linux-user: Add support for selecting alsa timer using ioctl

This patch implements functionality of following ioctl:

SNDRV_TIMER_IOCTL_SELECT - Selecting timer

    Selects the timer which id is specified. The timer id is specified in the
    following strcuture:

    struct snd_timer_select {
        struct snd_timer_id id;         /* timer ID */
        unsigned char reserved[32];     /* reserved */
    };

    A pointer to this structure should be passed as the third ioctl's argument.
    Before calling the ioctl, the field "tid" should be initialized with the id
    information for the timer which is to be selected. If there is no timer
    device with the specified id, the error ENODEV ("No such device") is
    returned.

Implementation notes:

    Ioctl implemented in this patch has a pointer to a
    'struct snd_timer_select' as its third argument.
    That is the reason why a corresponding definition
    was added in 'linux-user/syscall_types.h'. The rest
    of the implementation was straightforward.

Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Filip Bozuta <Filip.Bozuta@rt-rk.com>
Message-Id: <1579117007-7565-11-git-send-email-Filip.Bozuta@rt-rk.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

1 files changed, 4 insertions, 0 deletions

diff --git a/linux-user/syscall_types.h b/linux-user/syscall_types.h
index adcfa28..81bc719 100644
--- a/linux-user/syscall_types.h
+++ b/linux-user/syscall_types.h
@@ -116,6 +116,10 @@ STRUCT(snd_timer_gstatus,
        TYPE_ULONG, /* resolution_den */
        MK_ARRAY(TYPE_CHAR, 32)) /* reserved */
 
+STRUCT(snd_timer_select,
+       MK_STRUCT(STRUCT_snd_timer_id), /* id */
+       MK_ARRAY(TYPE_CHAR, 32)) /* reserved */
+
 /* loop device ioctls */
 STRUCT(loop_info,
        TYPE_INT,                 /* lo_number */