ACE_Process Class Reference

Process. More...

#include <Process.h>

Inheritance diagram for ACE_Process:

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Collaboration diagram for ACE_Process:

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List of all members.

Public Member Functions
	ACE_Process (void)
	Default construction. Must use <ACE_Process::spawn> to start.
virtual	~ACE_Process (void)
	Destructor.
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
PROCESS_INFORMATION	process_info_
pid_t	child_id_
	Process id of the child.
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 &)
wchar_t *	convert_env_buffer (const char *env) const
Friends
class	ACE_Process_Manager

Detailed Description

Process.

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

ACE_Process::ACE_Process ( void )

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

ACE_Process::~ACE_Process ( void ) [virtual]

Destructor.

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

ACE_Process_Options::dup_handles object used to spawn the process.

void ACE_Process::close_passed_handles ( void )

Close all the handles in the set obtained from the

ACE_Process_Options::passed_handles object used to spawn the process.

wchar_t* ACE_Process::convert_env_buffer ( const char * env ) const [private]

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_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_HANDLE ACE_Process::gethandle ( void ) const

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

pid_t ACE_Process::getpid ( void ) const

Return the process id of the new child process.

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.

PROCESS_INFORMATION ACE_Process::process_info ( void )

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.

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.

Note:: 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.

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.