auto import from //depot/cupcake/@135843
diff --git a/toolbox/smd.c b/toolbox/smd.c
new file mode 100644
index 0000000..65ff994e
--- /dev/null
+++ b/toolbox/smd.c
@@ -0,0 +1,40 @@
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <errno.h>
+
+int smd_main(int argc, char **argv)
+{
+ int fd, len, r, port = 0;
+ char devname[32];
+ argc--;
+ argv++;
+
+ if((argc > 0) && (argv[0][0] == '-')) {
+ port = atoi(argv[0] + 1);
+ argc--;
+ argv++;
+ }
+
+ sprintf(devname,"/dev/smd%d",port);
+ fd = open(devname, O_WRONLY);
+ if(fd < 0) {
+ fprintf(stderr,"failed to open smd0 - %s\n",
+ strerror(errno));
+ return -1;
+ }
+ while(argc > 0) {
+ len = strlen(argv[0]);
+ r = write(fd, argv[0], len);
+ if(r != len) {
+ fprintf(stderr,"failed to write smd0 (%d) %s\n",
+ r, strerror(errno));
+ return -1;
+ }
+ argc--;
+ argv++;
+ write(fd, argc ? " " : "\r", 1);
+ }
+ close(fd);
+ return 0;
+}