tst-getpw: Rewrite.

The test is rewritten to look for the testable conditions and
exit once they are all detected. This prevents the test from
iterating over 2000 UIDs and looking up each one. It speeds up
the test and prevents it from failing if the system under test
has an NSS-based passwd that is slower than the test timeout.

See:
https://sourceware.org/ml/libc-alpha/2015-01/msg00394.html

2 files changed, 79 insertions, 6 deletions

diff --git a/ChangeLog b/ChangeLog
index d83be7a..4462627 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,7 @@
 2015-01-21  Carlos O'Donell  <carlos@redhat.com>
 
+	* pwd/tst-getpw.c: Rewrite.
+
 	[BZ #17702]
 	* dlfcn/Makefile (tests): Add tst-rec-dlopen.
 	(modules-names): Add moddummy1 and moddummy2.
diff --git a/pwd/tst-getpw.c b/pwd/tst-getpw.c
index 059c9e0..e3e101b 100644
--- a/pwd/tst-getpw.c
+++ b/pwd/tst-getpw.c
@@ -15,28 +15,99 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+#include <stdio.h>
 #include <pwd.h>
+#include <errno.h>
+#include <stdbool.h>
+
+/* We want to test getpw by calling it with a uid that does
+   exist and one that doesn't exist. We track if we've met those
+   conditions and exit. We also track if we've failed due to lack
+   of memory. That constitutes all of the standard failure cases.  */
+bool seen_hit;
+bool seen_miss;
+bool seen_oom;
+
+/* How many errors we've had while running the test.  */
+int errors;
 
 static void
 check (uid_t uid)
 {
+  int ret;
   char buf[1024];
 
-  (void) getpw (uid, buf);
+  ret = getpw (uid, buf);
+
+  /* Successfully read a password line.  */
+  if (ret == 0 && !seen_hit)
+    {
+      printf ("PASS: Read a password line given a uid.\n");
+      seen_hit = true;
+    }
+
+  /* Failed to read a password line. Why?  */
+  if (ret == -1)
+    {
+      /* No entry?  Technically the errno could be any number
+	 of values including ESRCH, EBADP or EPERM depending
+	 on the quality of the nss module that implements the
+	 underlying lookup. It should be 0 for getpw.*/
+      if (errno == 0 && !seen_miss)
+	{
+	  printf ("PASS: Found an invalid uid.\n");
+	  seen_miss = true;
+	  return;
+	}
+
+      /* Out of memory?  */
+      if (errno == ENOMEM && !seen_oom)
+	{
+	  printf ("FAIL: Failed with ENOMEM.\n");
+	  seen_oom = true;
+	  errors++;
+	}
+
+      /* We don't expect any other values for errno.  */
+      if (errno != ENOMEM && errno != 0)
+	errors++;
+    }
 }
 
 static int
 do_test (void)
 {
+  int ret;
   uid_t uid;
 
-  /* Just call it a different number of times the range should be
-     large enough to find some existing and some non existing uids.  */
+  /* Should return -1 and set errnot to EINVAL.  */
+  ret = getpw (0, NULL);
+  if (ret == -1 && errno == EINVAL)
+    {
+      printf ("PASS: NULL buffer returns -1 and sets errno to EINVAL.\n");
+    }
+  else
+    {
+      printf ("FAIL: NULL buffer did not return -1 or set errno to EINVAL.\n");
+      errors++;
+    }
+
+  /* Look for one matching uid, one non-found uid and then stop.
+     Set an upper limit at the 16-bit UID mark; no need to go farther.  */
+  for (uid = 0; uid < ((uid_t) 65535); ++uid)
+    {
+      check (uid);
+      if (seen_miss && seen_hit)
+	break;
+    }
+
+  if (!seen_hit)
+    printf ("FAIL: Did not read even one password line given a uid.\n");
 
-  for (uid = 0; uid < 2000; ++uid)
-    check (uid);
+  if (!seen_miss)
+    printf ("FAIL: Did not find even one invalid uid.\n");
 
-  return 0;
+  return errors;
 }
 
 #define TEST_FUNCTION do_test ()