Re: pty tcdrain() bug in 2.6.27 to 2.6.30/current

[Alan Cox]

> manner. The following test case reproduces the bug, and hangs only on affected 
> kernels. Examination of 2.6.26 and 2.6.27 suggests the ioctl used by tcdrain 
> underwent a rewrite for 2.6.27, and thus fixing this bug is beyond my 
> capabilities at this time.

I don't see a bug at this point

> 	slavefd = open(ptsname(masterfd), O_NOCTTY | O_RDWR);
> 	assert(slavefd != -1);
> 	
> 	assert(sizeof(test) == write(slavefd, test, sizeof(test)));

Queue data to the other end...

> 	assert(!tcdrain(slavefd));

Wait for it to be read, but with nothing reading it.

So it waits as it should.


What is the bug here ?

Alan
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