know how really to set/clear RTS: use TIOCM*; see /usr/include/asm/termios.h for...

diff --git a/parport/serial-tcflow.c b/parport/serial-tcflow.c
index 1011ff526743ba0f636b24fbc8b185ed462d6fa4..e8b8ded3360b852acd97bc64ac06b62e19d4d069 100644 (file)
--- a/parport/serial-tcflow.c
+++ b/parport/serial-tcflow.c
@@ -4,18 +4,31 @@
 #include <string.h>
 #include <unistd.h>
 #include <stdlib.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
 
 int main(int argc, const char *const *argv) {
-  int op, r;
+  int op, r, v=0, *vp=0, v0;
   
   switch (argv[1][0]) {
   case 'N': op= TCOOFF; break;
   case 'Y': op= TCOON;  break;
   case 'n': op= TCIOFF; break;
   case 'y': op= TCION;  break;
+  case 'g': op= TIOCMGET; vp=&v; break;
+  case 's': op= TIOCMSET; vp=&v; v=atoi(argv[1]+1); break;
+  case 'C': op= TIOCMBIC; vp=&v; v=atoi(argv[1]+1); break;
+  case 'S': op= TIOCMBIS; vp=&v; v=atoi(argv[1]+1); break;
   default: abort();
   }
-  r= tcflow(3,op);
-  fprintf(stderr,"r=%d e=%s\n",r,strerror(errno));
+  errno= 0;
+  v0= v;
+  if (!vp) {
+    v= 0;
+    r= tcflow(3,op);
+  } else {
+    r= ioctl(3,op,vp);
+  }
+  fprintf(stderr,"v0=0x%02x r=%d v=0x%02x e=%s\n",v0,r,v,strerror(errno));
   return 0;
 }