init: demo execv()

apps/Makefile

@@ -1,4 +1,4 @@
-APPS := init
+APPS := init sym
 
 APPS_DIR := $(LUNA_ROOT)/apps
 APPS_SRC := $(APPS_DIR)/src

apps/src/init.c

@@ -117,7 +117,17 @@ int main()
 
     if (fclose(config) < 0) { perror("fclose"); }
 
-    printf("\n\nPress any key to restart.\n");
+    sleep(2);
+
+    printf("\n\nPress any key to restart.\n\n");
+
+    sleep(2);
+
+    if (execv("/bin/sym", NULL) < 0)
+    {
+        perror("execv");
+        return 1;
+    }
 
     return 0;
 }

apps/src/sym.c

@@ -0,0 +1,35 @@
+#include <stdio.h>
+#include <string.h>
+
+int main()
+{
+    FILE* syms = fopen("/sys/moon.sym", "r");
+    if (!syms)
+    {
+        perror("fopen");
+        return 1;
+    }
+
+    char buf[1025];
+
+    if (fseek(syms, 8000, SEEK_SET) < 0)
+    {
+        perror("fseek");
+        return 1;
+    }
+
+    size_t nread = fread(buf, 1024, 1, syms);
+    if (ferror(syms))
+    {
+        perror("fread");
+        return 1;
+    }
+
+    buf[nread] = 0;
+
+    printf("%s\n", strchr(buf, '\n') + 1);
+
+    fclose(syms);
+
+    return 0;
+}