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gh-120754: Update estimated_size in C truncate #121357

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Jul 4, 2024
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gh-120754: Update estimated_size in C truncate #121357

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6 changes: 6 additions & 0 deletions Modules/_io/fileio.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1094,6 +1094,12 @@ _io_FileIO_truncate_impl(fileio *self, PyTypeObject *cls, PyObject *posobj)
return NULL;
}

/* Sometimes a large file is truncated. While estimated_size is used as a
estimate, that it is much larger than the actual size can result in a
significant over allocation and sometimes a MemoryError / running out of
memory. */
self->estimated_size = pos;

return posobj;
}
#endif /* HAVE_FTRUNCATE */
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