1 files changed, 90 insertions, 0 deletions
diff --git a/readline/examples/rl-callbacktest.c b/readline/examples/rl-callbacktest.c
new file mode 100644
index 00000000000..0f00e57c564
--- /dev/null
+++ b/readline/examples/rl-callbacktest.c
@@ -0,0 +1,90 @@
+/* Standard include files. stdio.h is required. */
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+/* Used for select(2) */
+#include <sys/types.h>
+#include <sys/select.h>
+
+#include <errno.h>
+#include <stdio.h>
+
+/* Standard readline include files. */
+#if defined (READLINE_LIBRARY)
+#  include "readline.h"
+#  include "history.h"
+#else
+#  include <readline/readline.h>
+#  include <readline/history.h>
+#endif
+
+extern int errno;
+
+static void cb_linehandler (char *);
+
+int running;
+const char *prompt = "rltest$ ";
+
+/* Callback function called for each line when accept-line executed, EOF
+   seen, or EOF character read.  This sets a flag and returns; it could
+   also call exit(3). */
+static void
+cb_linehandler (char *line)
+{
+  /* Can use ^D (stty eof) or `exit' to exit. */
+  if (line == NULL || strcmp (line, "exit") == 0)
+    {
+      if (line == 0)
+        printf ("\n");
+      printf ("exit\n");
+      /* This function needs to be called to reset the terminal settings,
+	 and calling it from the line handler keeps one extra prompt from
+	 being displayed. */
+      rl_callback_handler_remove ();
+
+      running = 0;
+    }
+  else
+    {
+      if (*line)
+	add_history (line);
+      printf ("input line: %s\n", line);
+      free (line);
+    }
+}
+
+int
+main (int c, char **v)
+{
+  fd_set fds;
+  int r;
+
+  /* Install the line handler. */
+  rl_callback_handler_install (prompt, cb_linehandler);
+
+  /* Enter a simple event loop.  This waits until something is available
+     to read on readline's input stream (defaults to standard input) and
+     calls the builtin character read callback to read it.  It does not
+     have to modify the user's terminal settings. */
+  running = 1;
+  while (running)
+    {
+      FD_ZERO (&fds);
+      FD_SET (fileno (rl_instream), &fds);    
+
+      r = select (FD_SETSIZE, &fds, NULL, NULL, NULL);
+      if (r < 0 && errno != EINTR)
+	{
+	  perror ("rltest: select");
+	  rl_callback_handler_remove ();
+	  break;
+	}
+
+      if (FD_ISSET (fileno (rl_instream), &fds))
+	rl_callback_read_char ();
+    }
+
+  printf ("rltest: Event loop has exited\n");
+  return 0;
+}