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- User_exit abstract "A user exit is a subroutine invoked by a software package for a predefined event in the execution of the package. Clients of the package can substitute their own subroutines in place of the default ones provided by the package vendor to provide customized functionality.A typical use is replacing the user exits provided by a sort/merge package, 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.If the user site specific code is substituted for the software vendor provided default exit it must interface to the software package using the defined parameters as documented for the default exit. User exits are important because while they enable site specific customization they isolate such installation specific customization to defined and supported points enabling the site to upgrade to follow-on releases of the software package without adverse impact to preexisting customized functionality. Some references to IBM user exit manuals are given below. Other vendors such as SAP, Oracle, HP, Macro4, Compuware, CA all employ user exits in some of their software products.Historically, this term is commonly used in IBM mainframe vernacular. Title: z/OS V1R10 DFSMS Installation Exits Document Number: SC26-7396-11 Title: z/OS V1R10.0 JES2 Installation Exits Document Number: SA22-7534-10 Title: z/OS V1R10.0 MVS Installation Exits Document Number: SA22-7593-14↑".
- User_exit wikiPageID "9934699".
- User_exit wikiPageRevisionID "568413624".
- User_exit hasPhotoCollection User_exit.
- User_exit subject Category:Control_flow.
- User_exit subject Category:Subroutines.
- User_exit type Abstraction100002137.
- User_exit type Code106355894.
- User_exit type CodingSystem106353757.
- User_exit type Communication100033020.
- User_exit type Routine106582403.
- User_exit type Software106566077.
- User_exit type Subroutines.
- User_exit type Writing106359877.
- User_exit type WrittenCommunication106349220.
- User_exit comment "A user exit is a subroutine invoked by a software package for a predefined event in the execution of the package. Clients of the package can substitute their own subroutines in place of the default ones provided by the package vendor to provide customized functionality.A typical use is replacing the user exits provided by a sort/merge package, whereby the user program provides its own subroutines for comparing records.".
- User_exit label "User exit".
- User_exit sameAs m.02pxgwx.
- User_exit sameAs Q7901838.
- User_exit sameAs Q7901838.
- User_exit sameAs User_exit.
- User_exit wasDerivedFrom User_exit?oldid=568413624.
- User_exit isPrimaryTopicOf User_exit.