[Bug libc/15607] Add threadsafe version of getenv()

["jakub at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=15607

--- Comment #2 from Jakub Jelinek <jakub at redhat dot com> ---
It is certainly not straightforward or cleaner, if all the uses of getenv in
glibc are converted to a version that requires locking, there will be a
significant cost to all apps out there, not just one particular that does
something like this.
The current behavior of setenv/putenv is clearly documented.
Why exactly do you want to change environment of the running multi-threaded
process, as opposed just making sure that upon exec the executed programs will
get the desired environment?
You can use execle or execvpe functions for that.

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