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tests: fix test_low_fd_limit failing on RLIM_INFINITY platforms #9149

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tests: fix test_low_fd_limit failing on RLIM_INFINITY platforms #9149

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12 changes: 10 additions & 2 deletions tests/test_misc.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4925,8 +4925,16 @@ def test_set_feerate_offset(node_factory, bitcoind):
def test_low_fd_limit(node_factory, bitcoind):
limits = resource.getrlimit(resource.RLIMIT_NOFILE)

# We assume this, otherwise l2 cannot increase limits!
if limits[0] == limits[1]:
# dev-fd-limit-multiplier is a u32, so values > UINT32_MAX fail option
# parsing. macOS also reports RLIM_INFINITY as the hard limit, making
# "ask for more than the hard limit" meaningless. Cap to a bounded
# ceiling so the test works on any platform.
TEST_CEILING = 65536
if limits[1] == resource.RLIM_INFINITY or limits[1] > TEST_CEILING:
limits = (TEST_CEILING // 2, TEST_CEILING)
resource.setrlimit(resource.RLIMIT_NOFILE, limits)
elif limits[0] == limits[1]:
# We assume this, otherwise l2 cannot increase limits!
limits = (limits[1] // 2, limits[1])
resource.setrlimit(resource.RLIMIT_NOFILE, limits)

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