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gfs_test - check the status of a non-blocking call
#include <gfs.h>
int gfs_test(gfs_handle handle);
gfs_test tests whether the non-blocking call associated with
handle has completed yet.
gfs_test Returns 1 if the call has completed, 0 if it
hasn't, and -1 on an error.
GFS_EINVAL
handle is not a valid handle.
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