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>
main
Jonathan Gray 2016-12-17 16:09:52 +11:00 committed by Emil Velikov
parent d5cf3f9831
commit e2e766d5ac
1 changed files with 42 additions and 2 deletions

View File

@ -3627,7 +3627,47 @@ char *drmGetDeviceNameFromFd2(int fd)
fclose(f); fclose(f);
return device_name; return device_name;
#else #else
#warning "Missing implementation of drmGetDeviceNameFromFd2" struct stat sbuf;
return NULL; 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 #endif
} }