By Warren W Gay
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 ebook builds at the talents and data the reader already possesses. It contains assurance of net methods, interprocess regulate, dossier procedure manipulation, synchronization, and masses extra.
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Additional resources for Advanced UNIX Programming (Sams White Book Series)
Special Files While you may not have realized it, you already know about special files. These are file system objects that allow access to devices. Here are some of the examples that you have seen already: Terminal device Mouse Block disk device Character disk device /dev/tty /dev/sysmouse /dev/wd0s2a /dev/rwd0s2a These are special files because they represent only the actual device in question (FreeBSD see intro(4)). It is only by convention that you tend to find these devices in the /dev directory.
The read(2) and write(2) calls are serviced by the UNIX kernel, shown at the bottom of the figure. 1 The I/O software layers. An example of a shortcoming of the stdio(3) routines is that they behave differently on different platforms. On some UNIX platforms, the error EINTR is returned when a signal handler returns, while on others this error is not returned at all. On still other UNIX platforms, the stdio(3) routines get confused dealing with EINTR and do not work correctly. Sometimes you can live with the stdio(3) interface, but you'll want to perform a special control function on the open FILE.
This allows the file system to be subdivided into logical groups of files and other file system objects. 4-Release contained all of its 60,014 (or more) files under the root directory? Early releases of UNIX permitted directories to be read and written like regular files. Over time, several problems with this open concept emerged: • • • Program errors or accidental writes to a directory could cause the loss of several files. New file systems supported different directory structure entries. Long filename support made it inconvenient to work directly with directory entries.
Advanced UNIX Programming (Sams White Book Series) by Warren W Gay