[libvirt] [PATCH 3/8] lxc: don't build pidfile string multiple times

[Daniel P. Berrange]

Build the pidfile string once when starting a guest and then
use the same string thereafter. This will benefit following
patches which need the pidfile string in more situations.

Signed-off-by: Daniel P. Berrange <berrange at redhat.com>
---
 src/lxc/lxc_process.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/src/lxc/lxc_process.c b/src/lxc/lxc_process.c
index 89e9249..6bdfe3d 100644
--- a/src/lxc/lxc_process.c
+++ b/src/lxc/lxc_process.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2010-2014 Red Hat, Inc.
+ * Copyright (C) 2010-2015 Red Hat, Inc.
  * Copyright IBM Corp. 2008
  *
  * lxc_process.c: LXC process lifecycle management
@@ -1015,6 +1015,7 @@ int virLXCProcessStart(virConnectPtr conn,
     virLXCDriverConfigPtr cfg = virLXCDriverGetConfig(driver);
     virCgroupPtr selfcgroup;
     int status;
+    char *pidfile = NULL;
 
     if (virCgroupNewSelf(&selfcgroup) < 0)
         return -1;
@@ -1065,7 +1066,10 @@ int virLXCProcessStart(virConnectPtr conn,
 
     if (virAsprintf(&logfile, "%s/%s.log",
                     cfg->logDir, vm->def->name) < 0)
-        return -1;
+        goto cleanup;
+
+    if (!(pidfile = virPidFileBuildPath(cfg->stateDir, vm->def->name)))
+        goto cleanup;
 
     if (!(caps = virLXCDriverGetCapabilities(driver, false)))
         goto cleanup;
@@ -1263,14 +1267,14 @@ int virLXCProcessStart(virConnectPtr conn,
     }
 
     /* And get its pid */
-    if ((r = virPidFileRead(cfg->stateDir, vm->def->name, &vm->pid)) < 0) {
+    if ((r = virPidFileReadPath(pidfile, &vm->pid)) < 0) {
         if (virLXCProcessReadLogOutput(vm, logfile, pos, ebuf, sizeof(ebuf)) > 0)
             virReportError(VIR_ERR_INTERNAL_ERROR,
                            _("guest failed to start: %s"), ebuf);
         else
             virReportSystemError(-r,
-                                 _("Failed to read pid file %s/%s.pid"),
-                                 cfg->stateDir, vm->def->name);
+                                 _("Failed to read pid file %s"),
+                                 pidfile);
         goto cleanup;
     }
 
@@ -1389,6 +1393,7 @@ int virLXCProcessStart(virConnectPtr conn,
     VIR_FREE(ttyFDs);
     VIR_FORCE_CLOSE(handshakefds[0]);
     VIR_FORCE_CLOSE(handshakefds[1]);
+    VIR_FREE(pidfile);
     VIR_FREE(logfile);
     virObjectUnref(cfg);
     virObjectUnref(caps);
-- 
2.1.0