By Warren W Gay
Complex UNIX Programming is going past the basics of UNIX programming and offers info and methods the readers must extend their wisdom base. Designed for pro UNIX programmers, this ebook builds at the talents and information the reader already possesses. It comprises insurance of web techniques, interprocess regulate, dossier process manipulation, synchronization, and lots more and plenty extra.
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Extra resources for Advanced UNIX Programming (Sams White Book Series)
Modern UNIX platforms have undergone some changes in order to support threads. While threads are a welcome addition to the UNIX platform, they have required a number of internal changes to the underlying C libraries and the way in which the errno variable is defined. A thread is a separate flow of instructions within one memory environment (all threads share one memory address space). Consequently, the traditional single global integer value of errno no longer suffices, since function calls in one thread would alter the errno values being referenced in another thread.
Again, only when it is determined that the function has returned a failure indication is the value errno valid and does it contain an error code. The New errno Value If you've been a veteran of UNIX C/C++ code for some time, then you've probably noticed some changes in the declaration of the variable errno over the years. Modern UNIX platforms have undergone some changes in order to support threads. While threads are a welcome addition to the UNIX platform, they have required a number of internal changes to the underlying C libraries and the way in which the errno variable is defined.
The second step is important to the operating system in question. UNIX supports a hierarchical file system, which allows directories to contain subdirectories. 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.
Advanced UNIX Programming (Sams White Book Series) by Warren W Gay