Difference between revisions of "LOCK (access)"

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*LOCK READ WRITE: When specified any access is denied to other file procedures.
*LOCK READ WRITE: When specified any access is denied to other file procedures.


*If another process already has access to a specified file, program access is denied for that file OPEN access. A "Permission Denied" error 70 will be returned. A network program must be able to handle a denial of access error.






 
''See also:'' [[ACCESS]], [[ON ERROR]]
''See also:'' [[ACCESS]]

Revision as of 00:14, 27 February 2010

A LOCK access READ or WRITE can be specified in a file OPEN statement in a network environment(DOS 3.1 or higher).


  • Default: When LOCK is not specified in an OPEN statement, all other processes are denied file access.
  • LOCK READ: When specified, read access is denied to other file procedures.
  • LOCK WRITE: When specified, write access is denied to other file procedures.
  • LOCK READ WRITE: When specified any access is denied to other file procedures.
  • If another process already has access to a specified file, program access is denied for that file OPEN access. A "Permission Denied" error 70 will be returned. A network program must be able to handle a denial of access error.


See also: ACCESS, ON ERROR