How to resolve the algorithm Show the epoch step by step in the Limbo programming language

Published on 12 May 2024 09:40 PM
#Limbo

How to resolve the algorithm Show the epoch step by step in the Limbo programming language

Table of Contents

Problem Statement

Choose popular date libraries used by your language and show the   epoch   those libraries use. A demonstration is preferable   (e.g. setting the internal representation of the date to 0 ms/ns/etc.,   or another way that will still show the epoch even if it is changed behind the scenes by the implementers),   but text from (with links to) documentation is also acceptable where a demonstration is impossible/impractical. For consistency's sake, show the date in UTC time where possible.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Show the epoch step by step in the Limbo programming language

Source code in the limbo programming language

implement Epoch;

include "sys.m"; sys: Sys;
include "draw.m";
include "daytime.m"; daytime: Daytime;
	Tm: import daytime;

Epoch: module {
	init: fn(nil: ref Draw->Context, nil: list of string);
};

init(nil: ref Draw->Context, nil: list of string)
{
	sys = load Sys Sys->PATH;
	daytime = load Daytime Daytime->PATH;
	sys->print("%s\n", daytime->text(daytime->gmt(0)));
}


implement Epoch;

include "sys.m"; sys: Sys;
include "draw.m";
include "daytime.m"; daytime: Daytime;
	Tm: import daytime;

Epoch: module {
	init: fn(nil: ref Draw->Context, nil: list of string);
};

init(nil: ref Draw->Context, nil: list of string)
{
	sys = load Sys Sys->PATH;
	daytime = load Daytime Daytime->PATH;

	# Create a file containing a zero:
	fd := sys->open("/tmp/0", Sys->OWRITE);
	if(fd == nil) {
		sys->fprint(sys->fildes(2), "Couldn't open /tmp/0 for writing: %r\n");
		raise "fail:errors";
	}
	sys->fprint(fd, "0");
	fd = nil; # Files with no references are closed immediately.

	# Fork the namespace so as not to disturb the parent
	# process's concept of time:
	sys->pctl(Sys->FORKNS, nil);
	# Bind that file over /dev/time:
	sys->bind("/tmp/0", "/dev/time", Sys->MREPL);
	
	# Print the "current" date, now the epoch:
	sys->print("%s\n", daytime->text(daytime->gmt(daytime->now())));
}

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