U

UDP (User Datagram Protocol)

datagram sockets, 744-745 overview of, 785-787 UID (user identification), 47-48

UMA (uniform memory access)

buddy system and, 215 machine options for memory management, 134-136

node and zone initialization, 163-169 overview of, 136-138 prerequisites for initialization of memory and, 162

UML (User-Mode Linux), 1173-1174 uname system, 47 unbindable mounts, 559 unbounded priority inversion, 363 uniform memory access. See UMA (uniform memory access) units of measurements, conventions for, 7

Universal Serial Bus. See USB (Universal

Serial Bus) Unix processes, 4-7

fork and exec mechanisms, 6 init program, 4-6 namespaces, 7 threads, 6-7 Unix Timesharing System (UTS) namespace overview of, 52-53 running kernel an, 50 unresolved references, modules, 475-476 USB (Universal Serial Bus) driver management, 466-468 expansion buses, 392 features and mode of operation,

463-466 hotplugging and, 509-510 overview of, 393, 463 representation of device tree, 468-471 User Datagram Protocol (UDP) datagram sockets, 744-745 overview of, 785-787 user identification (UID), 47-48 user mode preemptive multitasking and, 40-41 privilege levels and, 8-10

switching between user and kernel mode, 833

system call return values and, 835-837 user namespace, 53-54 userland defined, 11

virtual address space, 289 User-Mode Linux (UML), 1173-1174 userspace copying data between kernel and, 344-345 correcting userspace page faults, 336-337 data type access to, 27 defined, 11

divisions of virtual address space, 7-8 initialization, 1238-1239 semaphores. See semaphores, System V system calls accessing, 837-838 UTS (Unix Timesharing System) namespace overview of, 52-53 running kernel an, 50

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