#13525: hWaitForInput with timeout causes program to abort ----------------------------------+-------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: patch Priority: highest | Milestone: 8.2.1 Component: Compiler | Version: 8.0.2 Resolution: | Keywords: Operating System: Linux | Architecture: x86_64 (amd64) Type of failure: Runtime crash | Test Case: Blocked By: | Blocking: Related Tickets: #12912, #8684 | Differential Rev(s): Phab:D3473 Wiki Page: | ----------------------------------+-------------------------------------- Comment (by bgamari): Merged to `master` as, In [changeset:"e5732d2a28dfb8a754ee73e124e3558222a543bb/ghc" e5732d2/ghc]: {{{ base: Fix hWaitForInput with timeout on POSIX This was previously broken (#13252) by f46369b8a1bf90a3bdc30f2b566c3a7e03672518, which ported the fdReady function from `select` to `poll` and in so doing dropping support for timeouts. Unfortunately, while `select` tells us the amount of time not slept (on Linux anyways; it turns out this is implementation dependent), `poll` does not give us this luxury. Consequently, we manually need to track time slept in this case. Unfortunately, portably measuring time is hard. Ideally we would use `clock_gettime` with the monotonic clock here, but sadly this isn't supported on most versions of Darwin. Consequently, we instead use `gettimeofday`, running the risk of system time changes messing us up. Test Plan: Validate Reviewers: simonmar, austin, hvr Reviewed By: simonmar Subscribers: rwbarton, thomie GHC Trac Issues: #13252 Differential Revision: https://phabricator.haskell.org/D3473 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13525#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler