llvm/utils/lit/tests/shtest-external-shell-kill.py

   1 # This test exercises an external shell use case that, at least at one time,
   2 # appeared in the following tests:
   3 #
   4 #   compiler-rt/test/fuzzer/fork-sigusr.test
   5 #   compiler-rt/test/fuzzer/merge-sigusr.test
   6 #   compiler-rt/test/fuzzer/sigint.test
   7 #   compiler-rt/test/fuzzer/sigusr.test
   8 #
   9 # That is, a RUN line can be:
  10 #
  11 #   cmd & PID=$!
  12 #
  13 # It is important that '&' only puts 'cmd' in the background and not the
  14 # debugging commands that lit inserts before 'cmd'.  Otherwise:
  15 #
  16 # - The debugging commands might execute later than they are supposed to.
  17 # - A later 'kill $PID' can kill more than just 'cmd'.  We've seen it even
  18 #   manage to terminate the shell running lit.
  19 #
  20 # The last FileCheck directive below checks that the debugging commands for the
  21 # above RUN line are not killed and do execute at the right time.
  22
  23 # RUN: %{lit} -a %{inputs}/shtest-external-shell-kill | %{filter-lit} | FileCheck %s
  24 # END.
  25
  26 #       CHECK: Command Output (stdout):
  27 #  CHECK-NEXT: --
  28 #  CHECK-NEXT: start
  29 #  CHECK-NEXT: end
  30 # CHECK-EMPTY:
  31 #  CHECK-NEXT: --
  32 #  CHECK-NEXT: Command Output (stderr):
  33 #  CHECK-NEXT: --
  34 #  CHECK-NEXT: RUN: at line 1: echo start
  35 #  CHECK-NEXT: echo start
  36 #  CHECK-NEXT: RUN: at line 2: sleep [[#]] & PID=$!