1 files changed, 274 insertions, 0 deletions
diff --git a/components/swap.c b/components/swap.c
new file mode 100755
index 0000000..f270d93
--- /dev/null
+++ b/components/swap.c
@@ -0,0 +1,274 @@
+/* See LICENSE file for copyright and license details. */
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "../slstatus.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(const char *unused)
+	{
+		long free;
+
+		if (get_swap_info(NULL, &free, NULL))
+			return NULL;
+
+		return fmt_human(free * 1024, 1024);
+	}
+
+	const char *
+	swap_perc(const char *unused)
+	{
+		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(const char *unused)
+	{
+		long total;
+
+		if (get_swap_info(&total, NULL, NULL))
+			return NULL;
+
+		return fmt_human(total * 1024, 1024);
+	}
+
+	const char *
+	swap_used(const char *unused)
+	{
+		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(const char *unused)
+	{
+		int total, used;
+
+		if (getstats(&total, &used))
+			return NULL;
+
+		return fmt_human((total - used) * 1024, 1024);
+	}
+
+	const char *
+	swap_perc(const char *unused)
+	{
+		int total, used;
+
+		if (getstats(&total, &used))
+			return NULL;
+
+		if (total == 0)
+			return NULL;
+
+		return bprintf("%d", 100 * used / total);
+	}
+
+	const char *
+	swap_total(const char *unused)
+	{
+		int total, used;
+
+		if (getstats(&total, &used))
+			return NULL;
+
+		return fmt_human(total * 1024, 1024);
+	}
+
+	const char *
+	swap_used(const char *unused)
+	{
+		int total, used;
+
+		if (getstats(&total, &used))
+			return NULL;
+
+		return fmt_human(used * 1024, 1024);
+	}
+#elif defined(__FreeBSD__)
+	#include <fcntl.h>
+	#include <kvm.h>
+	#include <stdlib.h>
+	#include <sys/types.h>
+	#include <unistd.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 */) < 0) {
+			warn("kvm_getswapinfo:");
+			kvm_close(kd);
+			return 0;
+		}
+
+		kvm_close(kd);
+		return 1;
+	}
+
+	const char *
+	swap_free(const char *unused)
+	{
+		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(const char *unused)
+	{
+		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(const char *unused)
+	{
+		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(const char *unused)
+	{
+		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