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Implement device type discovery using ioctl calls

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This commit implements device type discovery by calling two ioctls
(DRM_IOCTL_VERSION and EVIOCGVERSION) on the device. These iocts are
specific to drm and input devices respectively, therefore we can
determine the device type based on which one returns an error.
This commit is contained in:
sghctoma 2018-09-07 16:37:25 +02:00
parent bbeed1bd31
commit 7a5d3c4d3b
2 changed files with 15 additions and 29 deletions
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10
backend/session/direct-ipc.c
View file

@ -3,6 +3,7 @@
#define __BSD_VISIBLE 1
#define INPUT_MAJOR 0
#endif
#include <dev/evdev/input.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
@ -159,14 +160,15 @@ static void communicate(int sock) {
ret = errno;
}
#else
if (strncmp(msg.path, "/dev/drm/", 9) &&
strncmp(msg.path, "/dev/input/event", 16)) {
int ev;
struct drm_version dv = {0};
if (ioctl(fd, EVIOCGVERSION, &ev) == -1 &&
ioctl(fd, DRM_IOCTL_VERSION, &dv) == -1) {
ret = ENOTSUP;
goto error;
}
if (strncmp(msg.path, "/dev/drm/", 9) == 0 && drmSetMaster(fd)) {
if (dv.version_major != 0 && drmSetMaster(fd)) {
ret = errno;
}
#endif