* Test case for LockedFreePort not colliding with port 0
changelog_begin
changelog_end
* Discover dynamic port range on Linux
* Random port generator outside ephemeral range
* remove dev comments
* Draw FreePort from outside the ephemeral port range
Note, there is a race condition between the socket being closed and the
lock-file being created in LockedFreePort. This is not a new issue, it
was already present with the previous port 0 based implementation.
LockedFreePort handles this by attempting to find a free port and taking
a file lock multiple times.
But, it could happen that A `find`s port N, and obtains the lock, but
doesn't bind port N again, yet; then B binds port N during `find`; then
A attempts to bind port N before B could release it again and fails
because B still holds it.
* Select dynamic port range based on OS
* Detect dynamic port range on MacOS and Windows
* Import sysctl from Nix on MacOS
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* Windows line separator
* FreePort helpers visibility
* Use more informative exception types
* Use a more light weight unit test
* Add comments
* Fix Windows
* Update libs-scala/ports/src/main/scala/com/digitalasset/ports/FreePort.scala
Co-authored-by: Stefano Baghino <43749967+stefanobaghino-da@users.noreply.github.com>
* Update libs-scala/ports/src/main/scala/com/digitalasset/ports/FreePort.scala
Co-authored-by: Stefano Baghino <43749967+stefanobaghino-da@users.noreply.github.com>
* Add a comment to clarify the generated port range
* fmt
* unused import
* Split libs-scala/ports
Splits the FreePort and LockedFreePort components into a separate
library as this is only used for testing purposes.
Co-authored-by: Andreas Herrmann <andreas.herrmann@tweag.io>
Co-authored-by: Stefano Baghino <43749967+stefanobaghino-da@users.noreply.github.com>
