Initial revision

commands/simple/tty.c

@@ -0,0 +1,30 @@
+/* tty.c - Return tty name		Author: Freeman P. Pascal IV */
+
+/* Minor changes to make tty conform to POSIX1003.2 Draft10
+   Thomas Brupbacher (tobr@mw.lpc.ethz.ch)			*/
+
+#include <sys/types.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdio.h>
+
+_PROTOTYPE(int main, (int argc, char **argv));
+
+int main(argc, argv)
+int argc;
+char *argv[];
+{
+  char *tty_name;
+
+  tty_name = ttyname(STDIN_FILENO);
+  if ((argc == 2) && (!strcmp(argv[1], "-s")))
+	 /* Do nothing - shhh! we're in silent mode */ ;
+  else
+	puts((tty_name != NULL) ? tty_name : "not a tty");
+
+  if (isatty(STDIN_FILENO) == 0)
+	return(1);
+  else
+	return(0);
+}