[libvirt] [PATCH 06/20] qemu_capabilities: Stop QEMU process before freeing

[Jiri Denemark]

From: Chris Venteicher <cventeic at redhat.com>

virQEMUCapsInitQMP now stops QEMU process in all execution paths,
before freeing the process structure.

The qemuProcessQMPStop function can be called multiple times without
problems... Won't attempt to stop processes and free resources multiple
times.

Follow the convention established in qemu_process of
1) alloc process structure
2) start process
3) use process
4) stop process
5) free process data structure

The process data structure persists after the process activation fails
or the process dies or is killed so stderr strings can be retrieved
until the process data structure is freed.

Signed-off-by: Chris Venteicher <cventeic at redhat.com>
Reviewed-by: Jiri Denemark <jdenemar at redhat.com>
Signed-off-by: Jiri Denemark <jdenemar at redhat.com>
---

Notes:
    Version 7:
    - no change

 src/qemu/qemu_capabilities.c |  1 +
 src/qemu/qemu_process.c      | 24 ++++++++++++++++--------
 2 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index d187e35a38..f578d4a5ae 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -4393,6 +4393,7 @@ virQEMUCapsInitQMP(virQEMUCapsPtr qemuCaps,
     ret = 0;
 
  cleanup:
+    qemuProcessQMPStop(proc);
     qemuProcessQMPFree(proc);
     return ret;
 }
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index d463a41ca0..4ae2067782 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -8488,14 +8488,20 @@ qemuProcessQMPRun(qemuProcessQMPPtr proc,
 void
 qemuProcessQMPStop(qemuProcessQMPPtr proc)
 {
-    if (proc->mon)
-        virObjectUnlock(proc->mon);
-    qemuMonitorClose(proc->mon);
-    proc->mon = NULL;
+    if (!proc)
+        return;
 
-    virCommandAbort(proc->cmd);
-    virCommandFree(proc->cmd);
-    proc->cmd = NULL;
+    if (proc->mon) {
+        virObjectUnlock(proc->mon);
+        qemuMonitorClose(proc->mon);
+        proc->mon = NULL;
+    }
+
+    if (proc->cmd) {
+        virCommandAbort(proc->cmd);
+        virCommandFree(proc->cmd);
+        proc->cmd = NULL;
+    }
 
     if (proc->monpath)
         unlink(proc->monpath);
@@ -8512,8 +8518,10 @@ qemuProcessQMPStop(qemuProcessQMPPtr proc)
                       virStrerror(errno, ebuf, sizeof(ebuf)));
 
         VIR_FREE(*proc->qmperr);
+
+        proc->pid = 0;
     }
+
     if (proc->pidfile)
         unlink(proc->pidfile);
-    proc->pid = 0;
 }
-- 
2.20.1