allow disabling of serial or parallel devices (Stefan Weil)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2141 c046a42c-6fe2-441c-8c8c-71466251a162

2 files changed, 16 insertions, 8 deletions

diff --git a/qemu-doc.texi b/qemu-doc.texi
index 3bf3b5cd9c..144381ff99 100644
--- a/qemu-doc.texi
+++ b/qemu-doc.texi
@@ -506,12 +506,16 @@ Redirect the virtual serial port to host character device
 This option can be used several times to simulate up to 4 serials
 ports.
 
+Use @code{-serial none} to disable all serial ports.
+
 Available character devices are:
 @table @code
 @item vc
 Virtual console
 @item pty
 [Linux only] Pseudo TTY (a new PTY is automatically allocated)
+@item none
+No device is allocated.
 @item null
 void device
 @item /dev/XXX
@@ -593,6 +597,8 @@ parallel port.
 This option can be used several times to simulate up to 3 parallel
 ports.
 
+Use @code{-parallel none} to disable all parallel ports.
+
 @item -monitor dev
 Redirect the monitor to host device @var{dev} (same devices as the
 serial port).
diff --git a/vl.c b/vl.c
index 32c994366c..cdfd98c557 100644
--- a/vl.c
+++ b/vl.c
@@ -6850,27 +6850,29 @@ int main(int argc, char **argv)
     monitor_init(monitor_hd, !nographic);
 
     for(i = 0; i < MAX_SERIAL_PORTS; i++) {
-        if (serial_devices[i][0] != '\0') {
-            serial_hds[i] = qemu_chr_open(serial_devices[i]);
+        const char *devname = serial_devices[i];
+        if (devname[0] != '\0' && strcmp(devname, "none")) {
+            serial_hds[i] = qemu_chr_open(devname);
             if (!serial_hds[i]) {
                 fprintf(stderr, "qemu: could not open serial device '%s'\n", 
-                        serial_devices[i]);
+                        devname);
                 exit(1);
             }
-            if (!strcmp(serial_devices[i], "vc"))
+            if (!strcmp(devname, "vc"))
                 qemu_chr_printf(serial_hds[i], "serial%d console\r\n", i);
         }
     }
 
     for(i = 0; i < MAX_PARALLEL_PORTS; i++) {
-        if (parallel_devices[i][0] != '\0') {
-            parallel_hds[i] = qemu_chr_open(parallel_devices[i]);
+        const char *devname = parallel_devices[i];
+        if (devname[0] != '\0' && strcmp(devname, "none")) {
+            parallel_hds[i] = qemu_chr_open(devname);
             if (!parallel_hds[i]) {
                 fprintf(stderr, "qemu: could not open parallel device '%s'\n", 
-                        parallel_devices[i]);
+                        devname);
                 exit(1);
             }
-            if (!strcmp(parallel_devices[i], "vc"))
+            if (!strcmp(devname, "vc"))
                 qemu_chr_printf(parallel_hds[i], "parallel%d console\r\n", i);
         }
     }