-		sscanf(match, "SwapFree: %ld kB\n", &free);
-
-		if (total == 0) {
+		if (get_swap_info(&total, &free, &cached) || total == 0) {
 			return NULL;
 		}
 
@@ -87,16 +85,10 @@
 	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 fmt_human(total * 1024, 1024);
 	}
@@ -105,32 +97,15 @@
 	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 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>
@@ -222,4 +197,88 @@
 
 		return fmt_human(used * 1024, 1024);
 	}
+#elif defined(__FreeBSD__)
+	#include <stdlib.h>
+	#include <sys/types.h>
+	#include <fcntl.h>
+	#include <unistd.h>
+	#include <kvm.h>
+
+	static int getswapinfo(struct kvm_swap *swap_info, size_t size)
+	{
+		kvm_t *kd;
+
+		kd = kvm_openfiles(NULL, "/dev/null", NULL, 0, NULL);
+		if(kd == NULL) {
+			warn("kvm_openfiles '/dev/null':");
+			return 0;
+		}
+
+		if(kvm_getswapinfo(kd, swap_info, size, 0 /* Unused flags */) == -1) {
+			warn("kvm_getswapinfo:");
+			kvm_close(kd);
+			return 0;
+		}
+
+		kvm_close(kd);
+		return 1;
+	}
+
+	const char *
+	swap_free(void)
+	{
+		struct kvm_swap swap_info[1];
+		long used, total;
+
+		if(!getswapinfo(swap_info, 1))
+			return NULL;
+
+		total = swap_info[0].ksw_total;
+		used = swap_info[0].ksw_used;
+
+		return fmt_human((total - used) * getpagesize(), 1024);
+	}
+
+	const char *
+	swap_perc(void)
+	{
+		struct kvm_swap swap_info[1];
+		long used, total;
+
+		if(!getswapinfo(swap_info, 1))
+			return NULL;
+
+		total = swap_info[0].ksw_total;
+		used = swap_info[0].ksw_used;
+
+		return bprintf("%d", used * 100 / total);
+	}
+
+	const char *
+	swap_total(void)
+	{
+		struct kvm_swap swap_info[1];
+		long total;
+
+		if(!getswapinfo(swap_info, 1))
+			return NULL;
+
+		total = swap_info[0].ksw_total;
+
+		return fmt_human(total * getpagesize(), 1024);
+	}
+
+	const char *
+	swap_used(void)
+	{
+		struct kvm_swap swap_info[1];
+		long used;
+
+		if(!getswapinfo(swap_info, 1))
+			return NULL;
+
+		used = swap_info[0].ksw_used;
+
+		return fmt_human(used * getpagesize(), 1024);
+	}
 #endif