[RTEMS Project] #4518: RTEMS and LibBSD both provide pipe()

[RTEMS trac]

#4518: RTEMS and LibBSD both provide pipe()
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  Reporter:  Chris Johns     |      Owner:  Chris Johns
      Type:  defect          |     Status:  assigned
  Priority:  normal          |  Milestone:  6.1
 Component:  network/libbsd  |    Version:  6
  Severity:  normal          |   Keywords:
Blocked By:                  |   Blocking:
-----------------------------+-------------------------
 RTEMS provides a `pipe()` call in `cpukit/libfs/src/pipe/pipe.c` and
 LibBSD also provides a call in `rtemsbsd/rtems/rtems-bsd-syscall-api.c`.
 We should have competing calls.

 The selection of the version you get depends on the link order and the
 linker version. The RTEMS 6 linker seems to have a different preference to
 RTEMS 5. Apart from this fragility LibBSD should be providing this
 interface.

 A LibBSD `pipe()` is problematic for a number of reasons and so I am going
 to remove the call from it.

 If LibBSD support is needed it needs to be via a file system op handles
 like all other file system interfaces for descriptor based access. I will
 not be adding this support.

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Ticket URL: <http://devel.rtems.org/ticket/4518>
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