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  2. Universally unique identifier - Wikipedia

    en.wikipedia.org/wiki/Universally_unique_identifier

    Thus, for variant 1 (that is, most UUIDs) a random version 4 UUID will have 6 predetermined variant and version bits, leaving 122 bits for the randomly generated part, for a total of 2 122, or 5.3 × 10 36 (5.3 undecillion) possible version-4 variant-1 UUIDs. There are half as many possible version 4, variant 2 UUIDs (legacy GUIDs) because ...

  3. Primitive data type - Wikipedia

    en.wikipedia.org/wiki/Primitive_data_type

    1 byte 8 bits Byte, octet, minimum size of char in C99( see limits.h CHAR_BIT) −128 to +127 0 to 255 2 bytes 16 bits x86 word, minimum size of short and int in C −32,768 to +32,767 0 to 65,535 4 bytes 32 bits x86 double word, minimum size of long in C, actual size of int for most modern C compilers, [8] pointer for IA-32-compatible processors

  4. 128-bit computing - Wikipedia

    en.wikipedia.org/wiki/128-bit_computing

    Universally unique identifiers (UUID) consist of a 128-bit value. IPv6 routes computer network traffic amongst a 128-bit range of addresses. ZFS is a 128-bit file system. 128 bits is a common key size for symmetric ciphers and a common block size for block ciphers in cryptography. The IBM i Machine Interface defines all pointers as 128-bit. The ...

  5. User identifier - Wikipedia

    en.wikipedia.org/wiki/User_identifier

    The effective UID (euid) of a process is used for most access checks.It is also used as the owner for files created by that process. The effective GID (egid) of a process also affects access control and may also affect file creation, depending on the semantics of the specific kernel implementation in use and possibly the mount options used.

  6. Orders of magnitude (data) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(data)

    1 bit – 0 or 1, false or true, Low or High (a.k.a. unibit) 1.442695 bits (log 2 e) – approximate size of a nat (a unit of information based on natural logarithms) 1.5849625 bits (log 2 3) – approximate size of a trit (a base-3 digit) 2 1: 2 bits – a crumb (a.k.a. dibit) enough to uniquely identify one base pair of DNA

  7. U-form - Wikipedia

    en.wikipedia.org/wiki/U-form

    In computer science, a U-form is an abstract data type comprising a collection of attribute–value pairs associated with a universally-unique identifier (UUID).A U-form essentially comprises an associative array augmented with a UUID and with keys limited to strings.

  8. Mach-O - Wikipedia

    en.wikipedia.org/wiki/Mach-O

    The section alignment is the logarithm, base 2, of the byte alignment in the file required for the Mach-O image to which the entry refers; for example, a value of 14 means that the image must be aligned on a 2 14-byte boundary, i.e. a 16384-byte boundary. This is required by tools that modify the multi-architecture binary, in order for them to ...

  9. x86 calling conventions - Wikipedia

    en.wikipedia.org/wiki/X86_calling_conventions

    Stack aligned on 16 bytes. 32 bytes shadow space on stack. The specified 8 registers can only be used for parameters 1 through 4. For C++ classes, the hidden this parameter is the first parameter, and is passed in RCX. [31] vectorcall: Windows (Microsoft Visual C++, Clang, ICC) RCX/[XY]MM0, RDX/[XY]MM1, R8/[XY]MM2, R9/[XY]MM3 + [XY]MM4–5: RTL ...