Download E-books Linux System Programming: Talking Directly to the Kernel and C Library PDF

By Robert Love

Write software program that pulls without delay on prone provided by means of the Linux kernel and middle procedure libraries. With this finished publication, Linux kernel contributor Robert Love provide you with an academic on Linux process programming, a reference handbook on Linux procedure calls, and an insider’s consultant to writing smarter, swifter code.

Love sincerely distinguishes among POSIX average capabilities and specified providers provided in simple terms through Linux. With a brand new bankruptcy on multithreading, this up to date and multiplied version presents an in-depth examine Linux from either a theoretical and utilized viewpoint over a variety of programming issues, including:

  • A Linux kernel, C library, and C compiler overview
  • Basic I/O operations, equivalent to analyzing from and writing to files
  • Advanced I/O interfaces, reminiscence mappings, and optimization techniques
  • The kin of method demands simple strategy management
  • Advanced method administration, together with real-time processes
  • Thread techniques, multithreaded programming, and Pthreads
  • File and listing management
  • Interfaces for allocating reminiscence and optimizing reminiscence access
  • Basic and complicated sign interfaces, and their function at the system
  • Clock administration, together with POSIX clocks and high-resolution timers

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243 the method handle area Allocating Dynamic reminiscence dealing with the information phase nameless reminiscence Mappings complicated reminiscence Allocation Debugging reminiscence Allocations Stack-Based Allocations making a choice on a reminiscence Allocation Mechanism Manipulating reminiscence Locking reminiscence Opportunistic Allocation 243 245 255 256 260 263 264 268 269 273 277 nine. signs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279 sign suggestions easy sign administration Sending a sign Reentrancy sign units blocking off indications 280 286 291 293 295 296 desk of Contents | vii Advanced sign administration Sending a sign with a Payload end 298 305 306 10. Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308 Time’s facts buildings POSIX Clocks Getting the present Time of Day atmosphere the present Time of Day twiddling with Time Tuning the process Clock dozing and ready Timers 310 313 315 318 320 321 324 330 Appendix. GCC Extensions to the c program languageperiod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 339 Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 355 viii | desk of Contents Foreword there's an outdated line that Linux kernel builders wish to throw out after they are feeling grumpy: “User area is simply a attempt load for the kernel. ” via muttering this line, the kernel builders objective to scrub their fingers of all accountability for any failure to run user-space code in addition to attainable. so far as they’re involved, user-space builders may still simply depart and fasten their very own code, as any difficulties are certainly now not the kernel’s fault. To end up that it is usually now not the kernel that's at fault, one major Linux kernel developer has been giving a “Why person area Sucks” check with packed convention rooms for greater than 3 years now, stating actual examples of terrible userspace code that everybody will depend on each day. different kernel builders have created instruments that express how badly user-space courses are abusing the and draining the batteries of unsuspecting laptops. yet whereas user-space code should be only a “test load” for kernel builders to scoff at, it seems that each one of those kernel builders additionally rely on that user-space code each day. If it weren’t current, all of the kernel will be stable for will be to print out alternating ABABAB styles at the display. right away, Linux is the main versatile and strong working method that has ever been created, operating every thing from the tiniest cellphones and embedded units to greater than 70 percentage of the world’s best 500 supercomputers. No different working method has ever been in a position to scale so good and meet the demanding situations of all of those varied forms and environments. And in addition to the kernel, code working in consumer house on Linux may also function on all of these systems, offering the realm with actual functions and utilities humans depend on. during this booklet, Robert Love has taken at the unenviable job of training the reader approximately virtually each method name on a Linux process.

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