Read e-book online Embedded FreeBSD cookbook PDF

By Paul Cevoli

ISBN-10: 0080491227

ISBN-13: 9780080491226

ISBN-10: 1281007277

ISBN-13: 9781281007278

The FreeBSD working procedure has turn into a favored OS selection for embedded structures as a result of its small dimension and the truth that it really is loose to clients. besides the fact that, unique info on utilizing FreeBSD is hard to discover. writer Paul Cevoli, an skilled embedded structures engineer, solutions that desire during this cookbook aimed toward making lifestyles more uncomplicated for engineers operating with FreeBSD. subject matters coated within the publication contain center working method parts, techniques, procedure scheduling, digital reminiscence, equipment drivers and debugging, as those are the center good points helpful for embedded method builders. each one bankruptcy discusses uncomplicated parts of FreeBSD, gadget drivers, Unix kernel, and C and GNU improvement instruments, and offers the reader with the knowledge had to accomplish the acknowledged job, in addition to pattern resource code.

  • Provides a number of examples of process software program with resource code and debugging thoughts which may supply beginning issues in your personal designs
  • Covers center working process elements, approaches and strategy scheduling, method booting, digital reminiscence, equipment drivers, debugging, and lots more and plenty extra

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20 Embedded FreeBSD Cookbook State A process is in one of five states at any time. The process state is used internally by the FreeBSD kernel to organize processes. Process states and their definitions are described below. Description SIDL Initial state of a process on creation while waiting for resources to be allocated. SRUN The process is ready to run. SSLEEP The process is suspended waiting for an event. SSTOP The process is being debugged or suspended. SZOMB The process has exited and is waiting to notify its parent.

The fifth and final argument represents a pointer for the user-defined KLD data to the load handler. A Simple Debugger In the previous section we created a new system call that provides a mecha­ nism for a user program to read and write kernel memory. The remainder of this chapter defines a program that implements a simple command parser, giving us a utility for reading and modifying kernel memory. 39 Chapter Three System Calls Command Definitions The copymem utility is command driven. To simplify command parsing, a structure data type is defined, command_t, which contains an ASCII com­ mand string, a function pointer, and a help string.

This allows the parent to continue responding to requests or to perform other tasks. The init_daemon Function The init_daemon function in Listing 2-3 handles the details of making the child process a daemon process as described in this section. void init_daemon() { int childpid int fd struct rlimit = 0; = 0; max_files; /* ** create a child process */ if ((childpid = fork()) < 0) { /* handle the error condition */ exit(-1); } else if (childpid > 0) { /* this is the parent, we may successfully exit */ exit(0); } 24 Embedded FreeBSD Cookbook /* now executing as the child process */ /* become the session leader */ setsid(); /* ** close all open file descriptors, need to get the maximum ** number of open files from getrlimit.

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Embedded FreeBSD cookbook by Paul Cevoli

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