Fix a bug when passing data to GMT in Session.open_virtual_file()#490
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Fix a bug when passing data to GMT in Session.open_virtual_file()#490
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External programs like PyGMT can pass dataset/momory to GMT. By default, GMT can read, modify and free the momery, which sometimes can cause crashes. Issue #406 reports an example in which PyGMT crashes. The issue was reported to the upstream (see GenericMappingTools/gmt#3515 and GenericMappingTools/gmt#3528). It turns out to be a API user error (i.e., a PyGMT bug). As per the explanation of Paul, external programs like PyGMT should always use `GMT_IN|GMT_IS_REFERENCE` to tell GMT that the data is read-only, so that GMT won't try to change and free the memory. This PR makes the change from `GMT_IN` to `GMT_IN|GMT_IS_REFERENCE` in the `Session.open_virtual_file()` function, updates a few docstrings, and also adds the script in #406 as a test.
seisman
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weiji14
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Jun 24, 2020
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Cool, the test looks good. Can you edit the top post and add a link/reference to the GMT C API documentation section for GMT_ IN|GMT_IS_REFERENCE (I'm guessing it's https://docs.generic-mapping-tools.org/dev/api.html#resource-registration?) so others know about it in the future.
Anyways, should be good to merge 🎉
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Description of proposed changes
External programs like PyGMT can pass dataset/momory to GMT. By default,
GMT can read, modify and free the momery, which sometimes can cause
crashes.
Issue #406 reports an example in which PyGMT crashes. The issue was reported
to the upstream (see GenericMappingTools/gmt#3515
and GenericMappingTools/gmt#3528). It turns out
to be an API user error (i.e., a PyGMT bug).
As per the explanation of Paul, external programs like PyGMT should
always use
GMT_IN|GMT_IS_REFERENCEto tell GMT that the data isread-only, so that GMT won't try to change and free the memory.
This PR makes the change from
GMT_INtoGMT_IN|GMT_IS_REFERENCEin the
Session.open_virtual_file()function, updates a few docstrings,and also adds the script in #406 as a test.
Fixes #406.
GMT C API references: https://docs.generic-mapping-tools.org/latest/api.html#resource-registration
Reminders
make formatandmake checkto make sure the code follows the style guide.doc/api/index.rst.