[Mesa-dev] [PATCH v3] egl/dri2: use drm macros to construct device name

[Jonathan Gray]

Don't hardcode /dev/dri/card0 but instead use the drm
macros which allows the correct /dev/drm0 device to be
opened on OpenBSD.

v2: use snprintf and fallback to /dev/dri/card0
v3: check for snprintf truncation

Signed-off-by: Jonathan Gray <jsg at jsg.id.au>
---
 src/egl/drivers/dri2/platform_drm.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/egl/drivers/dri2/platform_drm.c b/src/egl/drivers/dri2/platform_drm.c
index 2f7edb9..9a7633a 100644
--- a/src/egl/drivers/dri2/platform_drm.c
+++ b/src/egl/drivers/dri2/platform_drm.c
@@ -492,7 +492,12 @@ dri2_initialize_drm(_EGLDriver *drv, _EGLDisplay *disp)
 
    gbm = disp->PlatformDisplay;
    if (gbm == NULL) {
-      fd = open("/dev/dri/card0", O_RDWR);
+      char buf[64];
+      int n = snprintf(buf, sizeof(buf), DRM_DEV_NAME, DRM_DIR_NAME, 0);
+      if (n != -1 && n < sizeof(buf))
+         fd = open(buf, O_RDWR);
+      if (fd < 0)
+         fd = open("/dev/dri/card0", O_RDWR);
       dri2_dpy->own_device = 1;
       gbm = gbm_create_device(fd);
       if (gbm == NULL)
-- 
1.9.0