slstatus

swap.c (4914B)

---

 /* 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);
 	}
 #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