/*=========================================================================

  Program:   KWSys - Kitware System Library
  Module:    $RCSfile$
  Language:  C++
  Date:      $Date$
  Version:   $Revision$

  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
  See http://www.cmake.org/HTML/Copyright.html for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#ifndef @KWSYS_NAMESPACE@_Process_h
#define @KWSYS_NAMESPACE@_Process_h

#define kwsys(x) @KWSYS_NAMESPACE@##x
#define kwsysProcess_STDOUT kwsys(Process_STDOUT)
#define kwsysProcess_STDERR kwsys(Process_STDERR)
#define kwsysProcess_Timeout kwsys(Process_Timeout)
#define kwsysProcess_Starting kwsys(Process_Starting)
#define kwsysProcess_Executing kwsys(Process_Executing)
#define kwsysProcess_Expired kwsys(Process_Expired)
#define kwsysProcess_Exited kwsys(Process_Exited)
#define kwsysProcess_Killed kwsys(Process_Killed)
#define kwsysProcess_Signalled kwsys(Process_Signalled)
#define kwsysProcess_Error kwsys(Process_Error)
#define kwsysProcess_State kwsys(Process_State)
#define kwsysProcess_Pipes_e kwsys(Process_Pipes_e)
#define kwsysProcess_State_e kwsys(Process_State_e)
#define kwsysProcess_s kwsys(Process_s)
#define kwsysProcess kwsys(Process)
#define kwsysProcess_New kwsys(Process_New)
#define kwsysProcess_Delete kwsys(Process_Delete)
#define kwsysProcess_SetCommand kwsys(Process_SetCommand)
#define kwsysProcess_SetTimeout kwsys(Process_SetTimeout)
#define kwsysProcess_GetState kwsys(Process_GetState)
#define kwsysProcess_GetExitCode kwsys(Process_GetExitCode)
#define kwsysProcess_GetErrorString kwsys(Process_GetErrorString)
#define kwsysProcess_Execute kwsys(Process_Execute)
#define kwsysProcess_WaitForData kwsys(Process_WaitForData)
#define kwsysProcess_WaitForExit kwsys(Process_WaitForExit)
#define kwsysProcess_Kill kwsys(Process_Kill)

#if defined(__cplusplus)
extern "C"
{
#endif

typedef enum kwsysProcess_Pipes_e
{
  kwsysProcess_STDOUT=1,
  kwsysProcess_STDERR=2,
  kwsysProcess_Timeout=255
} kwsysProcess_Pipes;

typedef enum kwsysProcess_State_e
{
  kwsysProcess_Starting,  /* Between New and Execute; No process run yet */
  kwsysProcess_Executing, /* Process is running */
  kwsysProcess_Expired,   /* Process timeout expired and was killed */
  kwsysProcess_Exited,    /* Process exited */
  kwsysProcess_Killed,    /* Process was killed by Kill */
  kwsysProcess_Signalled, /* Process was terminated by a signal (crash / ctrl-C) */
  kwsysProcess_Error      /* Internal error of Process */
} kwsysProcess_State;

typedef struct kwsysProcess_s kwsysProcess;

kwsysProcess* kwsysProcess_New();

void kwsysProcess_Delete(kwsysProcess* cp);

void kwsysProcess_SetCommand(kwsysProcess* cp, char const* const* command);

void kwsysProcess_SetTimeout(kwsysProcess* cp, double timeout);

/*
 * Get the current internal state of the kwsysProcess instance
 */
int kwsysProcess_GetState(kwsysProcess* cp);

/*
 * Get process return code or when signalled, get the signal code 
 */
int kwsysProcess_GetExitCode(kwsysProcess* cp);

/*
 * On kwsysProcess_Error get the error message
 */
const char* kwsysProcess_GetErrorString(kwsysProcess* cp);

void kwsysProcess_Execute(kwsysProcess* cp);

/*
 * Block until data available on requested pipe or one of the timeouts expired,
 * or the process exits. If the pipe is not specified, data on that pipe are
 * ignored.
 *
 * pipes - a list of interested pipes - kwsysProcess_STDOUT | kwsysProcess_STDERR
 * data - returns pointer to data if read, NULL otherwise
 * length - length of the returned data
 * userTimeout - timeout for the current kwsysProcess_WaitForData call
 *     the userTimeout will contain the remaining time
 *
 * Returns:
 *    0 - Process exited or killed or process timeout expired with no data
 *        available, or no process running.
 *    PIPE id otherwise:
 *       kwsysProcess_STDOUT - if stdout is returned
 *       kwsysProcess_STDERR - if stderr is returned
 *       kwsysProcess_Timeout - if user timeout expired
 */ 
int kwsysProcess_WaitForData(kwsysProcess* cp, int pipes, char** data, int* length,
                          double* userTimeout);

/*
 * Block until the process exits or the timeout expires. If no process is
 * running, return immediatly.
 *
 * Returns:
 *    0 - When user timeout expires
 *    1 - Otherwise
 */
int kwsysProcess_WaitForExit(kwsysProcess* cp, double* userTimeout);

/* 
 * Kills the process.  kwsysProcess_WaitForExit should still be called
 * after kwsysProcess_Kill.
 */
void kwsysProcess_Kill(kwsysProcess* cp);

#if defined(__cplusplus)
} /* extern "C" */
#endif


/* If we are building a kwsysProcess .c file, let it use these macros.  */
#if !defined(KWSYS_IN_PROCESS_C)
# undef kwsys
# undef kwsysProcess_STDOUT
# undef kwsysProcess_STDERR
# undef kwsysProcess_Timeout
# undef kwsysProcess_Starting
# undef kwsysProcess_Executing
# undef kwsysProcess_Expired
# undef kwsysProcess_Exited
# undef kwsysProcess_Killed
# undef kwsysProcess_Signalled
# undef kwsysProcess_Error
# undef kwsysProcess_State
# undef kwsysProcess_Pipes_e
# undef kwsysProcess_State_e
# undef kwsysProcess_s
# undef kwsysProcess
# undef kwsysProcess_New
# undef kwsysProcess_Delete
# undef kwsysProcess_SetCommand
# undef kwsysProcess_SetTimeout
# undef kwsysProcess_GetState
# undef kwsysProcess_GetExitCode
# undef kwsysProcess_GetErrorString
# undef kwsysProcess_Execute
# undef kwsysProcess_WaitForData
# undef kwsysProcess_WaitForExit
# undef kwsysProcess_Kill
#endif

#endif