To turn off C2M messages during record I/O, set the variable _C2M_MSG (in <recio.h>) to zero. If _C2M_MSG is set to a different value, record I/O sends C2M messages to your program when it detects any of the following errors: C2M3003, C2M3004, C2M3005, C2M3009, C2M3014, C2M3015, C2M3040, C2M3041, C2M3042 and C2M3044.
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