PK29718: FSEEK(SEEK_CUR) WITH A NEGATIVE OFFSET USING MULTIVOLUME DATASET

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• c/c++ applications that use fseek(SEEK_CUR) with a negative
  offset to seek backwards across volumes in a multivolume
  data set, and then call fread() to read data from the
  new position, may experience data loss.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: C/C++ users that use fseek(SEEK_CUR)         *
  *                 with a negative offset to get a previous     *
  *                 position across volumes on a multivolume     *
  *                 data set.                                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Using fseek(SEEK_CUR) with a negative   *
  *                      offset to seek backwards across         *
  *                      volumes in a multivolume data set,      *
  *                      and then calling fread() to             *
  *                      read data from the new position, may    *
  *                      cause data loss.                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Data loss may occur after calling fseek(SEEK_CUR) with a
  negative offset (used to seek backwards across volumes),
  followed by an fread() call used to read data from a
  multivolume data set.
  

Problem conclusion

• Code is updated to prevent problem as described in the
  Problem Description.
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UK17176

Modules/Macros

• CELHOSRB CELQOSRB EDC40038
  

Fix information

• Fixed component name

  LE C LIBRARY

• Fixed component ID

  568819805

Applicable component levels

• R730 PSY UK17176

     UP06/08/29 P F608 Ž

Fix is available

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