apps/examples/oneshot: If the requested delay is > max_delay, then break the delay up into several pieces.

examples/oneshot/oneshot_main.c

@@ -106,6 +106,8 @@ int oneshot_main(int argc, char *argv[])
   unsigned long secs;
   struct oneshot_start_s start;
   struct siginfo info;
+  struct timespec ts;
+  uint64_t maxus;
   sigset_t set;
   int ret;
   int fd;
@@ -158,12 +160,36 @@ int oneshot_main(int argc, char *argv[])
       return EXIT_FAILURE;
     }
 
+  /* Get the maximum delay */
+
+  ret = ioctl(fd, OSIOC_MAXDELAY, (unsigned long)((uintptr_t)&ts));
+  if (ret < 0)
+    {
+      fprintf(stderr, "ERROR: Failed to get the maximum delayl: %d\n",
+             errno);
+      close(fd);
+      return EXIT_FAILURE;
+    }
+
+  maxus = (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000;
+
+  printf("Maximum delay is %llu\n", maxus);
+
+  /* Loop waiting until the full delay expires */
+
+  while (usecs > 0)
+    {
       /* Start the oneshot timer */
 
       sigemptyset(&set);
       sigaddset(&set, CONFIG_EXAMPLE_ONESHOT_SIGNO);
 
-  printf("Starting oneshot timer with delay %lu microseconds\n", usecs);
+      if (usecs < maxus)
+        {
+          /* Wait for the remaining time */
+
+          printf("Starting oneshot timer with delay %lu microseconds\n",
+                 usecs);
 
           start.pid        = 0;
           start.signo      = CONFIG_EXAMPLE_ONESHOT_SIGNO;
@@ -175,6 +201,23 @@ int oneshot_main(int argc, char *argv[])
           start.ts.tv_sec  = secs;
           start.ts.tv_nsec = usecs * 1000;
   
+          /* Zero usecs to terminate the loop */
+
+          usecs            = 0;
+        }
+      else
+        {
+          /* Wait for the maximum */
+
+          printf("Starting oneshot timer with delay %llu microseconds\n",
+                 maxus);
+
+          start.ts.tv_sec  = ts.tv_sec;
+          start.ts.tv_nsec = ts.tv_nsec;
+
+          usecs           -= maxus;
+        }
+
       ret = ioctl(fd, OSIOC_START, (unsigned long)((uintptr_t)&start));
       if (ret < 0)
         {
@@ -195,6 +238,7 @@ int oneshot_main(int argc, char *argv[])
           close(fd);
           return EXIT_FAILURE;
         }
+    }
 
   /* Close the oneshot driver */