pipeio: prevent race between SIGCHLD and open()

Changes in v2:
- use TERRNO instead of strerror(errno)
- differentiate error messages from semaphores
- add warning if parent times out while waiting for child processes to exit

Jan Stancek (2):
pipeio: convert strerror(errno) to TERRNO
pipeio: prevent race between SIGCHLD and open()

  testcases/kernel/ipc/pipeio/pipeio.c |   71 
+++++++++++++++++++++++++--------
  1 files changed, 54 insertions(+), 17 deletions(-)

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