Call nanosleep instead of sleep in polling loop

This avoids unnecessary rt_sigprocmask and rt_sigaction system calls.

Author: gaul

src/mbpfan.c

@@ -32,6 +32,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <string.h>
+#include <time.h>
 #include <math.h>
 #include <syslog.h>
 #include <stdbool.h>
@@ -571,6 +572,11 @@ void mbpfan()
             }
         }
 
-        sleep(polling_interval);
+        // call nanosleep instead of sleep to avoid rt_sigprocmask and
+        // rt_sigaction
+        struct timespec ts;
+        ts.tv_sec = polling_interval;
+        ts.tv_nsec = 0;
+        nanosleep(&ts, NULL);
     }
 }