suckless/slstatus

components/swap.c in master
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swap.c (5044B) download


  1/* See LICENSE file for copyright and license details. */
  2#include <stdint.h>
  3#include <stdio.h>
  4#include <stdlib.h>
  5#include <string.h>
  6
  7#include "../slstatus.h"
  8#include "../util.h"
  9
 10#if defined(__linux__)
 11	static int
 12	get_swap_info(long *s_total, long *s_free, long *s_cached)
 13	{
 14		FILE *fp;
 15		struct {
 16			const char *name;
 17			const size_t len;
 18			long *var;
 19		} ent[] = {
 20			{ "SwapTotal",  sizeof("SwapTotal") - 1,  s_total  },
 21			{ "SwapFree",   sizeof("SwapFree") - 1,   s_free   },
 22			{ "SwapCached", sizeof("SwapCached") - 1, s_cached },
 23		};
 24		size_t line_len = 0, i, left;
 25		char *line = NULL;
 26
 27		/* get number of fields we want to extract */
 28		for (i = 0, left = 0; i < LEN(ent); i++)
 29			if (ent[i].var)
 30				left++;
 31
 32		if (!(fp = fopen("/proc/meminfo", "r"))) {
 33			warn("fopen '/proc/meminfo':");
 34			return 1;
 35		}
 36
 37		/* read file line by line and extract field information */
 38		while (left > 0 && getline(&line, &line_len, fp) >= 0) {
 39			for (i = 0; i < LEN(ent); i++) {
 40				if (ent[i].var &&
 41				    !strncmp(line, ent[i].name, ent[i].len)) {
 42					sscanf(line + ent[i].len + 1,
 43					       "%ld kB\n", ent[i].var);
 44					left--;
 45					break;
 46				}
 47			}
 48		}
 49		free(line);
 50		if (ferror(fp)) {
 51			warn("getline '/proc/meminfo':");
 52			return 1;
 53		}
 54
 55		fclose(fp);
 56		return 0;
 57	}
 58
 59	const char *
 60	swap_free(const char *unused)
 61	{
 62		long free;
 63
 64		if (get_swap_info(NULL, &free, NULL))
 65			return NULL;
 66
 67		return fmt_human(free * 1024, 1024);
 68	}
 69
 70	const char *
 71	swap_perc(const char *unused)
 72	{
 73		long total, free, cached;
 74
 75		if (get_swap_info(&total, &free, &cached) || total == 0)
 76			return NULL;
 77
 78		return bprintf("%d", 100 * (total - free - cached) / total);
 79	}
 80
 81	const char *
 82	swap_total(const char *unused)
 83	{
 84		long total;
 85
 86		if (get_swap_info(&total, NULL, NULL))
 87			return NULL;
 88
 89		return fmt_human(total * 1024, 1024);
 90	}
 91
 92	const char *
 93	swap_used(const char *unused)
 94	{
 95		long total, free, cached;
 96
 97		if (get_swap_info(&total, &free, &cached))
 98			return NULL;
 99
100		return fmt_human((total - free - cached) * 1024, 1024);
101	}
102#elif defined(__OpenBSD__)
103	#include <stdlib.h>
104	#include <sys/swap.h>
105	#include <sys/types.h>
106	#include <unistd.h>
107
108	static int
109	getstats(int *total, int *used)
110	{
111		struct swapent *sep, *fsep;
112		int rnswap, nswap, i;
113
114		if ((nswap = swapctl(SWAP_NSWAP, 0, 0)) < 1) {
115			warn("swaptctl 'SWAP_NSWAP':");
116			return 1;
117		}
118		if (!(fsep = sep = calloc(nswap, sizeof(*sep)))) {
119			warn("calloc 'nswap':");
120			return 1;
121		}
122		if ((rnswap = swapctl(SWAP_STATS, (void *)sep, nswap)) < 0) {
123			warn("swapctl 'SWAP_STATA':");
124			return 1;
125		}
126		if (nswap != rnswap) {
127			warn("getstats: SWAP_STATS != SWAP_NSWAP");
128			return 1;
129		}
130
131		*total = 0;
132		*used = 0;
133
134		for (i = 0; i < rnswap; i++) {
135			*total += sep->se_nblks >> 1;
136			*used += sep->se_inuse >> 1;
137		}
138
139		free(fsep);
140
141		return 0;
142	}
143
144	const char *
145	swap_free(const char *unused)
146	{
147		int total, used;
148
149		if (getstats(&total, &used))
150			return NULL;
151
152		return fmt_human((total - used) * 1024, 1024);
153	}
154
155	const char *
156	swap_perc(const char *unused)
157	{
158		int total, used;
159
160		if (getstats(&total, &used))
161			return NULL;
162
163		if (total == 0)
164			return NULL;
165
166		return bprintf("%d", 100 * used / total);
167	}
168
169	const char *
170	swap_total(const char *unused)
171	{
172		int total, used;
173
174		if (getstats(&total, &used))
175			return NULL;
176
177		return fmt_human(total * 1024, 1024);
178	}
179
180	const char *
181	swap_used(const char *unused)
182	{
183		int total, used;
184
185		if (getstats(&total, &used))
186			return NULL;
187
188		return fmt_human(used * 1024, 1024);
189	}
190#elif defined(__FreeBSD__)
191	#include <fcntl.h>
192	#include <kvm.h>
193	#include <stdlib.h>
194	#include <sys/types.h>
195	#include <unistd.h>
196
197	static int getswapinfo(struct kvm_swap *swap_info, size_t size)
198	{
199		kvm_t *kd;
200
201		kd = kvm_openfiles(NULL, "/dev/null", NULL, 0, NULL);
202		if (kd == NULL) {
203			warn("kvm_openfiles '/dev/null':");
204			return 0;
205		}
206
207		if (kvm_getswapinfo(kd, swap_info, size, 0 /* Unused flags */) < 0) {
208			warn("kvm_getswapinfo:");
209			kvm_close(kd);
210			return 0;
211		}
212
213		kvm_close(kd);
214		return 1;
215	}
216
217	const char *
218	swap_free(const char *unused)
219	{
220		struct kvm_swap swap_info[1];
221		long used, total;
222
223		if (!getswapinfo(swap_info, 1))
224			return NULL;
225
226		total = swap_info[0].ksw_total;
227		used = swap_info[0].ksw_used;
228
229		return fmt_human((total - used) * getpagesize(), 1024);
230	}
231
232	const char *
233	swap_perc(const char *unused)
234	{
235		struct kvm_swap swap_info[1];
236		long used, total;
237
238		if (!getswapinfo(swap_info, 1))
239			return NULL;
240
241		total = swap_info[0].ksw_total;
242		used = swap_info[0].ksw_used;
243
244		return bprintf("%d", used * 100 / total);
245	}
246
247	const char *
248	swap_total(const char *unused)
249	{
250		struct kvm_swap swap_info[1];
251		long total;
252
253		if (!getswapinfo(swap_info, 1))
254			return NULL;
255
256		total = swap_info[0].ksw_total;
257
258		return fmt_human(total * getpagesize(), 1024);
259	}
260
261	const char *
262	swap_used(const char *unused)
263	{
264		struct kvm_swap swap_info[1];
265		long used;
266
267		if (!getswapinfo(swap_info, 1))
268			return NULL;
269
270		used = swap_info[0].ksw_used;
271
272		return fmt_human(used * getpagesize(), 1024);
273	}
274#endif