Polishing:

  1. use MySQL headers instead of system ones;
  2. move logical part of code into a separate function.

server-tools/instance-manager/angel.cc

@@ -17,19 +17,16 @@
 
 #include "angel.h"
 
-#include <signal.h>
-#include <string.h>
-
-#include <sys/stat.h>
-#include <sys/types.h>
 #include <sys/wait.h>
-
 /*
-  Include my_global.h right after system includes so that we can change
-  system defines if needed.
+  sys/wait.h is needed for waitpid(). Unfortunately, there is no MySQL
+  include file, that can serve for this. Include it before MySQL system
+  headers so that we can change system defines if needed.
 */
 
 #include "my_global.h"
+#include "my_alarm.h"
+#include "my_sys.h"
 
 /* Include other IM files. */
 

server-tools/instance-manager/manager.cc

@@ -184,6 +184,53 @@ void Manager::stop_all_threads()
 }
 
 
+/**
+  Initialize user map and load password file.
+
+  SYNOPSIS
+    init_user_map()
+
+  RETURN
+    FALSE   on success
+    TRUE    on failure
+*/
+
+bool Manager::init_user_map(User_map *user_map)
+{
+  int err_code;
+  const char *err_msg;
+
+  if (user_map->init())
+  {
+    log_error("Manager: can not initialize user list: out of memory.");
+    return TRUE;
+  }
+
+  err_code= user_map->load(Options::Main::password_file_name, &err_msg);
+
+  if (!err_code)
+    return FALSE;
+
+  if (err_code == ERR_PASSWORD_FILE_DOES_NOT_EXIST &&
+      Options::Main::mysqld_safe_compatible)
+  {
+    /*
+      The password file does not exist, but we are running in
+      mysqld_safe-compatible mode. Continue, but complain in log.
+    */
+
+    log_info("Warning: password file does not exist, "
+             "nobody will be able to connect to Instance Manager.");
+
+    return FALSE;
+  }
+
+  log_error("Manager: %s.", (const char *) err_msg);
+
+  return TRUE;
+}
+
+
 /**
   Main manager function.
 
@@ -201,9 +248,7 @@ void Manager::stop_all_threads()
 
 int Manager::main()
 {
-  int err_code;
   int rc= 1;
-  const char *err_msg;
   bool shutdown_complete= FALSE;
   pid_t manager_pid= getpid();
 
@@ -258,33 +303,10 @@ int Manager::main()
     return 1;
   }
 
-  /* Initialize user map and load password file. */
-
-  if (user_map.init())
-  {
-    log_error("Manager: can not initialize user list: out of memory.");
-    return 1;
-  }
-
-  if ((err_code= user_map.load(Options::Main::password_file_name, &err_msg)))
-  {
-    if (err_code == ERR_PASSWORD_FILE_DOES_NOT_EXIST &&
-        Options::Main::mysqld_safe_compatible)
-    {
-      /*
-        The password file does not exist, but we are running in
-        mysqld_safe-compatible mode. Continue, but complain in log.
-      */
+  /* Initialize user db. */
 
-      log_info("Warning: password file does not exist, "
-               "nobody will be able to connect to Instance Manager.");
-    }
-    else
-    {
-      log_error("Manager: %s.", (const char *) err_msg);
-      return 1;
-    }
-  }
+  if (init_user_map(&user_map))
+    return 1; /* logging has been already done. */
 
   /* Write Instance Manager pid file. */
 

server-tools/instance-manager/manager.h

@@ -51,6 +51,7 @@ class Manager
 
 private:
   static void stop_all_threads();
+  static bool init_user_map(User_map *user_map);
 
 private:
   static Guardian *p_guardian;

server-tools/instance-manager/mysqlmanager.cc

@@ -62,7 +62,7 @@
       mysql subsystem.
 */
 
-static int im_main(int argc, char *argv[]);
+static int main_impl(int argc, char *argv[]);
 
 #ifndef __WIN__
 static struct passwd *check_user();
@@ -90,7 +90,7 @@ int main(int argc, char *argv[])
 
   log_info("IM: started.");
 
-  return_value= im_main(argc, argv);
+  return_value= main_impl(argc, argv);
 
   log_info("IM: finished.");
 
@@ -108,7 +108,7 @@ int main(int argc, char *argv[])
   Instance Manager main functionality.
 *************************************************************************/
 
-int im_main(int argc, char *argv[])
+int main_impl(int argc, char *argv[])
 {
   int rc;