[libvirt] [PATCH 2/2] virCommandFree: Set pointer to NULL

[Michal Privoznik]

Just like we have VIR_FREE() which sets pointer to NULL,
we should have virCommandFree() to act the same.

Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
 src/fdstream.c                        |  1 -
 src/libvirt_private.syms              |  2 +-
 src/qemu/qemu_driver.c                |  1 -
 src/storage/storage_backend_logical.c |  3 ---
 src/util/vircommand.c                 | 11 ++++++++---
 src/util/vircommand.h                 |  4 +++-
 src/util/virnetdevveth.c              |  1 -
 7 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/src/fdstream.c b/src/fdstream.c
index f7dae39..4acb821 100644
--- a/src/fdstream.c
+++ b/src/fdstream.c
@@ -321,7 +321,6 @@ virFDStreamCloseInt(virStreamPtr st, bool streamAbort)
             ret = -1;
         }
         virCommandFree(fdst->cmd);
-        fdst->cmd = NULL;
     }
 
     if (VIR_CLOSE(fdst->errfd) < 0)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 25beda2..1ecef26 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1065,7 +1065,7 @@ virCommandClearCaps;
 virCommandDaemonize;
 virCommandDoAsyncIO;
 virCommandExec;
-virCommandFree;
+virCommandFreeInternal;
 virCommandHandshakeNotify;
 virCommandHandshakeWait;
 virCommandNew;
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 9c3daad..688c535 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -11605,7 +11605,6 @@ qemuDomainSnapshotCreateInactiveExternal(virQEMUDriverPtr driver,
             goto cleanup;
 
         virCommandFree(cmd);
-        cmd = NULL;
     }
 
     /* update disk definitions */
diff --git a/src/storage/storage_backend_logical.c b/src/storage/storage_backend_logical.c
index 10966cc..ddeec29 100644
--- a/src/storage/storage_backend_logical.c
+++ b/src/storage/storage_backend_logical.c
@@ -644,7 +644,6 @@ virStorageBackendLogicalDeletePool(virConnectPtr conn ATTRIBUTE_UNUSED,
     if (virCommandRun(cmd, NULL) < 0)
         goto cleanup;
     virCommandFree(cmd);
-    cmd = NULL;
 
     /* now remove the pv devices and clear them out */
     ret = 0;
@@ -657,7 +656,6 @@ virStorageBackendLogicalDeletePool(virConnectPtr conn ATTRIBUTE_UNUSED,
             break;
         }
         virCommandFree(cmd);
-        cmd = NULL;
     }
 
 cleanup:
@@ -720,7 +718,6 @@ virStorageBackendLogicalCreateVol(virConnectPtr conn,
         goto error;
 
     virCommandFree(cmd);
-    cmd = NULL;
 
     if ((fd = virStorageBackendVolOpen(vol->target.path)) < 0)
         goto error;
diff --git a/src/util/vircommand.c b/src/util/vircommand.c
index 8dcf9e7..2f8c534 100644
--- a/src/util/vircommand.c
+++ b/src/util/vircommand.c
@@ -2561,7 +2561,7 @@ int virCommandHandshakeNotify(virCommandPtr cmd)
 
 
 /**
- * virCommandFree:
+ * virCommandFreeInternal:
  * @cmd: optional command to free
  *
  * Release all resources.  The only exception is that if you called
@@ -2569,12 +2569,16 @@ int virCommandHandshakeNotify(virCommandPtr cmd)
  * is not reaped, and you must call virProcessWait() or virProcessAbort() yourself.
  */
 void
-virCommandFree(virCommandPtr cmd)
+virCommandFreeInternal(virCommandPtr *ptr)
 {
+    virCommandPtr cmd;
     size_t i;
-    if (!cmd)
+
+    if (!ptr || !*ptr)
         return;
 
+    cmd = *ptr;
+
     for (i = 0; i < cmd->npassfd; i++) {
         if (cmd->passfd[i].flags & VIR_COMMAND_PASS_FD_CLOSE_PARENT)
             VIR_FORCE_CLOSE(cmd->passfd[i].fd);
@@ -2621,6 +2625,7 @@ virCommandFree(virCommandPtr cmd)
 #endif
 
     VIR_FREE(cmd);
+    *ptr = NULL;
 }
 
 /**
diff --git a/src/util/vircommand.h b/src/util/vircommand.h
index e977f93..ce7e9ab 100644
--- a/src/util/vircommand.h
+++ b/src/util/vircommand.h
@@ -181,7 +181,9 @@ int virCommandHandshakeNotify(virCommandPtr cmd)
 
 void virCommandAbort(virCommandPtr cmd);
 
-void virCommandFree(virCommandPtr cmd);
+# define virCommandFree(ptr) \
+    virCommandFreeInternal(&(ptr))
+void virCommandFreeInternal(virCommandPtr *cmd);
 
 void virCommandDoAsyncIO(virCommandPtr cmd);
 #endif /* __VIR_COMMAND_H__ */
diff --git a/src/util/virnetdevveth.c b/src/util/virnetdevveth.c
index 25eb282..737563f 100644
--- a/src/util/virnetdevveth.c
+++ b/src/util/virnetdevveth.c
@@ -171,7 +171,6 @@ int virNetDevVethCreate(char** veth1, char** veth2)
         VIR_FREE(veth1auto);
         VIR_FREE(veth2auto);
         virCommandFree(cmd);
-        cmd = NULL;
     }
 
     virReportError(VIR_ERR_INTERNAL_ERROR,
-- 
1.8.1.5