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

By Robert Love

Write software program that attracts at once on providers provided by way of the Linux kernel and middle procedure libraries. With this accomplished ebook, Linux kernel contributor Robert Love offers you an instructional on Linux process programming, a reference guide on Linux method calls, and an insider’s consultant to writing smarter, quicker code.

Love basically distinguishes among POSIX typical features and specific companies provided purely by means of Linux. With a brand new bankruptcy on multithreading, this up to date and elevated version offers an in-depth examine Linux from either a theoretical and utilized viewpoint over quite a lot of programming themes, including:

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

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Extra resources for Linux System Programming: Talking Directly to the Kernel and C Library

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The newest model of Solaris not helps this functionality. you can use the standards-compliant atexit( ) as an alternative. 138 | bankruptcy five: strategy administration SIGCHLD while a strategy terminates, the kernel sends the sign SIGCHLD to the guardian. through default, this sign is missed, and no motion is taken through the mother or father. strategies can opt for to address this sign, even though, through the sign( ) or sigaction( ) procedure calls. those calls, and the remainder of the fantastic global of indications, are coated in bankruptcy nine. The SIGCHLD sign will be generated and dispatched at any time, as a child’s termination is asynchronous with admire to its mother or father. yet usually, the mum or dad desires to research extra approximately its child’s termination, or perhaps explicitly look ahead to the event’s incidence. this can be attainable with the procedure calls mentioned subsequent. awaiting Terminated baby strategies Receiving notification through a sign is good, yet many fogeys are looking to receive additional info while considered one of their baby strategies terminates—for instance, the child’s go back price. If a baby technique have been to completely disappear whilst terminated, as one may well count on, no remnants could stay for the mother or father to enquire. for this reason, the unique designers of Unix made up our minds that once a toddler dies ahead of its mother or father, the kernel should still positioned the kid right into a precise method country. A strategy during this kingdom is really a zombie. just a minimum skeleton of what used to be the process—some easy kernel info constructions containing very likely beneficial data—is retained. A approach during this country waits for its father or mother to inquire approximately its prestige (a technique often called ready at the zombie process). purely after the guardian obtains the knowledge preserved concerning the terminated baby does the method officially go out and stop to exist while a zombie. The Linux kernel presents numerous interfaces for acquiring information regarding terminated childrens. the best such interface, outlined through POSIX, is wait( ): #include #include pid_t wait (int *status); a decision to attend( ) returns the pid of a terminated baby, or -1 on blunders. If no baby has terminated, the decision blocks till a toddler terminates. If a toddler has already terminated, the decision returns instantly. therefore, a choice to attend( ) in line with information of a child’s demise—say, upon receipt of a SIGCHLD—will consistently go back with no blockading. On errors, there are attainable errno values: ECHILD The calling approach doesn't have any youngsters. EINTR A sign used to be bought whereas ready, and the decision back early. anticipating Terminated baby approaches | 139 If no longer NULL, the prestige pointer includes more information concerning the baby. simply because POSIX permits implementations to outline the bits in prestige as they see healthy, the normal presents a family members of macros for analyzing the parameter: #include int int int int WIFEXITED (status); WIFSIGNALED (status); WIFSTOPPED (status); WIFCONTINUED (status); int int int int WEXITSTATUS (status); WTERMSIG (status); WSTOPSIG (status); WCOREDUMP (status); both of the 1st macros might go back actual (a nonzero value), looking on how the method terminated.

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