std: Fix some behavior without stdio handles #31177
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On all platforms, reading from stdin where the actual stdin isn't present should return 0 bytes as having been read rather than the entire buffer. On Windows, handle the case where we're inheriting stdio handles but one of them isn't present. Currently the behavior is to fail returning an I/O error but instead this commit corrects it to detecting this situation and propagating the non-set handle. Closes rust-lang#31167
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On all platforms, reading from stdin where the actual stdin isn't present should return 0 bytes as having been read rather than the entire buffer. On Windows, handle the case where we're inheriting stdio handles but one of them isn't present. Currently the behavior is to fail returning an I/O error but instead this commit corrects it to detecting this situation and propagating the non-set handle. Closes rust-lang#31167
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On all platforms, reading from stdin where the actual stdin isn't present should
return 0 bytes as having been read rather than the entire buffer.
On Windows, handle the case where we're inheriting stdio handles but one of them
isn't present. Currently the behavior is to fail returning an I/O error but
instead this commit corrects it to detecting this situation and propagating the
non-set handle.
Closes #31167