Commit 9d7d648088 ("alpha: Use the generic gethostname") removed the
alpha gethostname.c to use sysdeps/posix/gethostname.c, but
sysdeps/unix precedes sysdeps/posix and its syscalls.list has a
gethostname entry. alpha is the only Linux target defining
__NR_gethostname, so it now gets a raw syscall wrapper. The kernel
truncates the name and returns 0, so a too-small buffer is no longer
an error:
tst-gethostname.c:95: not true: gethostname (hostname, HOST_NAME_MAX) == -1
nss/test-netdb crashes because gethostname (NULL, 0) now succeeds.
qemu-user does not show this; it implements the syscall with the
host's gethostname.
No other target uses the entry: other Linux targets lack
__NR_gethostname and Hurd has its own gethostname.c.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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