Access Controlled: The Shaping of Power, Rights, and Rule in by John Palfrey, Rafal Rohozinski, Jonathan Zittrain, Ronald

By John Palfrey, Rafal Rohozinski, Jonathan Zittrain, Ronald Diebert

Reviews on a brand new iteration of net controls that determine a brand new normative terrain within which surveillance and censorship are regimen.

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The starting address is returned and assigned to the character pointer map in the preceding listing. Length Argument 2 is supplied with the macro BLOCK_SIZE in this example. This is the number of bytes you would like to map into your address space. This was defined earlier in the program as 4 KB: #define BLOCK_SIZE (4∗1024) While the application may not need the full 4 KB of physical memory mapped, mmap(2) may insist on using a multiple of the page size. h> ... long sz = sysconf(_SC_PAGESIZE); Protection The third mmap(2) argument is supplied with the flags PROT_READ and PROT_WRITE.

H is needed for the function prototype and the signal definitions. thread: This is the thread ID that you want to signal (or test). sig: This is the signal that you wish to send. Alternatively, supply zero to test whether the thread exists. returns: Returns zero if the call is successful, or an error code (not in errno). Error Description EINVAL An invalid signal was specified. ESRCH No thread with the ID thread could be found. One useful application of the pthread_kill(3) function is to test whether another thread exists.

The test procedure used is as follows: 1. With raspi-config, configure the desired overclocking profile. 2. Reboot. 3. Change to the book’s source code top-level directory. 4. Use the command make clobber. 5. Use the command time make. Table 7-2 summarizes the results in seconds for compiling all projects for this book, using the different overclocking profiles. The elapsed times did not always improve (Real), but they can vary widely because of how I/O to the SD card occurs. The CPU time otherwise improved, with one small exception between Medium and High “User” CPU time.

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