load librtdm without xeno_rtdm

Hi,

as suggested in an earlier mail, here is a patch that - as I think - improves the behaviour of librtdm. It will let applications start even if the kernel services of RTDM are not available. Instead, -ENODEV or -EAFNOSUPPORT will be returned in this case when the user tries to open some device or socket later - just like there is no appropriate driver loaded, which is actually true!

Please apply.

Jan

------------------------------------------------------------------------

Index: src/skins/rtdm/core.c
===================================================================

skins/rtdm/core.c +16 -9

@@ -18,6 +18,7 @@
 
 #include <stdarg.h>
 #include <stddef.h>
+#include <errno.h>
 
 #include <xenomai/rtdm/rtdm.h>
 #include <xenomai/rtdm/syscall.h>

@@ -27,19 +28,25 @@
 
 int rt_dev_open(const char *path, int oflag, ...)
 {
-  return XENOMAI_SKINCALL2( __rtdm_muxid,
-                            __rtdm_open,
-                            path,
-                            oflag);
+    if (__rtdm_muxid < 0)
+        return -ENODEV;
+
+    return XENOMAI_SKINCALL2( __rtdm_muxid,
+                              __rtdm_open,
+                              path,
+                              oflag);
 }
 
 int rt_dev_socket(int protocol_family, int socket_type, int protocol)
 {
-  return XENOMAI_SKINCALL3( __rtdm_muxid,
-                            __rtdm_socket,
-                            protocol_family,
-                            socket_type,
-                            protocol);
+    if (__rtdm_muxid < 0)
+        return -EAFNOSUPPORT;
+
+    return XENOMAI_SKINCALL3( __rtdm_muxid,
+                              __rtdm_socket,
+                              protocol_family,
+                              socket_type,
+                              protocol);
 }
 
 int rt_dev_close(int fd)

Index: src/skins/rtdm/init.c
===================================================================

skins/rtdm/init.c +3 -4

@@ -53,9 +53,9 @@
 	case -ENOSYS:
 	case -ESRCH:
 
-	    fprintf(stderr,"Xenomai: RTDM skin or CONFIG_XENO_OPT_PERVASIVE disabled.\n");
-	    fprintf(stderr,"(modprobe xeno_rtdm.ko?)\n");
-	    exit(1);
+	    /* we ignore this and fail later when the user tries to open
+	       a device or socket. */
+	    break;
 
 	default:
 
 
 
------------------------------------------------------------------------

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