Changes for z/OS V1R9 UNIX System Services include the following:

  • You can use IBM Health Checker for z/OS to determine whether there are differences between current system settings and the settings defined in the BPXPRMxx member of SYS1.PARMLIB.                                                
  • System management facilities (SMF) collects data for accounting. A deletion record has been added to SMF reports that indicates when a file has been deleted or renamed.
  • Using sockets, dbx can communicate with a GUI front-end.
  • An updated method of ending threads and their associated tasks is available. You can use a new environment variable, _BPXK_FORCE_CANCEL, to end targeted threads.
  • Previously, file systems were mounted with the AUTOMOVE attribute, even if the parent file system was mounted with the UNMOUNT attribute. Now, if the parent file system was mounted with the UNMOUNT attribute, the file system will be mounted with the UNMOUNT attribute instead.
  • Previously, the setuid identity was not propagated across a fork or exec. A new environment variable, _BPXK_SUID_FORK can be set to indicate whether the setuid indicator is to be propagated from the parent to child.
  • NFS Client for z/OS is upgrading to the Version 4 protocols of the Network File System architecture. To support the upgrade, LFS support has been provided.
  • Previously, for shared file systems, the automove behavior of file systems was not predictable. More consistent and predictable behavior for file system shutdown and recovery based on the AUTOMOVE setting of the file system has been implemented.
  • Previously, callers running from a service request block (SRB) in 64-bit addressing mode could not use UNIX System Services because the services were not supported. UNIX System Services now supports programs that are running on SRB dispatchable units in addition to the more standard task control blocks (TCBs).
  • Support of decimal floating points has been added to dbx.
  • Previously, memory maps could not be used from a key 2 environment. Support has been added for memory map of files in key 2 storage areas for PSW Key 2 caller.
  • You can use standard message queues to deliver asynchronous completion notifications.


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