Don't crash if the user provides -s without a pid.

Reported-by: Michael Orlitzky <michael@orlitzky.com>
rwmacleod · Mar 8, 2011 · 919fff7 · 919fff7
1 parent 2d1a9e5
commit 919fff7
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/reptyr.c b/reptyr.c
@@ -199,6 +199,12 @@ int main(int argc, char **argv) {
         }
     }
 
+    if (do_attach && arg >= argc) {
+        fprintf(stderr, "%s: No pid specified to attach\n", argv[0]);
+        usage(argv[0]);
+        return 1;
+    }
+
     if ((pty = open("/dev/ptmx", O_RDWR|O_NOCTTY)) < 0)
         die("Unable to open /dev/ptmx: %m");
     if (unlockpt(pty) < 0)