ACE_Process Class Reference

Process. More...

#include <Process.h>

Inheritance diagram for ACE_Process:

Inheritance graph
Collaboration diagram for ACE_Process:

Collaboration graph
List of all members.

Public Member Functions

 ACE_Process (void)
 Default construction. Must use <ACE_Process::spawn> to start.
virtual ~ACE_Process (void)
virtual int prepare (ACE_Process_Options &options)
virtual pid_t spawn (ACE_Process_Options &options)
virtual void parent (pid_t child)
virtual void child (pid_t parent)
virtual void unmanage (void)
pid_t wait (ACE_exitcode *status=0, int wait_options=0)
pid_t wait (const ACE_Time_Value &tv, ACE_exitcode *status=0)
int kill (int signum=SIGINT)
int terminate (void)
pid_t getpid (void) const
 Return the process id of the new child process.
ACE_HANDLE gethandle (void) const
 Return the handle of the process, if it has one.
int running (void) const
 Return 1 if running; 0 otherwise.
ACE_exitcode exit_code (void) const
int return_value (void) const
void close_dup_handles (void)
void close_passed_handles (void)
PROCESS_INFORMATION process_info (void)

Protected Member Functions

void exit_code (ACE_exitcode code)

Protected Attributes

ACE_exitcode exit_code_
ACE_Handle_Set handles_passed_
 Set of handles that were passed to the child process.
ACE_Handle_Set dup_handles_
 Handle duplicates made for the child process.

Private Member Functions

 ACE_Process (const ACE_Process &)
void operator= (const ACE_Process &)


class ACE_Process_Manager

Detailed Description


A Portable encapsulation for creating new processes. Notice that on UNIX platforms, if the <setenv> is used, the <spawn> is using the <execve> system call. It means that the <command_line> should include a full path to the program file (<execve> does not search the PATH). If <setenv> is not used then, the <spawn> is using the <execvp> which searches for the program file in the PATH variable.

Constructor & Destructor Documentation


Default construction. Must use <ACE_Process::spawn> to start.

ACE_Process::~ACE_Process ( void   )  [virtual]


ACE_Process::ACE_Process ( const ACE_Process  )  [private]

Member Function Documentation

void ACE_Process::child ( pid_t  parent  )  [virtual]

Called just after <ACE_OS::fork> in the child's context. The default does nothing. This function is *not* called on Win32 because the process-creation scheme does not allow it.

void ACE_Process::close_dup_handles ( void   ) 

Close all the handles in the set obtained from the

void ACE_Process::close_passed_handles ( void   ) 

Close all the handles in the set obtained from the

ACE_INLINE void ACE_Process::exit_code ( ACE_exitcode  code  )  [protected]

Set this process' <exit_code_>. ACE_Process_Manager uses this method to set the <exit_code_> after successfully waiting for this process to exit.

ACE_INLINE ACE_exitcode ACE_Process::exit_code ( void   )  const

Return the Process' exit code. This method returns the raw exit status returned from system APIs (such as <wait> or <waitpid>). This value is system dependent.

ACE_INLINE ACE_HANDLE ACE_Process::gethandle ( void   )  const

Return the handle of the process, if it has one.

ACE_INLINE pid_t ACE_Process::getpid ( void   )  const

Return the process id of the new child process.

ACE_INLINE int ACE_Process::kill ( int  signum = SIGINT  ) 

Send the process a signal. This is only portable to operating systems that support signals, such as UNIX/POSIX.

void ACE_Process::operator= ( const ACE_Process  )  [private]

void ACE_Process::parent ( pid_t  child  )  [virtual]

Called just after <ACE_OS::fork> in the parent's context, if the <fork> succeeds. The default is to do nothing.

int ACE_Process::prepare ( ACE_Process_Options options  )  [virtual]

Called just before <ACE_OS::fork> in the <spawn>. If this returns non-zero, the <spawn> is aborted (and returns ACE_INVALID_PID). The default simply returns zero.


ACE_INLINE int ACE_Process::return_value ( void   )  const

Return the Process' return value. This method returns the actual return value that a child process returns or <exit>s.

int ACE_Process::running ( void   )  const

Return 1 if running; 0 otherwise.

pid_t ACE_Process::spawn ( ACE_Process_Options options  )  [virtual]

Launch a new process as described by options. On success, returns 1 if the option avoid_zombies is set, else returns the process id of the newly spawned child. Returns -1 on failure. This will be fixed in the future versions of ACE when the process id of the child will be returned regardless of the option.

ACE_INLINE int ACE_Process::terminate ( void   ) 

Terminate the process abruptly using <ACE::terminate_process>. This call doesn't give the process a chance to cleanup, so use it with caution...

void ACE_Process::unmanage ( void   )  [virtual]

Called by a <Process_Manager> that is removing this Process from its table of managed Processes. Default is to do nothing.

Reimplemented in ACE_Managed_Process.

pid_t ACE_Process::wait ( const ACE_Time_Value tv,
ACE_exitcode status = 0 

Timed wait for the process we've created to exit. A return value of -1 indicates that the something failed; 0 indicates that a timeout occurred. Otherwise, the child's process id is returned. If <status> != 0, it points to an integer where the function stores the child's exit status.

On UNIX platforms this function uses <ualarm>, i.e., it overwrites any existing alarm. In addition, it steals all <SIGCHLD>s during the timeout period, which will break another <ACE_Process_Manager> in the same process that's expecting <SIGCHLD> to kick off process reaping.

ACE_INLINE pid_t ACE_Process::wait ( ACE_exitcode status = 0,
int  wait_options = 0 

Wait for the process we've created to exit. If <status> != 0, it points to an integer where the function store the exit status of child process to. If <wait_options> == <WNOHANG> then return 0 and don't block if the child process hasn't exited yet. A return value of -1 represents the <wait> operation failed, otherwise, the child process id is returned.

Friends And Related Function Documentation

friend class ACE_Process_Manager [friend]

Member Data Documentation

ACE_Handle_Set ACE_Process::dup_handles_ [protected]

Handle duplicates made for the child process.

ACE_exitcode ACE_Process::exit_code_ [protected]

ACE_Handle_Set ACE_Process::handles_passed_ [protected]

Set of handles that were passed to the child process.

PROCESS_INFORMATION ACE_Process::process_info_ [protected]

The documentation for this class was generated from the following files:
Generated on Fri Oct 6 15:23:16 2006 for ACE by  doxygen 1.4.7-1