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Handle dlopen(NULL) failure in glibc fallback #12716

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Jul 9, 2024
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17 changes: 15 additions & 2 deletions src/pip/_internal/utils/glibc.py
Original file line number Diff line number Diff line change
Expand Up @@ -40,7 +40,20 @@ def glibc_version_string_ctypes() -> Optional[str]:
# manpage says, "If filename is NULL, then the returned handle is for the
# main program". This way we can let the linker do the work to figure out
# which libc our process is actually using.
process_namespace = ctypes.CDLL(None)
#
# We must also handle the special case where the executable is not a
# dynamically linked executable. This can occur when using musl libc,
# for example. In this situation, dlopen() will error, leading to an
# OSError. Interestingly, at least in the case of musl, there is no
# errno set on the OSError. The single string argument used to construct
# OSError comes from libc itself and is therefore not portable to
# hard code here. In any case, failure to call dlopen() means we
# can proceed, so we bail on our attempt.
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try:
process_namespace = ctypes.CDLL(None)
except OSError:
return None

try:
gnu_get_libc_version = process_namespace.gnu_get_libc_version
except AttributeError:
Expand All @@ -50,7 +63,7 @@ def glibc_version_string_ctypes() -> Optional[str]:

# Call gnu_get_libc_version, which returns a string like "2.5"
gnu_get_libc_version.restype = ctypes.c_char_p
version_str = gnu_get_libc_version()
version_str: str = gnu_get_libc_version()
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I just copied over the full _glibc_version_string_ctypes from _manylinux.py, and this was the only other change. I can back it out if desired.

# py2 / py3 compatibility:
if not isinstance(version_str, str):
version_str = version_str.decode("ascii")
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