Software extension that executes after a predefined event
A user exit is a subroutine invoked by a software package for a predefined event in the execution of the package. In some cases the exit is specified by the installation when configuring the package while in other cases the users of the package can substitute their own subroutines in place of the default ones provided by the package vendor to provide customized functionality. In some cases security controls restrict exits to authorized users, e.g., EXCP appendages in MVS.
The earliest use of this term involved operating systems to let customized code temporarily take control when a pre-designated event occurred.[1][2]
A more typical use is replacing the user exits provided by a sort/merge package,[3][4][5] whereby the user program provides its own subroutines for comparing records. The procedures provided by the user take the place of the default routines (usually stubs that do nothing but return to their caller) provided by the package vendor.
Procedures provided as user exits are typically compiled into a static library and linked directly with the package to produce an executable program. Another approach employs dynamic libraries to accomplish the same thing. Finally, user exits may be external programs executed at specific points in the execution of a host package.[6]
^IBM term: OS/MFT, MVT "OS User Exits". Computerworld. April 11, 1977. p. 25. ... so that execution ... under OS/MFT or MVT. ... ease of use for applications with ... user exits
^"Platform Server for z/OS Installation and Operations Guide" (PDF). Using MFT Platform Server Exits describes the User Exits that ...
^"COBOL E15 user exit: passing or changing records for sort". If both E15 and E35 user exits are used ... SORTIN DD statement
^"Sorting Using the User Exit". SAP.com (SAP Documentation).
^"Unicenter CA-Sort for VSE" (PDF). If Unicenter CA-Sort overlays the user exit storage with ...
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