pid()
public
Returns the process ID of a child process associated with ios.
This will be set by IO::popen.
pipe = IO.popen("-")
if pipe
$stderr.puts "In parent, child pid is #{pipe.pid}"
else
$stderr.puts "In child, pid is #{$$}"
end
produces:
In child, pid is 26209
In parent, child pid is 26209
Show source
/*
* call-seq:
* ios.pid => fixnum
*
* Returns the process ID of a child process associated with
* <em>ios</em>. This will be set by <code>IO::popen</code>.
*
* pipe = IO.popen("-")
* if pipe
* $stderr.puts "In parent, child pid is #{pipe.pid}"
* else
* $stderr.puts "In child, pid is #{$$}"
* end
*
* <em>produces:</em>
*
* In child, pid is 26209
* In parent, child pid is 26209
*/
static VALUE
rb_io_pid(io)
VALUE io;
{
OpenFile *fptr;
GetOpenFile(io, fptr);
if (!fptr->pid)
return Qnil;
return INT2FIX(fptr->pid);
}