Later Developments
Later error recovery systems would provide for specifying errors explicitly as opposed to by the position of the parameter on the STXIT macro.
On IBM mainframes, newer operating systems such as OS/VS1 replaced the STXIT macro with the SPIE ("Set Program Interrupt Exit") and STAE ("Set Task Abnormal Exit") macroes. Univac's VS/9 continued to support STXIT but also added the CRTN ("Contingency Routine") macro to provide even more powerful error recovery, as well as recovery of some errors which STXIT did not capture. Originally, CRTN and STXIT could not be used together. Later releases of the operating system provided for both; if a CRTN and a STXIT macro were both used, the CRTN handled any events not covered by STXIT; if both were used to cover an event, the STXIT routine handled the event and the CRTN routine was not invoked.
Read more about this topic: STXIT
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