Add SCM_RIGHTS support to unix socket character devices

If a file descriptor is passed via a message with SCM_RIGHTS ancillary
data on a unix socket, store the file descriptor for use in the
chr_read() handler. Close the file descriptor if it was not used.

The qemu_chr_get_msgfd() API provides access to the passed descriptor.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/qemu-char.h b/qemu-char.h
index e1aa8dbafa..77d4edaae3 100644
--- a/qemu-char.h
+++ b/qemu-char.h
@@ -51,6 +51,7 @@ struct CharDriverState {
     int (*chr_write)(struct CharDriverState *s, const uint8_t *buf, int len);
     void (*chr_update_read_handler)(struct CharDriverState *s);
     int (*chr_ioctl)(struct CharDriverState *s, int cmd, void *arg);
+    int (*get_msgfd)(struct CharDriverState *s);
     IOEventHandler *chr_event;
     IOCanRWHandler *chr_can_read;
     IOReadHandler *chr_read;
@@ -81,6 +82,7 @@ void qemu_chr_reset(CharDriverState *s);
 void qemu_chr_initial_reset(void);
 int qemu_chr_can_read(CharDriverState *s);
 void qemu_chr_read(CharDriverState *s, uint8_t *buf, int len);
+int qemu_chr_get_msgfd(CharDriverState *s);
 void qemu_chr_accept_input(CharDriverState *s);
 void qemu_chr_info(Monitor *mon);