NSTask and pseudo TTY
NSTask and pseudo TTY
- Subject: NSTask and pseudo TTY
- From: "James W. Walker" <email@hidden>
- Date: Sun, 28 Mar 2010 11:56:27 -0700
I've been running NSTask and reading the output using -[NSFileHandle readInBackgroundAndNotify], but in certain situations there was a problem: Due to the block buffering of standard output, I wasn't getting notified as soon as some output had been produced. I don't have control over the code being run by NSTask. Some googling led me to believe that I need to use a pseudo tty instead of NSPipe to communicate with the NSTask. So, I called openpty, wrapped the file descriptors in NSFileHandles, set the slave handle as standard output of the NSTask, and called [masterHandle readInBackgroundAndNotify]. This almost worked. The problem is that I can't tell when the output is done. When I was using NSPipe, my NSFileHandleReadCompletionNotification observer method would get an NSData of length 0, which told me that there was no more data. Now, that doesn't happen. I tried observing NSTaskDidTerminateNotification, but that notification arrives before I've received all the data. Attempting to read more data with -[NSFileHandle availableData] just hangs.
Can anyone lead me out of this mire?
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