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From: John Levine <johnl@taugh.com>
Newsgroups: comp.arch
Subject: Re: C and turtles, 80286 protected mode
Date: Wed, 16 Oct 2024 03:09:59 -0000 (UTC)
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According to MitchAlsup1 <mitchalsup@aol.com>:
>> It's easy enough to write malloc() in standard C if your flavor of the
>> standard includes a way to ask the operating system for heap space.
>> Back in the old days it was sbrk().  Now it's mmap(MAP_ANON).
>>
>> But I would be quite surprised if either of those ever made it into
>> any version of standard C.
>
>sbrk() was in the std. library on PDP-11/70 that I used 1982.

It was in the library on the PDP-11/45 I used in 1976, too, but
the C library was whatever was in the C library, a mix of Unix
system calls and other stuff.  The first C standard wasn't
published until 1985.

In 1976 I also wrote C code that ran on an 11/05 that controlled some
early bitmap terminals. It didn't have sbrk() becasue there wasn't an
operating system underneath.
-- 
Regards,
John Levine, johnl@taugh.com, Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail. https://jl.ly