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In computer science, a synthetic file system or a pseudo file system is a hierarchical interface to non-file objects that appear as if they were regular files in the tree of a disk-based or long-term-storage file system. These non-file objects may be accessed with the same system calls or utility programs as regular files and directories. The ...
Library multi-versioning (LMV): the entire programming library is duplicated for many instruction set extensions, and the operating system or the program decides which one to load at run-time. FMV, manually coded in assembly language, is quite commonly used in a number of performance-critical libraries such as glibc and libjpeg-turbo.
Some of the metadata is maintained by the file system, for example last-modification date (and various other dates depending on the file system), location of the beginning of the file, the size of the file and if the file system backup utility has saved the current version of the files. These items cannot usually be altered by a user program.
The arrays are heterogeneous: a single array can have keys of different types. PHP's associative arrays can be used to represent trees, lists, stacks, queues, and other common data structures not built into PHP. An associative array can be declared using the following syntax:
Michigan Terminal System (MTS) – provides "line files" where record lengths and line numbers are associated as metadata with each record in the file, lines can be added, replaced, updated with the same or different length records, and deleted anywhere in the file without the need to read and rewrite the entire file.
Following Lisp, other high-level programming languages which feature linked lists as primitive data structures have adopted an append. To append lists, as an operator, Haskell uses ++, OCaml uses @. Other languages use the + or ++ symbols to nondestructively concatenate a string, list, or array.
O_APPEND data written will be appended to the end of the file. The file operations will always adjust the position pointer to the end of the file. O_CREAT Create the file if it does not exist; otherwise the open fails setting errno to ENOENT. O_EXCL Used with O_CREAT if the file already exists, then fail, setting errno to EEXIST.
Operating system File system; 1968: George 3: George 3: 1971: OS/8: DECtape / OS/8 1972: RSX-11: ODS-1: 1974: CP/M: CP/M file system: 1980: 86-DOS: FAT12, but logically format incompatible with MS-DOS/PC DOS. 1981: PC DOS 1.0: FAT12: 1982: MS-DOS 1.25: FAT12: 1982: Commodore 64 / 1541: Commodore DOS (CBM DOS) 1984: PC DOS 3.0 / MS-DOS 3.0 ...