dio_sparse: prevent race between kill and signal

This is same change as in:
commit d8f1292181b486b2073cc6fe1ec226f5cedea342
Author: Cyril Hrubis <[email protected]>
Date: Fri Mar 2 13:37:47 2012 +0100
ltp-aiodio: aiodio_sparse fix race condition

but for dio_sparse.c, which is also prone to race
between kill() and signal().

---
 testcases/kernel/io/ltp-aiodio/dio_sparse.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

index e93dcd9..97dbef8 100644
@@ -149,10 +149,10 @@ int main(int argc, char **argv)
 	dirty_freeblocks(filesize);
 
 	tst_resm(TINFO, "Starting I/O tests");
+	signal(SIGTERM, SIG_DFL);
 	for (i = 0; i < num_children; i++) {
 		switch (pid[i] = fork()) {
 		case 0:
-			signal(SIGTERM, SIG_DFL);
 			read_sparse(filename, filesize);
 		break;
 		case -1:

@@ -164,6 +164,7 @@ int main(int argc, char **argv)
 			continue;
 		}
 	}
+	tst_sig(FORK, DEF_HANDLER, cleanup);
 	
 	ret = dio_sparse(filename, alignment, writesize, filesize);
 

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Hi!

Commited, thanks.

Cyril Hrubis
[email protected]

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Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
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