Re: Need help with adding a new service to nsswitch.conf

[Florian Weimer <fweimer@redhat.com>]

* Pranjal Goswami via Libc-help:

> Hi Friends ,
> I am looking at adding another service in nsswitch.conf which can look for
> user presence in a file other than /etc/password. I have copied the files
> from nss_files  to a new folder and I  have made the changes in the
> Makefile  under nss to get my module to build.. However I get an error when
> I try  to build glibc.
> /../include/libc-symbols.h:34:32: warning: "MODULE_libnss_secmgr" is not
> defined, evaluates to 0 [-Wundef]
>    34 | #define IN_MODULE  PASTE_NAME (MODULE_, MODULE_NAME)
>       |                                ^~~~~~~
> ./../include/libc-symbols.h:32:26: note: in definition of macro
> 'PASTE_NAME1'
>    32 | #define PASTE_NAME1(a,b) a##b
>       |                          ^
> ./../include/libc-symbols.h:34:20: note: in expansion of macro 'PASTE_NAME'
>    34 | #define IN_MODULE  PASTE_NAME (MODULE_, MODULE_NAME)
>
> secmgr is the module that I am adding. I suspect that the problem is
> related to the  line NSS_DECLARE_MODULE_FUNCTIONS (secmgr).
> So if we are adding a new service under nss , what additional things we
> need to do besides adding a module under nss and having teh same set of
> files as in nss/files - renamed to the  new service that that  am using?

Is there a reason why you need to build your NSS module under the glibc
build system?  <nss.h> is an installed header file, and you can use
NSS_DECLARE_MODULE_FUNCTIONS (secmgr) to get declarations for all the
recognized plug-in functions.

Thanks,
Florian