swap_*: Port to OpenBSD

diff --git a/README b/README
index c0977aa204286da1eca12f45badf015d6c9bb00e..096103036c295f874e58439100ea5fdd3716aef3 100644 (file)
--- a/README
+++ b/README
@@ -64,4 +64,3 @@ The following functions are not portable at the moment:
 - wifi_{perc,essid}
 - cpu_{perc,iowait}
 - entropy
-- swap_{free,perc,total,used}

diff --git a/components/swap.c b/components/swap.c
index fe779dbaafb75ee8c284a9b307d3d4d64193eae2..f6f8993402f8593e61124da183c63e406b15cef7 100644 (file)
--- a/components/swap.c
+++ b/components/swap.c
@@ -1,11 +1,11 @@
 /* See LICENSE file for copyright and license details. */
-#if defined(__linux__)
-       #include <errno.h>
-       #include <stdio.h>
-       #include <string.h>
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
 
-       #include "../util.h"
+#include "../util.h"
 
+#if defined(__linux__)
        static size_t
        pread(const char *path, char *buf, size_t bufsiz)
        {
@@ -118,5 +118,83 @@
                return bprintf("%f", (float)(total - free - cached) / 1024 / 1024);
        }
 #elif defined(__OpenBSD__)
-       /* unimplemented */
+       #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