process.h

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// Copyright (C) 1999-2002 Open Source Telecom Corporation.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
// 
// As a special exception to the GNU General Public License, permission is 
// granted for additional uses of the text contained in its release
// of Common C++.
// 
// The exception is that, if you link the Common C++ library with other
// files to produce an executable, this does not by itself cause the
// resulting executable to be covered by the GNU General Public License.
// Your use of that executable is in no way restricted on account of
// linking the Common C++ library code into it.
//
// This exception does not however invalidate any other reasons why
// the executable file might be covered by the GNU General Public License.
//
// This exception applies only to the code released under the 
// name Common C++.  If you copy code from other releases into a copy of
// Common C++, as the General Public License permits, the exception does
// not apply to the code that you add in this way.  To avoid misleading
// anyone as to the status of such modified files, you must delete
// this exception notice from them.
//
// If you write modifications of your own for Common C++, it is your choice
// whether to permit this exception to apply to your modifications.
// If you do not wish that, delete this exception notice.

#ifndef CCXX_PROCESS_H_
#define CCXX_PROCESS_H_

#ifndef CCXX_CONFIG_H_
#include <cc++/config.h>
#endif

#ifndef CCXX_THREAD_H_
#include <cc++/thread.h>
#endif

#ifdef  CCXX_NAMESPACES
namespace ost {
#endif

class __EXPORT Process
{
public:
#ifndef WIN32
        typedef RETSIGTYPE (*Trap)(int);
        static void detach(void);

        static void attach(const char *devname);

        static Trap setPosixSignal(int signo, Trap handler);

        static Trap setInterruptSignal(int signo, Trap handler);
#endif

        bool lock(bool future = true);

        void unlock(void);
        
        static int spawn(const char *exec, const char **argv, bool wait = true);

        static int join(int pid);

        static bool cancel(int pid, int sig = 0);

        static const char *getEnv(const char *name);

        static void setEnv(const char *name, const char *value, bool overwrite);

        static const char *getConfigDir(void)
                {return ETC_PREFIX;};

        static const char *getHomeDir(void);

        static const char *getUser(void);

        static bool setUser(const char *id, bool grp = true);

        static bool setGroup(const char *id);

        static size_t getPageSize(void);

        static void setPriority(int pri);

        static void setScheduler(const char *policy);

        static void setRealtime(int pri = 0);

        static bool isScheduler(void);
};

class __EXPORT Lockfile
{
private:
#ifdef  WIN32
        HANDLE  _mutex;
        bool    _flagged;
#else
        char *_path;
#endif

public:
        Lockfile(const char *name);

        Lockfile();

        ~Lockfile()
                {unlock();};

        bool lock(const char *name);

        void unlock(void);

        bool isLocked(void);
};

#ifdef  CCXX_NAMESPACES
}
#endif

#endif

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