CloseProgram leaves zombie processes

deseven · **Posted:** Sat Sep 26, 2020 9:16 am

This will create around 20 zombie processes, can be seen in pstree or just use 'ps ax | grep echo'.

Code:

OpenWindow(0,100,100,400,300,"run program test")

For i = 1 To 100
  pid = RunProgram("/bin/echo","111","",#PB_Program_Write|#PB_Program_Open)
  CloseProgram(pid)
Next

Repeat : Until WaitWindowEvent() = #PB_Event_CloseWindow

deseven · **Posted:** Sat Sep 26, 2020 12:13 pm

Launching the process and writing to it directly through Cocoa doesn't leave any zombie processes:

Code:

  task = CocoaMessage(0,CocoaMessage(0,0,"NSTask alloc"),"init")
  CocoaMessage(0,task,"setLaunchPath:$",@"/bin/echo")
  writePipe = CocoaMessage(0,0,"NSPipe pipe")
  writeHandle = CocoaMessage(0,writePipe,"fileHandleForWriting")
  CocoaMessage(0,task,"setStandardInput:",writePipe)
  CocoaMessage(0,task,"launch")
  string = CocoaMessage(0,0,"NSString stringWithString:$",@"111")
  string = CocoaMessage(0,string,"dataUsingEncoding:",#NSUTF8StringEncoding)
  CocoaMessage(0,writeHandle,"writeData:",string)
  CocoaMessage(0,writeHandle,"closeFile")
  CocoaMessage(0,task,"release")

UPD: I'm aware that passing an argument and writing to stdin are two different things, i just wasn't sure what #PB_Program_Write does under the hood so i decided it would make sense to write a full writing procedure on Cocoa.

PureBasic Forum

CloseProgram leaves zombie processes

Who is online