Adapt gallium and libdrm plugins to current libc

This patch adapts the gallium and libdrm libc plugins to the current
workings of the libc.

Fixes #1070.

libports/src/lib/gallium/i915/query_device_id.cc

@@ -53,8 +53,8 @@ namespace {
 
 			bool supports_open(const char *pathname, int flags)
 			{
-				return !Genode::strcmp(pathname,
+				return (Genode::strcmp(pathname,
-				                       "/sys/class/drm/card0/device/device");
+				                       "/sys/class/drm/card0/device/device") == 0);
 			}
 
 			Libc::File_descriptor *open(const char *pathname, int flags)
@@ -88,6 +88,23 @@ namespace {
 				context(fd)->position += count;
 				return count;
 			}
+
+			bool supports_stat(const char *path)
+			{
+				return (Genode::strcmp(path, "/sys") == 0) ||
+				       (Genode::strcmp(path, "/sys/class") == 0) ||
+				       (Genode::strcmp(path, "/sys/class/drm") == 0) ||
+				       (Genode::strcmp(path, "/sys/class/drm/card0") == 0) ||
+				       (Genode::strcmp(path, "/sys/class/drm/card0/device") == 0) ||
+				       (Genode::strcmp(path, "/sys/class/drm/card0/device/device") == 0);
+			}
+
+			int stat(const char *path, struct stat *buf)
+			{
+				if (buf)
+					buf->st_mode = S_IFDIR;
+				return 0;
+			}
 	};
 }
 

libports/src/lib/libdrm/ioctl.cc

@@ -139,6 +139,20 @@ namespace {
 				return Libc::file_descriptor_allocator()->alloc(this, context);
 			}
 
+			bool supports_stat(const char *path)
+			{
+				return (Genode::strcmp(path, "/dev") == 0 ||
+				        Genode::strcmp(path, "/dev/drm") == 0);
+			}
+
+			int stat(const char *path, struct stat *buf)
+			{
+				if (buf)
+					buf->st_mode = S_IFDIR;
+
+				return 0;
+			}
+
 			int ioctl(Libc::File_descriptor *fd, int request, char *argp)
 			{
 				if (verbose_ioctl)
@@ -152,6 +166,8 @@ namespace {
 				return _driver->ioctl(_client, drm_command(request), argp);
 			}
 
+			bool supports_mmap() { return true; }
+
 			/**
 			 * Pseudo mmap specific for DRM device
 			 *