Re: streams and file locks, ancient OS history

t appears that Lawrence D'Oliveiro  <ldo@nz.invalid> said:

On Sun, 30 Jun 2024 18:06:36 -0000 (UTC), John Levine wrote:
>

Squinting at the source code for FreeBSD's stdio, it only flushes writes
when it fills the buffer or when it writes a \n character with the '\n'
hard coded in the source code.

>
Both POSIX and C specs require this to be configurable
<https://manpages.debian.org/3/setbuf.3.en.html>.

I looked at more of the code and it seems to do the right thing in
lower level routines. But the point stands, if you want to have
multiple programs writing into the same file, they all need to have
matching locking and buffering.
--
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