Download e-book for iPad: Embedded FreeBSD Cookbook (Embedded Technology) by Paul Cevoli

By Paul Cevoli

ISBN-10: 1589950046

ISBN-13: 9781589950047

An entire waste of money and time. This e-book is misrepresented in what it claims to be approximately. It includes little or no details particular to embedded FreeBSD.

The writer must have written even more approximately minimizing the kernel, proscribing reminiscence utilization, equipment motive force improvement, and flash garage matters - simply because those are the themes which are the main relevent to an embedded process. The dialogue approximately utilizing Tomcat, JSP, and JNI to supply internet entry to an embedded equipment - whereas vital - is critically lacking.

A strong publication approximately an embedded working process will discover the issues and trade-offs structures developer must make. it can additionally speak about getting the OS to run on a unmarried board computing device - resembling one of many devboards indexed within the FreeBSD ARM venture. This ebook does neither.

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Sample text

Help Handler The help command handler is used to display help text strings. The help command handler does not use the input parameters; they are ignored. = NULL) { printf(“\t%s\n”, cmdptr->helpstring); cmdptr++; } } Listing 3-17 45 Chapter Three System Calls Every command entry contains a help text string. The help command handler iterates through all the commands and displays each command help string. The main Program The copymem program handles initialization and command parsing. Since the copymem system call is a KLD and the system call number is dynamically assigned, the system call number must be determined by querying the kernel module subsystem.

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. Signals Signals are mechanisms to notify a process that a system event has occurred.

30 Embedded FreeBSD Cookbook In addition to the system call number, many system calls take parameters. Parameters are passed to the kernel using the C calling con­ vention. The caller pushes the system call parameters on the stack, one after another, in reverse order, right to left, so that the first argument specified to the function is pushed last. On return from the system call, the caller restores the stack to its original value before the call; this is called popping the stack. arg # n • • • arg 1 system call number Figure 3-4.

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Embedded FreeBSD Cookbook (Embedded Technology) by Paul Cevoli

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