Download UNIX network programming, vol.2: Interprocess communication by W. Richard Stevens PDF

By W. Richard Stevens

Well-implemented interprocess communications (IPC) are key to the functionality of just about each non-trivial UNIX software. In UNIX community Programming, quantity 2, moment variation, mythical UNIX specialist W. Richard Stevens offers a complete advisor to each kind of IPC, together with message passing, synchronization, shared reminiscence, and distant strategy Calls (RPC). Stevens starts with a easy creation to IPC and the issues it truly is meant to resolve. step by step you will the way to maximize either process V IPC and the hot Posix criteria, which provide dramatic advancements in comfort and function.

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This deletion should not be done blindly. If the directory contains any qf files, the Internet mail standards require that a "bounce message," a special type of Delivery Status Notification (DSN), be returned for each undelivered message. If an old directory that is not being accessed by any sendmail processes which may receive new messages to handle has no qf files in it, then it can be safely deleted. *, and qf files remain after the process completes its queue run, then something that shouldn't happen has happened and a person should investigate.

Besides space, deep queues can cause another, often overlooked problem. As more entries are added to a directory, the filesystem will obviously need to allocate more space to that directory to hold the information on all of its files. Afterward, even if the number of directory entries returns to a manageable size, the space allocated to the directory itself does not contract. The blank records that used to contain file information must still be scanned as a process walks through the directory looking for files.

The ext3fs filesystem supports three types of journaling modes, two of which are potentially useful for email delivery. The first, data=ordered, is the default configuration for ext3fs. Using this method, filesystem metadata are journaled, but updates to file contents go directly to disk. In the second configuration, data= journal, both filesystem updates and metadata are written to the journal before being written to disk. Under most workloads, filesystem performance using data=ordered will be superior to that with data=journal because file contents are written twice rather than once in the latter case.

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