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-rw-r--r--open_files.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/open_files.c b/open_files.c
new file mode 100644
index 0000000..3f82c8b
--- /dev/null
+++ b/open_files.c
@@ -0,0 +1,52 @@
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include "common.h"
+
+int open_files(int argc, char **argv) {
+ FILE *f;
+ int alloc, freeh, avail;
+ if(argc > 1) {
+ if(!strcmp(argv[1], "config")) {
+ if(!(f=fopen("/proc/sys/fs/file-nr", "r"))) {
+ fprintf(stderr, "cannot open /proc/sys/fs/file-nr\n");
+ return 1;
+ }
+ if(1 != fscanf(f, "%*d %*d %d", &avail)) {
+ fclose(f);
+ fprintf(stderr, "cannot read from /proc/sys/fs/file-nr\n");
+ return 1;
+ }
+ fclose(f);
+ puts("graph_title File table usage\n"
+ "graph_args --base 1000 -l 0\n"
+ "graph_vlabel number of open files\n"
+ "graph_category system\n"
+ "graph_info This graph monitors the Linux open files table.\n"
+ "used.label open files\n"
+ "used.info The number of currently open files.\n"
+ "max.label max open files\n"
+ "max.info The maximum supported number of open files. Tune by modifying /proc/sys/fs/file-max.");
+ printf("used.warning %d\nused.critical %d\n", (int)(avail*0.92), (int)(avail*0.98));
+ return 0;
+ }
+ if(!strcmp(argv[1], "autoconf")) {
+ if(0 == access("/proc/sys/fs/file-nr", R_OK))
+ return writeyes();
+ else
+ return writeno("/proc/sys/fs/file-nr not readable");
+ }
+ }
+ if(!(f=fopen("/proc/sys/fs/file-nr", "r"))) {
+ fputs("cannot open /proc/sys/fs/file-nr\n", stderr);
+ return 1;
+ }
+ if(3 != fscanf(f, "%d %d %d", &alloc, &freeh, &avail)) {
+ fclose(f);
+ fputs("cannot read from /proc/sys/fs/file-nr\n", stderr);
+ return 1;
+ }
+ fclose(f);
+ printf("used.value %d\nmax.value %d\n", alloc-freeh, avail);
+ return 0;
+}