DosErrClass (FAPI)

This call helps OS/2 applications respond to error codes (return codes) received from OS/2.

Syntax

DosErrClass (Code, Class, Action, Locus)

Parameters

Code (USHORT) - input

Error code returned by an OS/2 function.

Class (PUSHORT) - output

Address of the classification of an error.

Action (PUSHORT) - output

Address of the action for an error.

Locus (PUSHORT) - output

Address of the origin of an error.

Return Code

rc (USHORT) - return

Return code descriptions are:

• 0 NO_ERROR

Remarks

The input is a return code returned from another function call, and the output is a classification of the return and recommended action. Depending on the application, the recommended action could be followed, or a more specific application recovery could be performed.

The following values are returned in Class, Action, and Locus:

Class Definitions

  VALUE      MNEMONIC     DESCRIPTION
  
  1          OUTRES       Out of resources
  2          TEMPSIT      Temporary situation
  3          AUTH         Authorization failed
  4          INTRN        Internal error
  5          HRDFAIL      Device hardware failure
  6          SYSFAIL      System failure
  7          APPERR       Probable application error
  8          NOTFND       Item not located
  9          BADFMT       Bad format for call/data
  10         LOCKED       Resource/data locked
  11         MEDIA        Incorrect media, CRC error
  12         ALREADY      Resource/action already taken/done/exists
  13         UNK          Unclassified
  14         CANT         Can't perform requested action
  15         TIME         Timeout

Action Definitions

  VALUE      MNEMONIC     DESCRIPTION

  1          RETRY        Retry immediately
  2          DLYRET       Delay and retry
  3          USER         Bad user input - get new values
  4          ABORT        Terminate in an orderly manner
  5          PANIC        Terminate immediately
  6          IGNORE       Ignore error
  7          INTRET       Retry after user intervention

Locus Definitions

  VALUE      MNEMONIC     DESCRIPTION

  1          UNK          Unknown
  2          DISK         Random access device such as a disk
  3          NET          Network
  4          SERDEV       Serial device
  5          MEM          Memory

Family API Considerations

Some options operate differently in the DOS mode than in the OS/2 mode. Therefore, the following considerations apply to DosErrClass when coding for the DOS mode:

When DosErrClass is called by a family application, it returns a valid error classification for returns that have occurred. The classifications of a given return code may not be the same for the Family API and the OS/2 mode applications.

Example Code

C Binding

#define INCL_DOSMISC

USHORT  rc = DosErrClass(Code, Class, Action, Locus);

USHORT           Code;          /* Error code for analysis */
PUSHORT          Class;         /* Error classification (returned) */
PUSHORT          Action;        /* Recommended action (returned) */
PUSHORT          Locus;         /* Error locus (returned) */

USHORT           rc;            /* return code */

This example attempts to delete a non-existent file. The error returned is then plugged into DosErrClass for more information about the error and what actions should be taken.

#define INCL_DOSQUEUES

#define RESERVED 0L
#define FILE_DELETE "adlkjf.dkf"

USHORT Error;
USHORT Class;
USHORT Action;
USHORT Locus;
USHORT rc;

   Error = DosDelete(FILE_DELETE,      /* File name path */
                     RESERVED);        /* Reserved (must be zero) */
   rc = DosErrClass(Error,             /* Error code for analysis */
                    &Class,            /* Error classification */
                    &Action,           /* Recommended action */
                    &Locus);           /* Error locus */

MASM Binding

EXTRN  DosErrClass:FAR
INCL_DOSMISC      EQU 1

PUSH   WORD    Code          ;Error code for analysis
PUSH@  WORD    Class         ;Error classification (returned)
PUSH@  WORD    Action        ;Recommended action (returned)
PUSH@  WORD    Locus         ;Error locus (returned)
CALL   DosErrClass

Returns WORD