Improved sleep handling in statusloop

blocks.h

@@ -1,6 +1,3 @@
-/* time interval in seconds to sleep before looking for updates in the main loop */
-#define SLEEPINTERVAL                   1
-
 #define PATH(name)                      "/home/ashish/.local/projects/dwmblocks/blocks/"name
 
 /* If interval of a block is set to 0, the block will only be updated once at startup.
@@ -13,6 +10,11 @@
 /* pathu - path of the program whose output is to be used for status text
  *         output of the program should have a null or newline character at the end
  * pathc - path of the program to be executed on clicks */
+
+/* 1 interval = INTERVALs seconds, INTERVALn nanoseconds */
+#define INTERVALs                       1
+#define INTERVALn                       0
+
 static Block blocks[] = {
 /*      pathu                           pathc                                   interval        signal */
         { PATH("time.sh"),              NULL,                                   30,             10},

dwmblocks.c

@@ -5,6 +5,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <time.h>
 #include <unistd.h>
 #include <X11/Xlib.h>
 
@@ -192,6 +193,7 @@ void
 statusloop()
 {
         int i;
+        struct timespec t;
 
         /* first run */
         sigprocmask(SIG_BLOCK, &blocksigmask, NULL);
@@ -200,17 +202,19 @@ statusloop()
                         getcmd(block, NILL);
         setroot();
         sigprocmask(SIG_UNBLOCK, &blocksigmask, NULL);
-        sleep(SLEEPINTERVAL);
-        i = SLEEPINTERVAL;
         /* main loop */
-        for (;; i += SLEEPINTERVAL) {
+        for (i = 1;; t.tv_sec = INTERVALs, t.tv_nsec = INTERVALn, i += 1) {
+                while (nanosleep(&t, &t) == -1)
+                        if (errno != EINTR) {
+                                perror("statusloop - nanosleep");
+                                exit(1);
+                        }
                 sigprocmask(SIG_BLOCK, &blocksigmask, NULL);
                 for (Block *block = blocks; block->pathu; block++)
                         if (block->interval > 0 && i % block->interval == 0)
                                 getcmd(block, NILL);
                 setroot();
                 sigprocmask(SIG_UNBLOCK, &blocksigmask, NULL);
-                sleep(SLEEPINTERVAL);
         }
 }