Remove redundant pipe from pdeathsig.c test.

A pipe was was left over from a development version of pdeathsig.c and
is not needed.

Process C waits for a signal that'll be generated when process B
exists. Process B waits for process D to send it a byte via pipe_db
before it exits. Process D sends the byte after it has started
ptrace()ing process C. The point of the test is to show that process C
receives the signal because process B exited, even though C has been
reparented to process D. The pipe pipe_cd isn't doing anything useful
(though in an earlier version of the patch it did). Clean that up by
removing the useless pipe.

Submitted by:	Thomas Munro
MFC after:	6 days
Differential revision:	https://reviews.freebsd.org/D15214

1 files changed, 0 insertions, 7 deletions

diff --git a/tests/sys/kern/pdeathsig.c b/tests/sys/kern/pdeathsig.c
index a80dde5e4a9e..a69720dce0e2 100644
--- a/tests/sys/kern/pdeathsig.c
+++ b/tests/sys/kern/pdeathsig.c
@@ -229,7 +229,6 @@ ATF_TC_BODY(signal_delivered_ptrace, tc)
 	int rc;
 	int pipe_ca[2];
 	int pipe_db[2];
-	int pipe_cd[2];
 	char buffer;
 	int status;
 
@@ -237,8 +236,6 @@ ATF_TC_BODY(signal_delivered_ptrace, tc)
 	ATF_REQUIRE(rc == 0);
 	rc = pipe(pipe_db);
 	ATF_REQUIRE(rc == 0);
-	rc = pipe(pipe_cd);
-	ATF_REQUIRE(rc == 0);
 
 	rc = fork();
 	ATF_REQUIRE(rc != -1);
@@ -266,10 +263,6 @@ ATF_TC_BODY(signal_delivered_ptrace, tc)
 			rc = procctl(P_PID, 0, PROC_PDEATHSIG_CTL, &signum);
 			assert(rc == 0);
 
-			/* tell D we are ready for it to attach */
-			rc = write(pipe_cd[1], ".", 1);
-			assert(rc == 1);
-
 			/* wait for B to die and signal us... */
 			signum = 0xdeadbeef;
 			rc = sigwait(&sigset, &signum);