[PATCH lttng-tools 3/6] Fix: utils.sh: handle SIGPIPE

[Mathieu Desnoyers <mathieu.desnoyers@efficios.com>]

perl prove closes its child pipes before giving it a chance to execute
the signal trap handler. This means the child will not be able to
complete execution of the trap handler if that handler writes to stdout
or stderr.

Work-around this situation by redirecting stdin, stdout, and stderr
to /dev/null if a SIGPIPE is caught.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---
 tests/utils/utils.sh | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tests/utils/utils.sh b/tests/utils/utils.sh
index 8f6381eb..53964027 100644
--- a/tests/utils/utils.sh
+++ b/tests/utils/utils.sh
@@ -68,9 +68,21 @@ function full_cleanup ()
 	trap - SIGTERM && kill -- -$$
 }
 
+function null_pipes ()
+{
+	exec 0>/dev/null
+	exec 1>/dev/null
+	exec 2>/dev/null
+}
 
 trap full_cleanup SIGINT SIGTERM
 
+# perl prove closes its child pipes before giving it a chance to run its
+# signal trap handlers. Redirect pipes to /dev/null if SIGPIPE is caught
+# to allow those trap handlers to proceed.
+
+trap null_pipes SIGPIPE
+
 function print_ok ()
 {
 	# Check if we are a terminal
-- 
2.17.1