O_SYNC

[Jeff Johnston]

Corinna Vinschen wrote:
> Hi,
> 
> in libc/include/sys/fcntl.h, the O_SYNC flag is guarded by "#ifndef
> _POSIX_SOURCE", together with these unlucky BSD defines FAPPEND, FSYNC,
> etc.  However, O_SYNC is defined by SUSv3 as part of the "Synchronized
> Input and Output" extension [SIO], together with its siblings O_DSYNC
> and O_RSYNC.  Shouldn't O_SYNC be taken out of the "#ifndef _POSIX_SOURCE"
> guarded part and be always defined instead?
>

Yes, it is documented in the POSIX standard and should be outside of the 
#ifndef.

-- Jeff J.