!407 fix: 提高watcher_dog 的优先级

Merge pull request !407 from 熊磊/init311_1

watchdog/BUILD.gn

@@ -23,7 +23,10 @@ if (defined(ohos_lite)) {
       "//base/startup/init_lite/interfaces/innerkits/include",
     ]
     deps = [ "//base/startup/init_lite/services/log:init_log" ]
-    defines = [ "_GNU_SOURCE" ]
+    defines = [
+      "_GNU_SOURCE",
+      "OHOS_LITE_WATCHDOG",
+    ]
     if (ohos_kernel_type == "linux") {
       defines += [ "LINUX_WATCHDOG" ]
     }

watchdog/init_watchdog.c

@@ -15,8 +15,10 @@
 
 #include <errno.h>
 #include <fcntl.h>
+#include <sched.h>
 #include <stdlib.h>
 #include <sys/ioctl.h>
+#include <sys/resource.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <time.h>
@@ -75,7 +77,13 @@ int main(int argc, const char *argv[])
     gap = (gap > 0) ? gap : DEFAULT_GAP;
 
     INIT_LOGI("watchdoge started (interval %d, margin %d), fd = %d\n", interval, gap, fd);
-
+#ifdef OHOS_LITE_WATCHDOG
+#ifndef LINUX_WATCHDOG
+    if (setpriority(PRIO_PROCESS, 0, 14) != 0) { // 14 is process priority
+        INIT_LOGE("setpriority failed err=%d\n", errno);
+    }
+#endif
+#endif
     int timeoutSet = interval + gap;
     int timeoutGet = 0;
     int ret = ioctl(fd, WDIOC_SETTIMEOUT, &timeoutSet);