diff options
author | Jonathan Gray <jsg@jsg.id.au> | 2016-12-17 16:09:52 +1100 |
---|---|---|
committer | Emil Velikov <emil.l.velikov@gmail.com> | 2016-12-24 17:06:53 +0000 |
commit | e2e766d5acdbb826f1cfe5643669db54ee86f456 (patch) | |
tree | 7508331243098b57fafcee55e79813cd60a7677e /xf86drm.c | |
parent | d5cf3f98314c1b9d87216e00c30c9fef06ff24c3 (diff) |
xf86drm: add a non-sysfs version of drmGetDeviceNameFromFd2
Implement a generic drmGetDeviceNameFromFd2() to use on non-linux
systems without sysfs.
v2: remove min < base test as requested by Emil
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Jonathan Gray <jsg@jsg.id.au>
Diffstat (limited to 'xf86drm.c')
-rw-r--r-- | xf86drm.c | 44 |
1 files changed, 42 insertions, 2 deletions
@@ -3627,7 +3627,47 @@ char *drmGetDeviceNameFromFd2(int fd) fclose(f); return device_name; #else -#warning "Missing implementation of drmGetDeviceNameFromFd2" - return NULL; + struct stat sbuf; + char node[PATH_MAX + 1]; + const char *dev_name; + int node_type; + int maj, min, n, base; + + if (fstat(fd, &sbuf)) + return NULL; + + maj = major(sbuf.st_rdev); + min = minor(sbuf.st_rdev); + + if (maj != DRM_MAJOR || !S_ISCHR(sbuf.st_mode)) + return NULL; + + node_type = drmGetMinorType(min); + if (node_type == -1) + return NULL; + + switch (node_type) { + case DRM_NODE_PRIMARY: + dev_name = DRM_DEV_NAME; + break; + case DRM_NODE_CONTROL: + dev_name = DRM_CONTROL_DEV_NAME; + break; + case DRM_NODE_RENDER: + dev_name = DRM_RENDER_DEV_NAME; + break; + default: + return NULL; + }; + + base = drmGetMinorBase(node_type); + if (base < 0) + return NULL; + + n = snprintf(node, PATH_MAX, dev_name, DRM_DIR_NAME, min - base); + if (n == -1 || n >= PATH_MAX) + return NULL; + + return strdup(node); #endif } |