By Paul Cevoli
ISBN-10: 1589950046
ISBN-13: 9781589950047
A whole waste of money and time. This e-book is misrepresented in what it claims to be approximately. It comprises little or no details particular to embedded FreeBSD.
The writer must have written even more approximately minimizing the kernel, proscribing reminiscence utilization, gadget driving force improvement, and flash garage matters - simply because those are the themes which are the main relevent to an embedded method. The dialogue approximately utilizing Tomcat, JSP, and JNI to supply internet entry to an embedded machine - whereas very important - is critically lacking.
A solid e-book approximately an embedded working process will discover the issues and trade-offs structures developer should make. it'll additionally talk about getting the OS to run on a unmarried board computing device - equivalent to one of many devboards indexed within the FreeBSD ARM venture. This booklet does neither.
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Additional resources for Embedded FreeBSD Cookbook (Embedded Technology)
Sample text
0) { printf(“syscall failed\n”); } } Listing 3-15 44 Embedded FreeBSD Cookbook After parsing the write parameters, the write command accepts additional input from the user, the data to write to the location. Once the data is input, the write handler calls the copymem system call to write the kernel memory. Quit Handler The quit handler is used to clean up and exit the program. The quit com mand handler does not use the input parameters; they are ignored. void quit_handler(int num, char* args) { /* ** since this is the program exit we must free the user ** buffer malloced in the main program */ free(args); exit(0); } Listing 3-16 The quit handler frees the user buffer used for commands, then exits the program normally.
Because copymem is a user-defined system call, the call is made using the syscall function. Write Handler The write command is used to write kernel memory. The write command takes two parameters, the kernel address and a length. The maximum size of a write is 4096 bytes defined by the BUFFER_MAX macro. This maximum is an arbitrary value. = 0) { printf(“syscall failed\n”); } } Listing 3-15 44 Embedded FreeBSD Cookbook After parsing the write parameters, the write command accepts additional input from the user, the data to write to the location.
The Device Switch Table The device switch table consists of a set of routines that comprise the upper and lower halves of the device driver. The upper half provides the system call implementation for the device driver such as read, write, open, ioctl and close. Upper half functions execute synchronously with a user process and are preemptable, permitted to block. The lower half routines interface with the device registers and implement the hardware interrupt service routine. Lower half routines are not preemptable and cannot block.