By W. Richard Stevens, Stephen A. Rago

ISBN-10: 0321637739

ISBN-13: 9780321637734

For greater than 20 years, critical C programmers have depended on one ebook for functional, in-depth wisdom of the programming interfaces that force the UNIX and Linux kernels: W. Richard Stevens’ Advanced Programming within the UNIX® Environment . Now, once more, Rich’s colleague Steve Rago has completely up-to-date this vintage paintings. the recent 3rd variation helps today’s major systems, displays new technical advances and top practices, and aligns with model four of the only UNIX Specification.

Steve rigorously keeps the spirit and strategy that experience made this publication so useful. development on Rich’s pioneering paintings, he starts off with records, directories, and strategies, rigorously laying the foundation for extra complicated strategies, corresponding to sign dealing with and terminal I/O. He additionally completely covers threads and multithreaded programming, and socket-based IPC.

This version covers greater than seventy new interfaces, together with POSIX asynchronous I/O, spin locks, limitations, and POSIX semaphores. so much out of date interfaces were got rid of, with the exception of a number of which are ubiquitous. approximately all examples were verified on 4 sleek systems: Solaris 10, Mac OS X model 10.6.8 (Darwin 10.8.0), FreeBSD 8.0, and Ubuntu model 12.04 (based on Linux 3.2).

As in past variants, you’ll research via examples, together with greater than 10000 traces of downloadable, ISO C resource code. greater than 400 approach calls and capabilities are proven with concise, whole courses that essentially illustrate their utilization, arguments, and go back values. To tie jointly what you’ve realized, the ebook provides a number of chapter-length case reviews, each one reflecting modern environments.

Advanced Programming within the UNIX® setting has helped generations of programmers write code with extraordinary energy, functionality, and reliability. Now up-to-date for today’s platforms, this 3rd variation can be much more helpful.

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Extra resources for Advanced Programming in the UNIX Environment (3rd Edition) (Addison-Wesley Professional Computing Series)

Sample text

The sum of user CPU time and system CPU time is often called the CPU time. It is easy to measure the clock time, user time, and system time of any process: simply execute the time(1) command, with the argument to the time command being the command we want to measure. 07s The output format from the time command depends on the shell being used, because some shells don’t run /usr/bin/time, but instead have a separate built-in function to measure the time it takes commands to run. 17, we’ll see how to obtain these three times from a running process.

Here, cc is usually linked to gcc. out /dev . out /dev/tty can’t open /dev/tty: Not a directory Throughout this text, we’ll show commands that we run and the resulting output in this fashion: Characters that we type are shown in this font, whereas output from programs is shown like this. 4 Files and Directories 7 the comments in italics. The dollar sign that precedes our input is the prompt that is printed by the shell. We’ll always show the shell prompt as a dollar sign. Note that the directory listing is not in alphabetical order.

If we don’t like its operation, we can define our own malloc function, which will probably use the sbrk system call. In fact, numerous software packages implement their own memory allocation algorithms with the sbrk system call. 11 shows the relationship between the application, the malloc function, and the sbrk system call. 11 Separation of malloc function and sbrk system call Here we have a clean separation of duties: the system call in the kernel allocates an additional chunk of space on behalf of the process.

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