Popen3 Class Reference

Inheritance diagram for Popen3:

Public Member Functions
def	__init__
def	poll
def	wait

Data Fields
	pid
	tochild
	fromchild
	childerr
	sts

Static Public Attributes
int	sts = -1

Detailed Description

Class representing a child process.  Normally instances are created
by the factory functions popen2() and popen3().

Definition at line 23 of file popen2.py.

Constructor & Destructor Documentation

def __init__	(		self,
			cmd,
			capturestderr = 0,
			bufsize = -1
	)

The parameter 'cmd' is the shell command to execute in a
sub-process.  The 'capturestderr' flag, if true, specifies that
the object should capture standard error output of the child process.
The default is false.  If the 'bufsize' parameter is specified, it
specifies the size of the I/O buffers to/from the child process.

Definition at line 29 of file popen2.py.

    def __init__(self, cmd, capturestderr=0, bufsize=-1):
        """The parameter 'cmd' is the shell command to execute in a
        sub-process.  The 'capturestderr' flag, if true, specifies that
        the object should capture standard error output of the child process.
        The default is false.  If the 'bufsize' parameter is specified, it
        specifies the size of the I/O buffers to/from the child process."""
        _cleanup()
        p2cread, p2cwrite = os.pipe()
        c2pread, c2pwrite = os.pipe()
        if capturestderr:
            errout, errin = os.pipe()
        self.pid = os.fork()
        if self.pid == 0:
            # Child
            os.dup2(p2cread, 0)
            os.dup2(c2pwrite, 1)
            if capturestderr:
                os.dup2(errin, 2)
            self._run_child(cmd)
        os.close(p2cread)
        self.tochild = os.fdopen(p2cwrite, 'w', bufsize)
        os.close(c2pwrite)
        self.fromchild = os.fdopen(c2pread, 'r', bufsize)
        if capturestderr:
            os.close(errin)
            self.childerr = os.fdopen(errout, 'r', bufsize)
        else:
            self.childerr = None
        _active.append(self)