src/child.h

   1 /*
   2  * Copyright (c) 2004 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25
  26
  27 //
  28 // child - track a single child process and its belongings
  29 //
  30 #ifndef _CHILD_H_
  31 #define _CHILD_H_  1
  32
  33 #include "securityserver.h"
  34
  35 class Child;
  36
  37 //
  38 // ChildManager - Singleton Child Manager class
  39 //
  40 class ChildManager
  41 {
  42 public:
  43     // The singleton childManager.
  44     static ChildManager childManager;
  45
  46     ChildManager();
  47     ~ChildManager();
  48
  49     // Return true in the child.  Return false in the parent and set outChildPort to 0 if the child died prematuely.  In this case outWaitStatus contains the result of a waitpid() on the child.  if outChildPort is non 0 it's a send right to contact the child on.
  50     bool forkChild(mach_port_t &outChildPort, int &outWaitStatus);
  51
  52     // SigChild signal handler
  53     void handleSignal(int signal);
  54
  55     // Be notified a child just contacted us on our main server port telling us it's child port.  Set childPort to 0 iff we don't wish it to be deallocated by our caller.
  56     void registerChild(pid_t pid, mach_port_t &childPort);
  57
  58     // Assumes mLock is not locked (called by Child's eraseFromMap() function).
  59     void eraseChild(pid_t pid);
  60
  61     // Assumes mLock is already locked (called by Child's insertInMap() function).
  62     void insertChild(pid_t pid, Child *child);
  63
  64 private:
  65     Child *findChild(pid_t pid);
  66
  67     void handleSigChild();
  68
  69     // Be notifed of a term or signal waitpid() status.
  70     void waitStatusForPid(pid_t pid, int status);
  71
  72
  73     typedef std::map<pid_t, Child *> ChildMap;
  74     ChildMap mChildMap;
  75     Mutex mLock;
  76 };
  77
  78
  79 #endif // _CHILD_H_