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Add chardev API qemu_chr_fe_set_msgfds

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This will set an array of file descriptors to the internal structures.
The next time a message is send the array will be send as ancillary
data. This feature works on the UNIX domain socket backend only.

Signed-off-by: Antonios Motakis <a.motakis@virtualopensystems.com>
Signed-off-by: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Nikolay Nikolaev 2014-05-27 15:04:02 +03:00 • committed by Michael S. Tsirkin
parent 7b0bfdf52d
commit d39aac7aac
2 changed files with 101 additions and 1 deletions
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14
include/sysemu/char.h
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@ -62,6 +62,7 @@ struct CharDriverState {
void (*chr_update_read_handler)(struct CharDriverState *s);
int (*chr_ioctl)(struct CharDriverState *s, int cmd, void *arg);
int (*get_msgfd)(struct CharDriverState *s);
int (*set_msgfds)(struct CharDriverState *s, int *fds, int num);
int (*chr_add_client)(struct CharDriverState *chr, int fd);
IOEventHandler *chr_event;
IOCanReadHandler *chr_can_read;
@ -228,6 +229,19 @@ int qemu_chr_fe_ioctl(CharDriverState *s, int cmd, void *arg);
*/
int qemu_chr_fe_get_msgfd(CharDriverState *s);
/**
* @qemu_chr_fe_set_msgfds:
*
* For backends capable of fd passing, set an array of fds to be passed with
* the next send operation.
* A subsequent call to this function before calling a write function will
* result in overwriting the fd array with the new value without being send.
* Upon writing the message the fd array is freed.
*
* Returns: -1 if fd passing isn't supported.
*/
int qemu_chr_fe_set_msgfds(CharDriverState *s, int *fds, int num);
/**
* @qemu_chr_fe_claim:
*