pgsql: Add some functions to fd.c for the convenience of extensions.

Add some functions to fd.c for the convenience of extensions.

For example, if you want to perform an ioctl() on a file descriptor
opened through the fd.c routines, there's no way to do that without
being able to get at the underlying fd.

KaiGai Kohei

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/070140ee48e8524493f882a278b5ced255b34b65

Modified Files
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src/backend/storage/file/fd.c | 34 ++++++++++++++++++++++++++++++++++
src/include/storage/fd.h      |  3 +++
2 files changed, 37 insertions(+)