By Paul Cevoli
ISBN-10: 1589950046
ISBN-13: 9781589950047
A whole waste of time and cash. This booklet 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, gadget driving force improvement, and flash garage matters - simply because those are the subjects which are the main relevent to an embedded procedure. The dialogue approximately utilizing Tomcat, JSP, and JNI to supply net entry to an embedded gadget - whereas very important - is significantly lacking.
A strong ebook approximately an embedded working process will discover the issues and trade-offs platforms developer must make. it'll additionally talk about getting the OS to run on a unmarried board desktop - reminiscent of one of many devboards indexed within the FreeBSD ARM venture. This e-book does neither.
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Additional resources for Embedded FreeBSD Cookbook (Embedded Technology)
Sample text
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.
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.
Each entry in the command table links the ASCII command with its command handler and help string. Adding a new command is straightforward. Declare the command handler and add the ASCCI string, command handler, and help string to the com mand table. After adding the entry to the command table, implement the command handler. The dumpmem Function The dumpmem function, contained in Listing 3-14, is a utility function that dumps memory in hexadecimal and ASCII character format. Dumpmem is called by the read_handler function to display the request kernel memory.
Embedded FreeBSD Cookbook (Embedded Technology) by Paul Cevoli
by Robert
4.3