On 3 February 2014, LCD 47 <[email protected]> wrote:
> On 3 February 2014, ZyX <[email protected]> wrote:
> > > IIRC, SysV had putenv(3), while BSD had setenv(3). The latter
> > > had a corresponding unsetenv(3), while the former didn't.
> > >
> > > > On my Ubuntu Linux system, the unsetenv(3) man page says that it
> > > > conforms to 4.3BSD and POSIX.1-2001.
> > >
> > > POSIX? As Wietse Venema used to put it, you're young and
> > > impatient. ;)
> >
> > You mean SysV does not have C function for unsetting environment?
> [...]
>
> Well, historically yes. OSF/1 2.0 (some 20+ years ago) didn't
> have any way to unset environment, then OSF/1 3.2 had unsetenv(3), but
> it wasn't declared by default, or something like that. Sadly I don't
> remember anything about Solaris.
A quick search reveals this:
http://www.greenend.org.uk/rjk/tech/putenv.html
According to this guy unsetenv() was added in Solaris 5.10, which is
now ~10 years old. On Solaris you could modify *environment directly,
but IIRC on OSF/1 that was explicitly forbidden.
/lcd
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