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5.4 Relationship Between File Descriptors and Open Files

4BSD provides the flock system call, which only supports advisory locking of open files, but allows both shared and exclusive locks

A process may pass a file descriptor to another unrelated process

The interface for descriptor passing depends on the UNIX variant...4.3 BSD uses sendmsg and recvmsg calls to a socket connection.

Sometimes, after lookup completes, the kernel might decide not to proceed with the creation or deletion (perhaps because the caller does not have adequate

permissions). In that case, it mustinvoke an abortop operation to release the lock on the parent directory.

Following the superblock is the node list...

When a process first writes to a page that is mapped MAP_PRIVATE either to a file or to the anonymous object. This includes dirty pages of text, data, stack, and other explicitly created private mappings.

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