[LTP] [PATCH] pidns17 testcase bugfix/cleanup

[Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>]

Fix minor bugs in the test case that cause the test to fail intermittently.
Also, print more debug info when test fails.

This fixes a bug reported by Sachin P. Sant.

Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
---
 testcases/kernel/containers/pidns/pidns17.c |   17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

Index: ltp-full-20090331/testcases/kernel/containers/pidns/pidns17.c
===================================================================
--- ltp-full-20090331.orig/testcases/kernel/containers/pidns/pidns17.c	2009-06-10 23:52:44.022094621 -0700
+++ ltp-full-20090331/testcases/kernel/containers/pidns/pidns17.c	2009-06-11 00:09:37.454753439 -0700
@@ -74,8 +74,10 @@ int child_fn(void *arg)
 
 	/* Spawn many children */
 	for (i = 0; i < 10; i++)
-		if ((children[i] = fork()) == 0)
-			sleep(10);
+		if ((children[i] = fork()) == 0) {
+			pause();
+			exit(2);
+		}
 
 	/* wait for last child to get scheduled */
 	sleep(1);
@@ -86,13 +88,16 @@ int child_fn(void *arg)
 	}
 
 	for (i = 0; i < 10; i++) {
-		if (waitpid(children[i], &status, WNOHANG) == -1) {
+		if (waitpid(children[i], &status, 0) == -1) {
 			tst_resm(TBROK, "cinit: waitpid() failed(%s)",\
 					strerror(errno));
 			cleanup();
 		}
-		if (!(WIFSIGNALED(&status) && WTERMSIG(status) == SIGUSR1)) {
-			tst_resm(TFAIL, "cinit: found a child alive still.");
+		if (!(WIFSIGNALED(status) && WTERMSIG(status) == SIGUSR1)) {
+			tst_resm(TFAIL, "cinit: found a child alive still "
+					"%d exit: %d, %d, signal %d, %d", i,
+					WIFEXITED(status), WEXITSTATUS(status),
+					WIFSIGNALED(status), WTERMSIG(status));
 			cleanup();
 		}
 	}
@@ -125,7 +130,7 @@ int main(int argc, char *argv[])
 	}
 
 	sleep(1);
-	if (wait(&status) < 0)
+	if (waitpid(-1, &status, __WALL) < 0)
 		tst_resm(TWARN, "parent: waitpid() failed.");
 
 	if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)

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