I defined a new type VSI_RETVAL to be used instead of int with VSI
functions that return -1 in error and set errno.
For the Perl bindings I defined two typemaps for this type. One which
strips the return value and one which throws an error if the return
value is -1. The error is strerror(errno).
I think this improves the usability of those VSI functions from the
binded languages.
Ari
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