systems:4th_edition
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systems:4th_edition [2023/02/16 08:05] – admin | systems:4th_edition [2023/06/01 06:22] – Extrapolate significant changes segaloco | ||
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This is a tar archive derived from a DECtape labelled " | This is a tar archive derived from a DECtape labelled " | ||
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+ | The Fourth Edition marks the first edition of research UNIX for which the accompanying manual is produced in NROFF rather than ROFF. Many deprecated/ | ||
+ | |||
+ | Among the more noticeable changes are: | ||
+ | |||
+ | * The filesystem has been altered to support 14 character file names (over the previous 8 characters), | ||
+ | * The object file loader has dropped support for V1-style a.out binaries but now supports shared text segments, and associated development tools have been modified to support this as well | ||
+ | * The epoch is redefined in seconds instead of milliseconds and with a reference date of 1/1/1970, starting the modern UNIX epoch | ||
+ | * The signal(II) system call is added to replace individual system calls for redirecting specific exceptions | ||
+ | * The contents of the /sys filesystem have been merged with the /usr filesystem | ||
+ | * Pipes have gained their familiar | syntax (along with ^), replacing the > which could be confused with output redirection | ||
+ | * Block devices now present both buffered and raw interfaces | ||
+ | * The init process now offloads machine-specific startup to /etc/rc rather than requiring modification for different disks and other localisms | ||
+ | |||
+ | Other changes include: | ||
+ | * Alteration of makdir(II) into the mknod(II) syscall | ||
+ | * Removal of the mdate(II) and rele(II) syscalls | ||
+ | * The stty(II) interface has been altered to be less DC-11 specific | ||
+ | * open(II) now supports mode " | ||
+ | * nice(II) allows setting a priority (rather than dropping to a fixed one) | ||
+ | * mount(II) expands mountable filesystem count past 4 | ||
+ | * kill(II) can now be used to send arbitrary signals, not just kill itself | ||
+ | * stat(II) now reports if a file is a block or character special file | ||
+ | |||
+ | * Deprecation of applications targeting the assembly version of UNIX such as tmg(VI) and m6(VI) | ||
+ | * Deprecation of the salloc(III) library | ||
+ | * Removal of any remaining formal B support | ||
+ | * Removed DECish basic(VI) in favor of bas(I) | ||
+ | * New dump(VIII)/ | ||
+ | * chdir(I) now makes mention of needing ' | ||
+ | * Group support added to file modifiers | ||
+ | * cref(I) gains better C support | ||
+ | * date(I) adds support for setting the year | ||
+ | * Core files now include the per-process data at the front, not the back | ||
+ | * login(I) now always prompts for a password as opposed to receiving it as an argument | ||
+ | * The tty driver supports 12 terminals instead of 10 | ||
+ | * the tty driver now discards the entire buffer on overflow instead of printing '#' | ||
+ | * The tty driver maps uppercase to lowercase if only uppercase is used | ||
+ | * The console driver now has greater parity with other tty drivers | ||
+ | * In both above cases, ar(I) is *not* updated to support these | ||
+ | * 2741 terminal support appears to be on the way out | ||
+ | * A new boot procedure is provided for the C UNIX system | ||
+ | |||
+ | * Section I adds catsim, comm, file, grep, merge, nice, nohup, pfe, plot, shift, sleep, tr, troff, wait | ||
+ | * Section II adds intro, getgid, indir, setgid | ||
+ | * Section III adds getarg, getchr, getpw, hmul, ierror, ldiv, nargs, perror, printf, putchr, reset, setfil, vt | ||
+ | * Section IV adds cat, da, tiu, vs | ||
+ | * Section VI adds azel, chess, cubic, maze, sfs, sky, spline, wump | ||
+ | * Section VII adds tmheader | ||
+ | * Section VIII adds ino, mkfs, mknod, sync, update | ||
For more information about Fourth Edition Unix, see [[http:// | For more information about Fourth Edition Unix, see [[http:// | ||
systems/4th_edition.txt · Last modified: 2023/10/18 17:35 by segaloco