From: eregontp@... Date: 2016-04-13T22:12:30+00:00 Subject: [ruby-core:74940] [Ruby trunk Bug#12280] IO.copy_stream(IO, IO) fails with "pread() not implemented" Issue #12280 has been updated by Benoit Daloze. Eric Wong wrote: > eregontp@gmail.com wrote: > > IO.copy_stream on Windows with IO having an offset fails with: > > NotImplementedError: pread() not implemented > > > > This seems suboptimal, should a clearer be reported? > > Not sure. Maybe include a bug report address to get pread > implemented in Windows? :) > > > Is it a platform limitation? > > Yes, it's a platform limitation. > > lseek+read can be used to workaround the limitation in > single-threaded programs only (and only as long as the FD is not > shared across fork; maybe FD sharing across fork isn't possible > in Windows...) > > But I guess an error message is better than a racy workaround > which can corrupt data with concurrent access. Thanks for the quick reply! For me, having a message like: "NotImplementedError: IO.copy_stream with offset is not supported on Windows since it is not atomic" would be a good enough fix for this. ---------------------------------------- Bug #12280: IO.copy_stream(IO, IO) fails with "pread() not implemented" https://bugs.ruby-lang.org/issues/12280#change-58069 * Author: Benoit Daloze * Status: Open * Priority: Normal * Assignee: * ruby -v: * Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN ---------------------------------------- IO.copy_stream on Windows with IO having an offset fails with: NotImplementedError: pread() not implemented This seems suboptimal, should a clearer be reported? Is it a platform limitation? -- https://bugs.ruby-lang.org/ Unsubscribe: