Author: Julia Lawall <julia@diku.dk> ME_IO_SINGLE_TYPE_WRITE_NONBLOCKING and ME_IO_STREAM_CONFIG_WRAPAROUND both hanve 0 as the rightmost bit, and thus eg !flags & ME_IO_SINGLE_TYPE_WRITE_NONBLOCKING is always 0. I assume that !(flags & ME_IO_SINGLE_TYPE_WRITE_NONBLOCKING) and !(flags & ME_IO_STREAM_CONFIG_WRAPAROUND) were intended. The semantic patch that makes this change is as follows: (http://www.emn.fr/x-info/coccinelle/) // @@ expression E; constant C; @@ ( !E …