[V4,22/25] chardev: cpr for pty

Commit Message

Steven Sistare July 6, 2021, 4:45 p.m. UTC

Save and restore pty descriptors across cprsave and cprload.

Signed-off-by: Steve Sistare <[e-mail]>
---
 chardev/char-pty.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

Patch

diff --git a/chardev/char-pty.c b/chardev/char-pty.c
index a2d1e7c..c91151d 100644
--- a/chardev/char-pty.c
+++ b/chardev/char-pty.c
@@ -30,6 +30,7 @@ 
 #include "qemu/sockets.h"
 #include "qemu/error-report.h"
 #include "qemu/module.h"
+#include "qemu/env.h"
 #include "qemu/qemu-print.h"
 
 #include "chardev/char-io.h"
@@ -191,6 +192,7 @@  static void char_pty_finalize(Object *obj)
     Chardev *chr = CHARDEV(obj);
     PtyChardev *s = PTY_CHARDEV(obj);
 
+    unsetenv_fd(chr->label);
     pty_chr_state(chr, 0);
     object_unref(OBJECT(s->ioc));
     pty_chr_timer_cancel(s);
@@ -207,19 +209,28 @@  static void char_pty_open(Chardev *chr,
     char pty_name[PATH_MAX];
     char *name;
 
+    master_fd = getenv_fd(chr->label);
+    if (master_fd >= 0) {
+        chr->filename = g_strdup_printf("pty:unknown");
+        goto have_fd;
+    }
+
     master_fd = qemu_openpty_raw(&slave_fd, pty_name);
     if (master_fd < 0) {
         error_setg_errno(errp, errno, "Failed to create PTY");
         return;
     }
-
+    if (!chr->close_on_cpr) {
+        setenv_fd(chr->label, master_fd);
+    }
     close(slave_fd);
     qemu_set_nonblock(master_fd);
-
     chr->filename = g_strdup_printf("pty:%s", pty_name);
     qemu_printf("char device redirected to %s (label %s)\n",
                 pty_name, chr->label);
 
+have_fd:
+    qemu_chr_set_feature(chr, QEMU_CHAR_FEATURE_CPR);
     s = PTY_CHARDEV(chr);
     s->ioc = QIO_CHANNEL(qio_channel_file_new_fd(master_fd));
     name = g_strdup_printf("chardev-pty-%s", chr->label);