Creating an NSS module

["Darío Mariani" <dmarian@fi.uba.ar>]

  Hello:
  I'm creating an NSS module for the passwd and group databases. I 
implemented the following functions:

nss_status _nss_authon_setgrent()
nss_status _nss_authon_endgrent()
nss_status _nss_authon_getgrent_r (group * gr, char * buffer, size_t 
buflen, int * errnop)
nss_status _nss_authon_getgrnam_r (const char * name, struct group * gr, 
char * buffer, size_t buflen, int * errnop)
nss_status _nss_authon_getgrgid_r (const gid_t gid, struct group * gr, 
char * buffer, size_t buflen, int *errnop)

nss_status _nss_authon_setpwent()
nss_status _nss_authon_endpwent()
nss_status _nss_authon_getpwent_r (passwd * pw, char * buffer, size_t 
buflen, int * errnop)
nss_status _nss_authon_getpwnam_r (const char * name, struct passwd * 
result, char * buffer, size_t buflen, int * errnop)
nss_status _nss_authon_getpwuid_r (uid_t uid, passwd * result, char * 
buffer, size_t buflen, int * errnop)

The libc functions getgrent(), getgrnam(), getgrgid() and the finger 
command work, but the groups command doesn't and also the chgrp doesn't 
work for an user other than root. Any ideas on what happens? Am I 
missing some function?
Thanks,
            Darío

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