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Make drmDropMaster() more reliable by checking for DRM master fds.

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This should fix the majority of EACCES permission denied errors
when attempting to drop the DRM master.
This commit is contained in:
Adam Lantos 2022-06-09 00:23:27 -07:00 committed by Cameron Gutman
parent 1b96b18bc0
commit 685136d98f
1 changed files with 15 additions and 6 deletions
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21
app/masterhook.c
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@ -35,14 +35,23 @@ struct stat64 g_DrmMasterStat;
// The DRM master FD created for SDL
int g_SdlDrmMasterFd = -1;
int drmIsMaster(int fd)
{
/* Detect master by attempting something that requires master.
* This method is available in Mesa DRM since Feb 2019.
*/
return drmAuthMagic(fd, 0) != -EACCES;
}
// This hook will handle legacy DRM rendering
int drmModeSetCrtc(int fd, uint32_t crtcId, uint32_t bufferId,
uint32_t x, uint32_t y, uint32_t *connectors, int count,
drmModeModeInfoPtr mode)
{
// Grab the first DRM FD that makes it in here. This will be the Qt
// EGLFS backend's DRM FD, which we will need later.
if (g_QtDrmMasterFd == -1) {
// Grab the first DRM Master FD that makes it in here. This will be the Qt
// EGLFS backend's DRM FD, on which we will call drmDropMaster() later.
if (g_QtDrmMasterFd == -1 && drmIsMaster(fd)) {
g_QtDrmMasterFd = fd;
fstat64(g_QtDrmMasterFd, &g_DrmMasterStat);
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
@ -58,9 +67,9 @@ int drmModeSetCrtc(int fd, uint32_t crtcId, uint32_t bufferId,
int drmModeAtomicCommit(int fd, drmModeAtomicReqPtr req,
uint32_t flags, void *user_data)
{
// Grab the first DRM FD that makes it in here. This will be the Qt
// EGLFS backend's DRM FD, which we will need later.
if (g_QtDrmMasterFd == -1) {
// Grab the first DRM Master FD that makes it in here. This will be the Qt
// EGLFS backend's DRM FD, on which we will call drmDropMaster() later.
if (g_QtDrmMasterFd == -1 && drmIsMaster(fd)) {
g_QtDrmMasterFd = fd;
fstat64(g_QtDrmMasterFd, &g_DrmMasterStat);
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,