4 commits

Author	SHA1	Message	Date
Gregory Nutt	f5558cd10e	Unix domain/FIFOs: Fix a race condition between FIFO buffer operations and the opening and closing of FIFOs which necessary when the FIFOs are used to support Unix domain, datagram sockets. The default policy is the deallocate FIFO buffering when the last client closes the pipe. When when used for datagram communicatinos, packets left in the FIFO will be lost. Some like UDP read-ahead is needed: The buffered data in the FIFO needs to be retained until the reader gets a chance to re-open the FIFO. Added an ioctl (PIPEIOC_POLICY) to control the buffer policy. Default (0) is the legacy behavior; Unix domain datagram logic sets the alternative policy so that the packet data persists after the FIFO is closed.	2015-01-30 11:14:24 -06:00
Gregory Nutt	b437cadc03	Minor fixes after initial tests with apps/examples/udgram	2015-01-28 15:27:54 -06:00
Gregory Nutt	e6f43d2ed8	apps/examples/udgram: Improve some size tests and improve error reporting	2015-01-28 14:58:22 -06:00
Gregory Nutt	f429f54aa2	apps/examples/udgram: Add a simple test of Unix domain datagram sockets	2015-01-28 14:28:11 -06:00