classification
Title: Python behavioral difference between Linux and AIX
Type: Stage:
Components: Versions:
process
Status: open Resolution:
Dependencies: Superseder:
Assigned To: Nosy List: addaleax, aixtools@gmail.com, ericvw, gireeshpunathil
Priority: normal Keywords:

Created on 2017-02-13 15:46 by gireeshpunathil, last changed 2017-03-17 15:48 by aixtools@gmail.com.

Messages (2)
msg287706 - (view) Author: Gireesh (gireeshpunathil) Date: 2017-02-13 15:46
Here is my python code (parent):

#!/usr/bin/env python
import errno
import os
import pty
from subprocess import Popen, STDOUT

master_fd, slave_fd = pty.openpty()
proc = Popen(['./a.out'],stdout=slave_fd, close_fds=True)
os.close(slave_fd)
data = os.read(master_fd, 512)
print('got ' + repr(data))

Child(C++):
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>

int main()
{
        printf("hello world\n");
        exit(0);
}

behavior: 
Linux:
got 'hello world\r\r\n'
AIX: Hangs.

versions:
Linux:
Linux 2.6.32-131.12.1.el6.x86_64 #1 SMP Sun Jul 31 16:44:56 EDT 2011 
x86_64 x86_64 x86_64 GNU/Linux
AIX: 1 6 00F460A94C00
Python: 2.7.10
msg289766 - (view) Author: Michael Felt (aixtools@gmail.com) Date: 2017-03-17 15:48
Curious.

First pass: using python2.7.12 also hanged as program, on the close()

second pass: interactive - do the read first, then the close - seems to work:

root@x064:[/data/prj/python/issues/29545]cat hello.py
#!/usr/bin/env python
import errno
import os
import pty
from subprocess import Popen, STDOUT

master_fd, slave_fd = pty.openpty()
proc = Popen(['./hello'],stdout=slave_fd, close_fds=True)
os.close(slave_fd)
data = os.read(master_fd, 512)
print('got ' + repr(data))
root@x064:[/data/prj/python/issues/29545]python
Python 2.7.12 (default, Sep 29 2016, 12:02:17) [C] on aix5
Type "help", "copyright", "credits" or "license" for more information.
>>> import errno
import os
import pty
from subprocess import Popen, STDOUT
>>> >>> >>> >>>
>>> master_fd, slave_fd = pty.openpty()
>>> master_fd
3
>>> slave_fd
4
>>> proc = Popen(['./hello'],stdout=slave_fd, close_fds=True)
>>> data = os.read(master_fd, 512)
>>> datat
'hello world\r\n'
>>> os.close(slave_fd)
>>> print (got '
  File "<stdin>", line 1
    print (got '
               ^
SyntaxError: EOL while scanning string literal
>>> print('got ' + repr(data))
got 'hello world\r\n'
>>> quit()

pass 3:
swap the close() and the read() and the program works fine.

"hello.py" 11 lines, 265 characters

root@x064:[/data/prj/python/issues/29545]cat hello.py
#!/usr/bin/env python
import errno
import os
import pty
from subprocess import Popen, STDOUT

master_fd, slave_fd = pty.openpty()
proc = Popen(['./hello'],stdout=slave_fd, close_fds=True)
data = os.read(master_fd, 512)
os.close(slave_fd)
print('got ' + repr(data))

root@x064:[/data/prj/python/issues/29545]./hello.py
got 'hello world\r\n'
root@x064:[/data/prj/python/issues/29545]
History
Date User Action Args
2017-03-17 15:48:23aixtools@gmail.comsetnosy: + aixtools@gmail.com
messages: + msg289766
2017-03-06 16:38:10addaleaxsetnosy: + addaleax
2017-02-13 16:33:17ericvwsetnosy: + ericvw
2017-02-13 15:46:52gireeshpunathilcreate