Author: kib
Date: Fri Apr 27 16:34:28 2018
New Revision: 333067
URL: https://svnweb.freebsd.org/changeset/base/333067

Log:
  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

Modified:
  head/tests/sys/kern/pdeathsig.c

Modified: head/tests/sys/kern/pdeathsig.c
==============================================================================
--- head/tests/sys/kern/pdeathsig.c     Fri Apr 27 15:50:22 2018        
(r333066)
+++ head/tests/sys/kern/pdeathsig.c     Fri Apr 27 16:34:28 2018        
(r333067)
@@ -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);
@@ -265,10 +262,6 @@ ATF_TC_BODY(signal_delivered_ptrace, tc)
                        /* request a signal on parent death and register a 
handler */
                        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;
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