Download PDF by Warren W Gay: Advanced UNIX Programming (Sams White Book Series)

By Warren W Gay

ISBN-10: 067231990X

ISBN-13: 9780672319907

ISBN-10: 0768657148

ISBN-13: 9780768657142

Complicated UNIX Programming is going past the basics of UNIX programming and offers info and strategies the readers must extend their wisdom base. Designed for pro UNIX programmers, this e-book builds at the abilities and data the reader already possesses. It contains insurance of net procedures, interprocess keep watch over, dossier method manipulation, synchronization, and lots more and plenty extra.

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The sticky bit in this way permits only the user's own files in a given directory to be tampered with. The sticky bit enables you to create a directory in which other users can create files of their own, but they cannot remove other users'files. Additionally, you can create readonly files for those users without worrying about those read-only files being renamed or deleted. Working with Files Under UNIX A file or device under UNIX is opened with the open(2) system call. Before open(2) is considered in detail, let's first examine the way UNIX references open files in general.

The mouse attached to the console is another example (FreeBSD): $ ls -l /dev/sysmouse crw------- 1 root wheel $ 12, 128 Feb 19 11:05 /dev/sysmouse Here again, you can see that the mouse is considered a character device. Disks are also accessible using UNIX character devices. The same disks can be accessed using the corresponding block device that you read about earlier. However, character raw devices (for disks) are often provided to the database engines. Database engines manage the performance of disk I/O better than the block device cache because of their intimate knowledge of the data structures being used by the database.

However, if you already know the name of a file under that directory and you have execute access on the directory, then you can open that file (assuming the file grants read access). You can also change to a subdirectory of a directory with execute-only access, if you already know the subdirectory's name (if the named subdirectory itself permits it with execute permission). A subdirectory without execute permission will not permit you to change to that directory, nor will it permit you to open files within it.

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Advanced UNIX Programming (Sams White Book Series) by Warren W Gay


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