RTEMS POSIX 1003.1 Compliance Guide
open(), Function, Implemented O_RDONLY, Constant, Implemented O_WRONLY, Constant, Implemented O_RDWR, Constant, Implemented O_APPEND, Constant, Implemented O_CREAT, Constant, Implemented O_DSYNC, Constant, Unimplemented O_EXCL, Constant, Implemented O_NOCTTY, Constant, Implemented O_NONBLOCK, Constant, Implemented O_RSYNC, Constant, Unimplemented O_SYNC, Constant, Implemented O_TRUNC, Constant, Implemented
NOTE: In the newlib fcntl.h, O_SYNC is defined only if _POSIX_SOURCE is not defined. This seems wrong.
RTEMS POSIX 1003.1 Compliance Guide
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