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contrib-munin/tools/munin-plugins-busybox/threads.c
2013-02-05 13:12:43 +01:00

71 lines
1.5 KiB
C

#include <ctype.h>
#include <dirent.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include "common.h"
int threads(int argc, char **argv) {
FILE *f;
char buff[256];
const char *s;
int i, sum;
DIR *d;
struct dirent *e;
if(argc > 1) {
if(!strcmp(argv[1], "autoconf")) {
i = getpid();
sprintf(buff, "/proc/%d/status", i);
if(NULL == (f = fopen(buff, "r")))
return fail("failed to open /proc/$$/status");
while(fgets(buff, 256, f))
if(!strncmp(buff, "Threads:", 8)) {
fclose(f);
return writeyes();
}
fclose(f);
puts("no");
return 0;
}
if(!strcmp(argv[1], "config")) {
puts("graph_title Number of threads\n"
"graph_vlabel number of threads\n"
"graph_category processes\n"
"graph_info This graph shows the number of threads.\n"
"threads.label threads\n"
"threads.info The current number of threads.");
return 0;
}
}
if(NULL == (d = opendir("/proc")))
return fail("cannot open /proc");
sum = 0;
while((e = readdir(d))) {
for(s=e->d_name;*s;++s)
if(!isdigit(*s))
break;
if(*s) /* non-digit found */
continue;
snprintf(buff, 256, "/proc/%s/status", e->d_name);
if(!(f = fopen(buff, "r")))
continue; /* process has vanished */
while(fgets(buff, 256, f)) {
if(strncmp(buff, "Threads:", 8))
continue;
if(1 != sscanf(buff+8, "%d", &i)) {
fclose(f);
closedir(d);
return fail("failed to parse "
"/proc/somepid/status");
}
sum += i;
}
fclose(f);
}
closedir(d);
printf("threads.value %d\n", sum);
return 0;
}