Sets the file descriptor to use as the stderr for spawned processes.
If @fd is -1 then any previously given fd is unset.
Note that the default behaviour is to pass stderr through to the
stderr of the parent process.
The passed @fd belongs to the #GSubprocessLauncher. It will be
automatically closed when the launcher is finalized. The file
descriptor will also be closed on the child side when executing the
spawned process.
You may not set a stderr fd if a stderr file path is already set or
if the launcher flags contain any flags directing stderr elsewhere.
Sets the file descriptor to use as the stderr for spawned processes.
If @fd is -1 then any previously given fd is unset.
Note that the default behaviour is to pass stderr through to the stderr of the parent process.
The passed @fd belongs to the #GSubprocessLauncher. It will be automatically closed when the launcher is finalized. The file descriptor will also be closed on the child side when executing the spawned process.
You may not set a stderr fd if a stderr file path is already set or if the launcher flags contain any flags directing stderr elsewhere.
This feature is only available on UNIX.