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The compiler warning is a false positive, since n_addresses is always
initialised on the success path from parse_argv(), but the compiler
obviously can’t work that out.
Fixes:
src/test/test-nss.c:426:9: warning: 'n_addresses' may be used uninitialized in this function [-Wmaybe-uninitialized]
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Useful for testing a single module. If nothing is specified, behaviour is the
same as before.
$ ./test-nss myhostname 192.168.0.14 localhost
======== myhostname ========
_nss_myhostname_gethostbyname4_r("localhost") → status=NSS_STATUS_SUCCESS
pat=buffer+0x38 errno=0/--- h_errno=0/Resolver Error 0 (no error) ttl=0
"localhost" AF_INET 127.0.0.1 %lo
"localhost" AF_INET6 ::1 %lo
_nss_myhostname_gethostbyname3_r("localhost", AF_INET) → status=NSS_STATUS_SUCCESS
errno=0/--- h_errno=0/Resolver Error 0 (no error) ttl=0
"localhost"
AF_INET 127.0.0.1
canonical: "localhost"
_nss_myhostname_gethostbyname3_r("localhost", AF_INET6) → status=NSS_STATUS_SUCCESS
errno=0/--- h_errno=0/Resolver Error 0 (no error) ttl=0
"localhost"
AF_INET6 ::1
canonical: "localhost"
_nss_myhostname_gethostbyname3_r("localhost", *) → status=NSS_STATUS_SUCCESS
errno=0/--- h_errno=0/Resolver Error 0 (no error) ttl=0
"localhost"
AF_INET 127.0.0.1
canonical: "localhost"
_nss_myhostname_gethostbyname3_r("localhost", AF_UNIX) → status=NSS_STATUS_UNAVAIL
errno=97/EAFNOSUPPORT h_errno=4/No address associated with name ttl=2147483647
_nss_myhostname_gethostbyname2_r("localhost", AF_INET) → status=NSS_STATUS_SUCCESS
errno=0/--- h_errno=0/Resolver Error 0 (no error)
"localhost"
AF_INET 127.0.0.1
_nss_myhostname_gethostbyname2_r("localhost", AF_INET6) → status=NSS_STATUS_SUCCESS
errno=0/--- h_errno=0/Resolver Error 0 (no error)
"localhost"
AF_INET6 ::1
_nss_myhostname_gethostbyname2_r("localhost", *) → status=NSS_STATUS_SUCCESS
errno=0/--- h_errno=0/Resolver Error 0 (no error)
"localhost"
AF_INET 127.0.0.1
_nss_myhostname_gethostbyname2_r("localhost", AF_UNIX) → status=NSS_STATUS_UNAVAIL
errno=97/EAFNOSUPPORT h_errno=4/No address associated with name
_nss_myhostname_gethostbyname_r("localhost") → status=NSS_STATUS_SUCCESS
errno=0/--- h_errno=0/Resolver Error 0 (no error)
"localhost"
AF_INET 127.0.0.1
_nss_myhostname_gethostbyaddr2_r("192.168.0.14") → status=NSS_STATUS_SUCCESS
errno=0/--- h_errno=0/Resolver Error 0 (no error) ttl=0
"laptop"
AF_INET 192.168.0.14
AF_INET 192.168.122.1
AF_INET 169.254.209.76
_nss_myhostname_gethostbyaddr_r("192.168.0.14") → status=NSS_STATUS_SUCCESS
errno=0/--- h_errno=0/Resolver Error 0 (no error)
"laptop"
AF_INET 192.168.0.14
AF_INET 192.168.122.1
AF_INET 169.254.209.76
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Super-important change, yeah!
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When building without resolved and/or myhostname, test-nss.c failed to build
with
src/test/test-nss.c: In function 'main':
src/test/test-nss.c:417:32: error: 'MODULE1' undeclared (first use in this function)
NULSTR_FOREACH(module, MODULE1 MODULE2 MODULE3 MODULE4) {
^
Ensure that all MODULEx are always defined, and empty if the module is not
available (so that it will be a no-op in the string concatenation).
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nss-dns is also "tested". It should be almost always available,
and provides a reference for comparison.
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