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* simplify nscd lookup code for alt passwd/group backendsRich Felker2015-03-151-1/+0
| | | | | | | | | | | | previously, a sentinel value of (FILE *)-1 was used to inform the caller of __nscd_query that nscd is not in use. aside from being an ugly hack, this resulted in duplicate code paths for two logically equivalent cases: no nscd, and "not found" result from nscd. now, __nscd_query simply skips closing the socket and returns a valid FILE pointer when nscd is not in use, and produces a fake "not found" response header. the caller is then responsible for closing the socket just like it would do if it had gotten a real "not found" response.
* support alternate backends for the passwd and group dbsJosiah Worcester2015-02-231-1/+139
| | | | | | | | when we fail to find the entry in the commonly accepted files, we query a server over a Unix domain socket on /var/run/nscd/socket. the protocol used here is compatible with glibc's nscd protocol on most systems (all that use 32-bit numbers for all the protocol fields, which appears to be everything but Alpha).
* refactor group file access codeJosiah Worcester2015-02-131-0/+32
this allows getgrnam and getgrgid to share code with the _r versions in preparation for alternate backend support.