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#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include "common.h"
#define FS_FILE_NR "/proc/sys/fs/file-nr"
int open_files(int argc, char **argv) {
FILE *f;
int alloc, freeh, avail;
if(argc > 1) {
if(!strcmp(argv[1], "config")) {
if(!(f=fopen(FS_FILE_NR, "r"))) {
fprintf(stderr, "cannot open " FS_FILE_NR "\n");
return 1;
}
if(1 != fscanf(f, "%*d %*d %d", &avail)) {
fclose(f);
fprintf(stderr, "cannot read from " 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 " FS_FILE_NR
".");
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(FS_FILE_NR, R_OK))
return writeyes();
else
return writeno(FS_FILE_NR " not readable");
}
}
if(!(f=fopen(FS_FILE_NR, "r"))) {
fputs("cannot open " FS_FILE_NR "\n", stderr);
return 1;
}
if(3 != fscanf(f, "%d %d %d", &alloc, &freeh, &avail)) {
fclose(f);
fputs("cannot read from " FS_FILE_NR "\n", stderr);
return 1;
}
fclose(f);
printf("used.value %d\nmax.value %d\n", alloc-freeh, avail);
return 0;
}
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