- /* See LICENSE file for copyright and license details. */
- #include <errno.h>
- #include <stdio.h>
- #include <string.h>
-
- #include "../util.h"
-
- #if defined(__linux__)
- static size_t
- pread(const char *path, char *buf, size_t bufsiz)
- {
- FILE *fp;
- size_t bytes_read;
-
- if (!(fp = fopen(path, "r"))) {
- fprintf(stderr, "fopen '%s': %s\n", path,
- strerror(errno));
- return 0;
- }
- if ((bytes_read = fread(buf, sizeof(char), bufsiz, fp)) == 0) {
- fprintf(stderr, "fread '%s': %s\n", path,
- strerror(errno));
- fclose(fp);
- return 0;
- }
- fclose(fp);
-
- buf[bytes_read] = '\0';
-
- return bytes_read;
- }
-
- const char *
- swap_free(void)
- {
- long total, free;
- char *match;
-
- if (!pread("/proc/meminfo", buf, sizeof(buf) - 1)) {
- return NULL;
- }
-
- 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;
- char *match;
-
- if (!pread("/proc/meminfo", buf, sizeof(buf) - 1)) {
- return NULL;
- }
-
- 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;
- char *match;
-
- if (!pread("/proc/meminfo", buf, sizeof(buf) - 1)) {
- return NULL;
- }
-
- 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;
- char *match;
-
- if (!pread("/proc/meminfo", buf, sizeof(buf) - 1)) {
- return NULL;
- }
-
- 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("%f", (float)(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>
-
- #define dbtoqb(b) dbtob((int64_t)(b))
-
- static void
- getstats(int *total, int *used)
- {
- struct swapent *sep, *fsep;
- int rnswap, nswap, i;
-
- nswap = swapctl(SWAP_NSWAP, 0, 0);
- if (nswap < 1)
- fprintf(stderr, "swaptctl 'SWAP_NSWAP': %s\n", strerror(errno));
-
- fsep = sep = calloc(nswap, sizeof(*sep));
- if (sep == NULL)
- fprintf(stderr, "calloc 'nswap': %s\n", strerror(errno));
-
- rnswap = swapctl(SWAP_STATS, (void *)sep, nswap);
- if (rnswap < 0)
- fprintf(stderr, "swapctl 'SWAP_STATA': %s\n", strerror(errno));
-
- if (nswap != rnswap)
- fprintf(stderr, "SWAP_STATS != SWAP_NSWAP\n");
-
- *total = 0;
- *used = 0;
-
- for (i = 0; i < rnswap; i++) {
- *total += dbtoqb(sep->se_nblks);
- *used += dbtoqb(sep->se_inuse);
- }
-
- free(fsep);
- }
-
- const char *
- swap_free(void)
- {
- int total, used;
-
- getstats(&total, &used);
-
- return bprintf("%f", (float)(total - used) / 1024 / 1024 / 1024);
- }
-
- const char *
- swap_perc(void)
- {
- int total, used;
-
- getstats(&total, &used);
-
- return bprintf("%d", 100 * used / total);
- }
-
- const char *
- swap_total(void)
- {
- int total, used;
-
- getstats(&total, &used);
-
- return bprintf("%f", (float)total / 1024 / 1024 / 1024);
- }
-
- const char *
- swap_used(void)
- {
- int total, used;
-
- getstats(&total, &used);
-
- return bprintf("%f", (float)used / 1024 / 1024 / 1024);
- }
- #endif
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