[Qemu-trivial] [PATCH v2] curses: don't initialize curses when qemu is daemonized

[Hitoshi Mitake <h.mitake@gmail.com>]

Current qemu initializes curses even if -daemonize option is
passed. This cause problem because shell prompt appears without
calling endwin().

This patch adds new function, is_daemonized(), to OS dependent
code. With this function, curses_display_init() can check that qemu is
daemonized or not. If daemonized, curses_display_init() isn't called
and the problem is avoided.

Of course, -daemonize && -curses doesn't make sense. Users shouldn't
pass the arguments at the same time. But the problem is very painful
because Ctrl-C cannot be delivered to the terminal.

Cc: Andrzej Zaborowski  <balrog@zabor.org>
Cc: Stefan Hajnoczi <stefanha@gmail.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>
Cc: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Hitoshi Mitake <h.mitake@gmail.com>
---

v2: is_daemonized() is now called in main(), not in curses_display_init()

8<---
 os-posix.c      |    5 +++++
 qemu-os-posix.h |    2 ++
 qemu-os-win32.h |    5 +++++
 vl.c            |    3 ++-
 4 files changed, 14 insertions(+), 1 deletions(-)

diff --git a/os-posix.c b/os-posix.c
index 79fa228..99c5343 100644
--- a/os-posix.c
+++ b/os-posix.c
@@ -360,3 +360,8 @@ int qemu_create_pidfile(const char *filename)
     /* keep pidfile open & locked forever */
     return 0;
 }
+
+int is_daemonized(void)
+{
+    return daemonize;
+}
diff --git a/qemu-os-posix.h b/qemu-os-posix.h
index 8e1149d..0b2b60a 100644
--- a/qemu-os-posix.h
+++ b/qemu-os-posix.h
@@ -46,4 +46,6 @@ typedef struct timeval qemu_timeval;
 typedef struct timespec qemu_timespec;
 int qemu_utimens(const char *path, const qemu_timespec *times);
 
+int is_daemonized(void);
+
 #endif
diff --git a/qemu-os-win32.h b/qemu-os-win32.h
index 753679b..08a6fa8 100644
--- a/qemu-os-win32.h
+++ b/qemu-os-win32.h
@@ -86,4 +86,9 @@ typedef struct {
 } qemu_timeval;
 int qemu_gettimeofday(qemu_timeval *tp);
 
+static inline int is_daemonized(void)
+{
+    return 0;
+}
+
 #endif
diff --git a/vl.c b/vl.c
index 7c577fa..463f39e 100644
--- a/vl.c
+++ b/vl.c
@@ -3657,7 +3657,8 @@ int main(int argc, char **argv, char **envp)
         break;
 #if defined(CONFIG_CURSES)
     case DT_CURSES:
-        curses_display_init(ds, full_screen);
+        if (!is_daemonized())
+	    curses_display_init(ds, full_screen);
         break;
 #endif
 #if defined(CONFIG_SDL)
-- 
1.7.5.1