Embedded FreeBSD cookbook by Paul Cevoli

By Paul Cevoli

A whole waste of money and time. This ebook 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, restricting reminiscence utilization, equipment motive force improvement, and flash garage matters - simply because those are the themes which are the main relevent to an embedded approach. The dialogue approximately utilizing Tomcat, JSP, and JNI to supply net entry to an embedded equipment - whereas very important - is critically lacking.

A sturdy booklet approximately an embedded working process will discover the issues and trade-offs platforms developer must make. it should additionally speak about getting the OS to run on a unmarried board computing device - equivalent to one of many devboards indexed within the FreeBSD ARM undertaking. This publication does neither.

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NULL) { if (strncmp(userp, cmdptr->command, strlen(cmdptr->command)) == 0) { cmdptr->functionptr(syscall_num, userp); } cmdptr++; } } /* since quit handles cleanup and exit we’ll never get here */ return(err); } Listing 3-18 47 Chapter Three System Calls After initialization, the main program enters an endless loop, processing commands and calling the command handler functions. The program is ter­ minated when the user enters the quit command. Then the quit command handler cleans up and exits.

Before a sys­ tem call is made, the system call number is pushed onto the program stack. 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.

The details of creating a daemon process have been presented and encapsulated into a general purpose function, init_daemon. We’ll revisit the discussion of daemon processes again in Chapter 6, when we implement a daemon to handle DIO queries using sockets. Next, let’s jump into the implementation of FreeBSD system calls. 3 CHAPTER THREE 27 System Calls Overview As mentioned in the previous chapter, the FreeBSD kernel provides an exe­ cution environment for a process called User Mode. A process executing in User Mode cannot directly access kernel memory, kernel data structures or hardware.

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