Like the comment suggested, we just open the file and pass the file
descriptor to uml. The input "stream" is set to "null", since I couldn't
find any useful way to actually use a file for input for a chardev and
this also mimics what e.g. QEmu does internally.
Signed-off-by: Soren Hansen <soren@xxxxxxxxxxx>
---
src/uml/uml_conf.c | 31 ++++++++++++++++++++++++++-----
src/uml/uml_conf.h | 1 +
src/uml/uml_driver.c | 12 +++++++++++-
3 files changed, 38 insertions(+), 6 deletions(-)
diff --git a/src/uml/uml_conf.c b/src/uml/uml_conf.c
index 42193e4..65b06c5 100644
--- a/src/uml/uml_conf.c
+++ b/src/uml/uml_conf.c
@@ -295,7 +295,8 @@ error:
static char *
umlBuildCommandLineChr(virDomainChrDefPtr def,
- const char *dev)
+ const char *dev,
+ fd_set *keepfd)
{
char *ret = NULL;
@@ -344,8 +345,27 @@ umlBuildCommandLineChr(virDomainChrDefPtr def,
break;
case VIR_DOMAIN_CHR_TYPE_FILE:
- case VIR_DOMAIN_CHR_TYPE_PIPE:
- /* XXX could open the file/pipe & just pass the FDs */
+ {
+ int fd_out;
+
+ if ((fd_out = open(def->data.file.path,
+ O_WRONLY | O_APPEND | O_CREAT, 0660)) < 0) {
+ virReportSystemError(errno,
+ _("failed to open chardev file: %s"),
+ def->data.file.path);
+ return NULL;
+ }
+ if (virAsprintf(&ret, "%s%d=null,fd:%d", dev, def->target.port, fd_out) < 0) {
+ virReportOOMError();
+ close(fd_out);
+ return NULL;
+ }
+ FD_SET(fd_out, keepfd);
+ }
+ break;
+ case VIR_DOMAIN_CHR_TYPE_PIPE:
+ /* XXX could open the pipe & just pass the FDs. Be wary of
+ * the effects of blocking I/O, though. */
case VIR_DOMAIN_CHR_TYPE_VC:
case VIR_DOMAIN_CHR_TYPE_UDP:
@@ -391,6 +411,7 @@ static char *umlNextArg(char *args)
int umlBuildCommandLine(virConnectPtr conn,
struct uml_driver *driver ATTRIBUTE_UNUSED,
virDomainObjPtr vm,
+ fd_set *keepfd,
const char ***retargv,
const char ***retenv)
{
@@ -513,7 +534,7 @@ int umlBuildCommandLine(virConnectPtr conn,
for (i = 0 ; i < UML_MAX_CHAR_DEVICE ; i++) {
char *ret = NULL;
if (i == 0 && vm->def->console)
- ret = umlBuildCommandLineChr(vm->def->console, "con");
+ ret = umlBuildCommandLineChr(vm->def->console, "con", keepfd);
if (!ret)
if (virAsprintf(&ret, "con%d=none", i) < 0)
goto no_memory;
@@ -527,7 +548,7 @@ int umlBuildCommandLine(virConnectPtr conn,
if (vm->def->serials[j]->target.port == i)
chr = vm->def->serials[j];
if (chr)
- ret = umlBuildCommandLineChr(chr, "ssl");
+ ret = umlBuildCommandLineChr(chr, "ssl", keepfd);
if (!ret)
if (virAsprintf(&ret, "ssl%d=none", i) < 0)
goto no_memory;
diff --git a/src/uml/uml_conf.h b/src/uml/uml_conf.h
index b33acc8..d8b2349 100644
--- a/src/uml/uml_conf.h
+++ b/src/uml/uml_conf.h
@@ -71,6 +71,7 @@ virCapsPtr umlCapsInit (void);
int umlBuildCommandLine (virConnectPtr conn,
struct uml_driver *driver,
virDomainObjPtr dom,
+ fd_set *keepfd,
const char ***retargv,
const char ***retenv);
diff --git a/src/uml/uml_driver.c b/src/uml/uml_driver.c
index 9cad7f1..e926a9f 100644
--- a/src/uml/uml_driver.c
+++ b/src/uml/uml_driver.c
@@ -811,6 +811,7 @@ static int umlStartVMDaemon(virConnectPtr conn,
char *logfile;
int logfd = -1;
struct stat sb;
+ int openmax;
fd_set keepfd;
char ebuf[1024];
umlDomainObjPrivatePtr priv = vm->privateData;
@@ -869,7 +870,7 @@ static int umlStartVMDaemon(virConnectPtr conn,
return -1;
}
- if (umlBuildCommandLine(conn, driver, vm,
+ if (umlBuildCommandLine(conn, driver, vm, &keepfd,
&argv, &progenv) < 0) {
close(logfd);
umlCleanupTapDevices(conn, vm);
@@ -908,6 +909,15 @@ static int umlStartVMDaemon(virConnectPtr conn,
NULL, NULL, NULL);
close(logfd);
+ /*
+ * At the moment, the only thing that populates keepfd is
+ * umlBuildCommandLineChr. We want to close every fd it opens.
+ */
+ openmax = sysconf (_SC_OPEN_MAX);
+ for (i = 0; i < openmax; i++)
+ if (FD_ISSET(i, &keepfd))
+ close(i);
+
for (i = 0 ; argv[i] ; i++)
VIR_FREE(argv[i]);
VIR_FREE(argv);
--
1.7.0.4
--
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