* tests/test-sethostname1.c: New file, extracted from
tests/test-sethostname.c.
* tests/test-sethostname2.c: New file, extracted from
tests/test-sethostname.c.
* tests/test-sethostname.c: Remove file.
* modules/sethostname-tests (Files): Add tests/test-sethostname1.c,
tests/test-sethostname2.c. Remove tests/test-sethostname.c.
(Depends-on): Add gethostname.
(Makefile.am): Compile both test-sethostname1 and test-sethostname2.
Link the latter with $(GETHOSTNAME_LIB).
* tests/test-sethostname.c: Don't include <sys/types.h>.
(geteuid): Use a dummy value without uid_t.
* modules/sethostname-tests (Depends-on): Remove sys_types.
* modules/sethostname-tests (Files): Sort by decreasing importance.
(configure.ac): Check for geteuid.
* tests/test-sethostname.c (main): Emit error messages to stderr. Skip
the test when there's nothing to test. Drop an unnecessary cast.
Improve an error message. Verify that the final sethostname() call
succeeds.
Provide a module that tests the functionality of sethostname().
* modules/sethostname-tests: New file. A test program
for the sethostname module.
* tests/test-sethostname.c: Likewise.
Signed-off-by: Ben Walton <bwalton@artsci.utoronto.ca>