Initial checkin for launch(1). No changes yet for GNO v2.0.6.

The man page has been copied from the gno/usr.man/man1 directory,
from which it will be deleted.

usr.bin/launch/launch.c

@@ -0,0 +1,33 @@
+#include <stdio.h>
+#include <gno/gno.h>
+#include <gsos.h>
+#include <sys/signal.h>
+
+void usage(void)
+{
+    fprintf(stderr,"usage: launch [-n] pathname\n");
+    fprintf(stderr,"  -n\tDo not return to GNO after launched program exits\n");
+    exit(1);
+}
+
+int main(int argc, char *argv[])
+{
+GSString255Ptr gs;
+extern GSString255Ptr __C2GSMALLOC(char *);
+unsigned int quitFlag;
+int patharg = 1;
+
+    quitFlag = 0x8000;
+    if (argc == 3) {
+        if (strcmp("-n",argv[1])) usage();
+        else {
+            quitFlag = 0;
+            patharg = 2;
+        }
+    }
+
+    gs = __C2GSMALLOC(argv[patharg]);
+    SetGNOQuitRec(2,gs,quitFlag);
+    /* eventually will need to signal 'init' to shutdown the system;
+       for now, simply make the user ^D the shell */
+}