1 files changed, 42 insertions, 0 deletions
diff --git a/open_inodes.c b/open_inodes.c
new file mode 100644
index 0000000..bc20cc6
--- /dev/null
+++ b/open_inodes.c
@@ -0,0 +1,42 @@
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include "common.h"
+
+int open_inodes(int argc, char **argv) {
+	FILE *f;
+	int nr, freen;
+	if(argc > 1) {
+		if(!strcmp(argv[1], "config")) {
+			puts("graph_title Inode table usage\n"
+				"graph_args --base 1000 -l 0\n"
+				"graph_vlabel number of open inodes\n"
+				"graph_category system\n"
+				"graph_info This graph monitors the Linux open inode table.\n"
+				"used.label open inodes\n"
+				"used.info The number of currently open inodes.\n"
+				"max.label inode table size\n"
+				"max.info The size of the system inode table. This is dynamically adjusted by the kernel.");
+
+			return 0;
+		}
+		if(!strcmp(argv[1], "autoconf")) {
+			if(0 == access("/proc/sys/fs/inode-nr", R_OK))
+				return writeyes();
+			else
+				return writeno("/proc/sys/fs/inode-nr not readable");
+		}
+	}
+	if(!(f=fopen("/proc/sys/fs/inode-nr", "r"))) {
+		fputs("cannot open /proc/sys/fs/inode-nr\n", stderr);
+		return 1;
+	}
+	if(2 != fscanf(f, "%d %d", &nr, &freen)) {
+		fclose(f);
+		fputs("cannot read from /proc/sys/fs/inode-nr\n", stderr);
+		return 1;
+	}
+	fclose(f);
+	printf("used.value %d\nmax.value %d\n", nr-freen, nr);
+	return 0;
+}