Answer / reecha

Signature can be said to be do wat the level identifier of
physical file do. It help the programs to know if any
service program is updated or not . As many program would
be using this service Program so compliting all of them is
cumbersome so Binder langanguage provide the solution .
When the program calling the service program is compiled
its stores the signature of the service program . If the
service progranm is changed so does the signature of it.
The work around is the Binder language For eg

STRPGMEXP PGMLVL(*CURRENT)
EXPORT SYMBOL(A)
EXPORT SYMBOL(B)
EXPORT SYMBOL(C)
ENDPGMEXP

if changes r made to Service program(new procedure D is
added0 the Binder language will be :

STRPGMEXP PGMLVL(*CURRENT)
EXPORT SYMBOL(A)
EXPORT SYMBOL(B)
EXPORT SYMBOL(C)
EXPORT SYMBOL(D)
ENDPGMEXP
STRPGMEXP PGMLVL(*PRV)
EXPORT SYMBOL(A)
EXPORT SYMBOL(B)
EXPORT SYMBOL(C)
ENDPGMEXP


now one need not to compile the programs calling service
program & the program will run proeperly as thr will be no
signature violation as the binder language have both
current and previous signature.

Answer / syam

A service program is a collection of runnable procedures
and available data items easily and directly accessible by
other ILE programs or service programs. In many respects, a
service program is similar to a subroutine library or
procedure library.
Once we have the binder language we want to use in a source
member,it is compiled at the time we create the service
program Create Service Program (CRTSRVPGM).

Binder language is stored in physical file members, like
RPG, CL, and DDS source code.

CUSTPROCS service program Source member type BND
example.

STRPGMEXP PGMLVL(*CURRENT)
EXPORT SYMBOL(GetCustInfo)
EXPORT SYMBOL(SearchByPhone)
EXPORT SYMBOL(ValidCust)
ENDPGMEXP

Signature in Binder

Hard-Coded Signature Values:

One way a hard-coded signature can be used to our advantage
is to put some meaningful information into the signature
for documentation purposes.
for example: the date, the time, or other usefulinformation
about the new version of the service program.

STRPGMEXP PGMLVL(*CURRENT) SIGNATURE('CUSTPROCS19SEP07')
EXPORT SYMBOL(GetCustInfo)
EXPORT SYMBOL(SearchByPhone)
EXPORT SYMBOL(ValidCust)
ENDPGMEXP

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