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Allow chardev of type 'file' for UML domains.

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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@linux2go.dk>
This commit is contained in:
Soren Hansen 2010-08-23 13:25:50 +02:00 committed by Matthias Bolte
parent 8c48743b97
commit 21dcce5364
3 changed files with 36 additions and 6 deletions
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29
src/uml/uml_conf.c
View File

@ -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:
{
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 file/pipe & just pass the FDs */
/* 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;

1
src/uml/uml_conf.h
View File

@ -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);

10
src/uml/uml_driver.c
View File

@ -869,7 +869,7 @@ 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 +908,14 @@ 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.
*/
for (i = 0; i < FD_SETSIZE; i++)
if (FD_ISSET(i, &keepfd))
close(i);
for (i = 0 ; argv[i] ; i++)
VIR_FREE(argv[i]);
VIR_FREE(argv);