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-rw-r--r--swap.c78
1 files changed, 78 insertions, 0 deletions
diff --git a/swap.c b/swap.c
new file mode 100644
index 0000000..fef6cc3
--- /dev/null
+++ b/swap.c
@@ -0,0 +1,78 @@
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include "common.h"
+
+int swap(int argc, char **argv) {
+ FILE *f;
+ char buff[256];
+ int in, out;
+ if(argc > 1) {
+ if(!strcmp(argv[1], "config")) {
+ puts("graph_title Swap in/out\n"
+ "graph_args -l 0 --base 1000\n"
+ "graph_vlabel pages per ${graph_period} in (-) / out (+)\n"
+ "graph_category system\n"
+ "swap_in.label swap\n"
+ "swap_in.type DERIVE\n"
+ "swap_in.max 100000\n"
+ "swap_in.min 0\n"
+ "swap_in.graph no\n"
+ "swap_out.label swap\n"
+ "swap_out.type DERIVE\n"
+ "swap_out.max 100000\n"
+ "swap_out.min 0\n"
+ "swap_out.negative swap_in");
+
+ return 0;
+ }
+ if(!strcmp(argv[1], "autoconf")) {
+ if(0 == access("/proc/stat", R_OK))
+ return writeyes();
+ else
+ return writeno("/proc/stat not readable");
+ }
+ }
+ if(!access("/proc/vmstat", F_OK)) {
+ in=out=0;
+ if(!(f=fopen("/proc/vmstat", "r"))) {
+ fputs("cannot open /proc/vmstat\n", stderr);
+ return 1;
+ }
+ while(fgets(buff, 256, f)) {
+ if(!in && !strncmp(buff, "pswpin ", 7)) {
+ ++in;
+ printf("swap_in.value %s", buff+7);
+ }
+ else if(!out && !strncmp(buff, "pswpout ", 8)) {
+ ++out;
+ printf("swap_out.value %s", buff+8);
+ }
+ }
+ fclose(f);
+ if(!in*out) {
+ fputs("no usable data on /proc/vmstat\n", stderr);
+ return 1;
+ }
+ return 0;
+ } else {
+ if(!(f=fopen("/proc/stat", "r"))) {
+ fputs("cannot open /proc/stat\n", stderr);
+ return 1;
+ }
+ while(fgets(buff, 256, f)) {
+ if(!strncmp(buff, "swap ", 5)) {
+ fclose(f);
+ if(2 != sscanf(buff+5, "%d %d", &in, &out)) {
+ fputs("bad data on /proc/stat\n", stderr);
+ return 1;
+ }
+ printf("swap_in.value %d\nswap_out.value %d\n", in, out);
+ return 0;
+ }
+ }
+ fclose(f);
+ fputs("no swap line found in /proc/stat\n", stderr);
+ return 1;
+ }
+}