Hello ALexander, On Mon, 10 May 2021 at 05:20, Alexander Monakov <amonakov@xxxxxxxxx> wrote: > > > > On Mon, 10 May 2021, Michael Kerrisk (man-pages) via Libc-alpha wrote: > > > Hello, > > > > On Fri, 7 May 2021 at 02:21, Dave Chupreev <cdn.dev@xxxxxxxxx> wrote: > > > > > > Well I see, I've tried on Linux and yea I didn't find any option to insert multiple definitions. > > > > I think the only way to insert multiple definitions is by direct > > manipulation of 'extern char **environ'. > > You can cause a program to start with multiple definitions, because it is > possible to pass arbitrarily funny stuff as 'envp' argument to execve, such as: > > - duplicated entries > - entries without a '=' > - entries starting with '=' > - empty strings > - "2 x 2 = 4" > > All of that will be present in the exec'd program's environment array. Yes. I was too focussed on thinking about what an already running program can do to its current environment. Thanks for reminding me of the above. Thanks, Michael -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/
