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<strong>4144</strong> Rev. 2<br />

<strong>UP</strong>.NUMBER<br />

Label<br />

Block<br />

File<br />

Area<br />

EOF<br />

Block<br />

Void FASTRAND Files<br />

Label<br />

Block<br />

EOF<br />

Block<br />

13.8. ERROR PROCESSING<br />

UNIVAC 1100 SERIES SYSTEMS 13-46<br />

Label<br />

Block<br />

File<br />

Area<br />

Label<br />

Block<br />

File<br />

Area<br />

Figure 13·10. Item Level FASTRAND·Formatted Mass Storage File "Organization<br />

PAGE REVISION PAGE<br />

File<br />

Area<br />

EOF<br />

Block<br />

EOF<br />

Block<br />

The executive returns control to the user program when a device, file, or abnormal error condition is detected. The return of<br />

control is accomplished through the appropriate error exit control word specified in the FCT for the file being processed. A<br />

description is provided for each catagory of error conditions and the respective codes that it returns to the user program.<br />

13.8.1. DEVICE ERROR HANDLING<br />

The oc;currence of a device error causes control to be returned to the user program by means of the device exit control word<br />

specified in the FCT (see 13.5.1). When control is returned, the status code for the particular device error is in H1 of register<br />

AO and the user's reentry location is in H2 of register AO. If the file is processed in the input mode, register A 1 contains the<br />

size and data location of the data block that was being read when the error occurred. See Table 13-1 for descriptions of the<br />

status codes for device error.<br />

13.8.2. FILE ERROR HANDLING<br />

File errors are the result of a user's request that has violated prescribed block buffering package procedures. For each<br />

occurrence of a file error, control is returned to the user program by means of the user's file error exit specified in the FCT<br />

(see 13.5.1) of the file being processed. An error code and the user reentry location are returned to the user in H 1 and H2,<br />

respectively, of register AO. Possible error codes and their descriptions are listed in Table 13-1.

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