Added exec functions

libXmd/include/Xmd/Buffer.h

@@ -13,18 +13,20 @@ typedef struct _XmdBuffer XmdBuffer;
 #define XmdBufferNew(type) _XmdBufferNew(sizeof(type));
 XmdBuffer *_XmdBufferNew (Cardinal size);
 
-/* XmdBufferPush adds a new element to the buffer. */
+/* XmdBufferPush adds a new element to the buffer. If element is NULL, the new
+   element in the buffer is set to all zeros. */
 void XmdBufferPush (XmdBuffer *buffer, void *element);
 
 /* XmdBufferPop copies the last element into element, and removes it from the
-   buffer. */
+   buffer. If element is NULL, it removes the element without copying it. */
 void XmdBufferPop (XmdBuffer *buffer, void *element);
 
-/* XmdBufferPoke sets a single element of the buffer. */
+/* XmdBufferPoke sets a single element of the buffer. If element is NULL, the
+   element in the buffer is instead set to all zeros. */
 void XmdBufferPoke (XmdBuffer *buffer, Cardinal index, void *element);
 
 /* XmdBufferPeek copies the value of a single element of the buffer into
-   element.  */
+   element. If element is NULL, this function does nothing. */
 void XmdBufferPeek (XmdBuffer *buffer, Cardinal index, void *element);
 
 /* XmdBufferBreak frees the buffer without freeing its data. Its data is

libXmd/include/Xmd/Exec.h

@@ -0,0 +1,12 @@
+#ifndef _XmdExec_h
+#define _XmdExec_h
+
+#include <X11/Intrinsic.h>
+#include <stdio.h>
+#include <sys/types.h>
+
+FILE *XmdVaPipedExecPath (const String file, pid_t *child, String mode, ...);
+
+FILE *XmdPipedExecPath (const String file, pid_t *child, String mode, String const argv[]);
+
+#endif