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Full Discussion: NFS4 locking file question
Top Forums UNIX for Advanced & Expert Users NFS4 locking file question Post 302518188 by markdjones82 on Thursday 28th of April 2011 09:39:55 PM
Old 04-28-2011
NFS4 locking file question

All,
Just wondering if someone has a file open on client A for writing and it is locked, is that file still readable from client A or B?

Basically I'm just wanting to know if a file is opened already, can it still be opened for read only?
 

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FIFO(4) 						     Linux Programmer's Manual							   FIFO(4)

NAME
fifo - first-in first-out special file, named pipe DESCRIPTION
A FIFO special file (a named pipe) is similar to a pipe, except that it is accessed as part of the file system. It can be opened by multi- ple processes for reading or writing. When processes are exchanging data via the FIFO, the kernel passes all data internally without writ- ing it to the file system. Thus, the FIFO special file has no contents on the file system, the file system entry merely serves as a refer- ence point so that processes can access the pipe using a name in the file system. The kernel maintains exactly one pipe object for each FIFO special file that is opened by at least one process. The FIFO must be opened on both ends (reading and writing) before data can be passed. Normally, opening the FIFO blocks until the other end is opened also. A process can open a FIFO in non-blocking mode. In this case, opening for read only will succeed even if noone has opened on the write side yet; opening for write only will fail with ENXIO (no such device or address) unless the other end has already been opened. Under Linux, opening a FIFO for read and write will succeed both in blocking and non-blocking mode. POSIX leaves this behaviour undefined. This can be used to open a FIFO for writing while there are no readers available. A process that uses both ends of the connection in order to communicate with itself should be very careful to avoid deadlocks. NOTES
When a process tries to write to a FIFO that is not opened for read on the other side, the process is sent a SIGPIPE signal. FIFO special files can be created by mkfifo(3), and are specially indicated in ls -l. SEE ALSO
mkfifo(3), mkfifo(1), pipe(2), socketpair(2), open(2), signal(2), sigaction(2) Linux Man Page 1999-06-20 FIFO(4)
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