[libvirt] [PATCH] util: avoid fds leak on virEventPollInit

[ajia at redhat.com]

* src/util/event_poll.c: fix file descriptors leak on virEventPollInit.

Detected in valgrind run:
==1254==
==1254== FILE DESCRIPTORS: 6 open at exit.
==1254== Open file descriptor 5:
==1254==    at 0x30736D9D47: pipe2 (syscall-template.S:82)
==1254==    by 0x4DD6267: rpl_pipe2 (pipe2.c:61)
==1254==    by 0x4C4C1C5: virEventPollInit (event_poll.c:648)
==1254==    by 0x4C4AA94: virEventRegisterDefaultImpl (event.c:208)
==1254==    by 0x42150C: main (virsh.c:13790)
==1254==
==1254== Open file descriptor 4:
==1254==    at 0x30736D9D47: pipe2 (syscall-template.S:82)
==1254==    by 0x4DD6267: rpl_pipe2 (pipe2.c:61)
==1254==    by 0x4C4C1C5: virEventPollInit (event_poll.c:648)
==1254==    by 0x4C4AA94: virEventRegisterDefaultImpl (event.c:208)
==1254==    by 0x42150C: main (virsh.c:13790)
==1254==

* how to reproduce?
  % valgrind -v --track-fds=yes virsh list 

---
 src/util/event_poll.c |   13 ++++++++++---
 1 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/src/util/event_poll.c b/src/util/event_poll.c
index 285ba50..1e4ef96 100644
--- a/src/util/event_poll.c
+++ b/src/util/event_poll.c
@@ -639,6 +639,8 @@ static void virEventPollHandleWakeup(int watch ATTRIBUTE_UNUSED,
 
 int virEventPollInit(void)
 {
+    int ret = -1;
+
     if (virMutexInit(&eventLoop.lock) < 0) {
         virReportSystemError(errno, "%s",
                              _("Unable to initialize mutex"));
@@ -648,7 +650,7 @@ int virEventPollInit(void)
     if (pipe2(eventLoop.wakeupfd, O_CLOEXEC | O_NONBLOCK) < 0) {
         virReportSystemError(errno, "%s",
                              _("Unable to setup wakeup pipe"));
-        return -1;
+        goto cleanup;
     }
 
     if (virEventPollAddHandle(eventLoop.wakeupfd[0],
@@ -657,10 +659,15 @@ int virEventPollInit(void)
         virEventError(VIR_ERR_INTERNAL_ERROR,
                       _("Unable to add handle %d to event loop"),
                       eventLoop.wakeupfd[0]);
-        return -1;
+        goto cleanup;
     }
 
-    return 0;
+    ret = 0;
+
+cleanup:
+    close(eventLoop.wakeupfd[0]);
+    close(eventLoop.wakeupfd[1]);
+    return ret;
 }
 
 static int virEventPollInterruptLocked(void)
-- 
1.7.1