nCommon Open Flags:
uexcl (O_EXCL) Exclusive open. (don't share)
undelay (O_NDELAY) Non-delay open. (don't block)
unonblock (O_NONBLOCK)
Non-blocking open/read/write.
udirect (O_DIRECT) Direct disk access. (don't cache
data).
ursync (O_RSYNC) Synchronize read operations.
usync (O_SYNC) Sync updates for data/file
attributes.
ularge (O_LARGEFILE) Enable large (64-bit) file system
support.
u
nOutput Open Flags:
uappend (O_APPEND) Append data to end of existing file.
udefer (O_DEFER) Defer updates to file during
writes.
udsync (O_DSYNC) Sync data to disk during write
operations.
utrunc (O_TRUNC) Truncate an existing file before
writing.
n
nExample:
u# dt of=dt.data
flags=direct oflags=trunc ...
n