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39 lines (35 loc) · 1.35 KB
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Copy pathlayout.py
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39 lines (35 loc) · 1.35 KB
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"""Catch typed resource failures while loading or running the owned ELF adapter.
Only this package's fixed sibling is executed; caller input stays in request.json.
Interpreter startup failures before this boundary remain unclassified.
"""
import os
import sys
def resource_exit(status, marker):
try:
if len(sys.argv) > 2:
descriptor = os.open(sys.argv[1], os.O_WRONLY | os.O_CREAT | os.O_EXCL, 0o600)
os.write(descriptor, marker)
os.close(descriptor)
except (OSError, MemoryError):
# Without a complete marker the parent keeps this failure unclassified.
pass
os._exit(status)
try:
implementation = os.path.join(os.path.dirname(__file__), "layout_impl.py")
with open(implementation, "rb") as handle:
source = handle.read()
exec(compile(source, implementation, "exec"), {
"__file__": implementation,
"__name__": "__main__",
})
except MemoryError:
# Reserved status: an observed allocation failure, including imports/compile.
resource_exit(75, b"M")
except OSError as error:
# Linux ENOMEM is an observed allocation failure, independent of error text.
if error.errno == 12:
resource_exit(75, b"M")
# Linux EFBIG is observed directly, including a partial limits/reply write.
if error.errno == 27:
resource_exit(76, b"F")
raise