setNonBlockingFD fd set = do
flags <- throwErrnoIfMinus1Retry "setNonBlockingFD"
(c_fcntl_read fd const_f_getfl)
- -- An error when setting O_NONBLOCK isn't fatal: on some systems
- -- there are certain file handles on which this will fail (eg. /dev/null
- -- on FreeBSD) so we throw away the return code from fcntl_write.
let flags' | set = flags .|. o_NONBLOCK
| otherwise = flags .&. complement o_NONBLOCK
unless (flags == flags') $ do
+ -- An error when setting O_NONBLOCK isn't fatal: on some systems
+ -- there are certain file handles on which this will fail (eg. /dev/null
+ -- on FreeBSD) so we throw away the return code from fcntl_write.
_ <- c_fcntl_write fd const_f_setfl (fromIntegral flags')
return ()
#else