diff --git a/src/future/exec/execx.php b/src/future/exec/execx.php
index bde37d29..ee920aff 100644
--- a/src/future/exec/execx.php
+++ b/src/future/exec/execx.php
@@ -1,107 +1,107 @@
 <?php
 
 /**
  * Execute a command and capture stdout and stderr. If the command exits with
  * a nonzero error code, a @{class:CommandException} will be thrown. If you need
  * to manually handle error conditions, use @{function:exec_manual}.
  *
  *   list ($stdout, $stderr) = execx('ls %s', $file);
  *
  * @param  string  sprintf()-style command pattern to execute.
  * @param  ...     Arguments to sprintf pattern.
  * @return array   List of stdout and stderr.
  */
 function execx($cmd /* , ... */) {
   $args = func_get_args();
   $future = newv('ExecFuture', $args);
   return $future->resolvex();
 }
 
 
 /**
  * Execute a command and capture stdout, stderr, and the return value.
  *
  *   list ($err, $stdout, $stderr) = exec_manual('ls %s', $file);
  *
  * When invoking this function, you must manually handle the error condition.
  * Error flows can often be simplified by using @{function:execx} instead,
  * which throws an exception when it encounters an error.
  *
  * @param  string  sprintf()-style command pattern to execute.
  * @param  ...     Arguments to sprintf pattern.
  * @return array   List of return code, stdout, and stderr.
  */
 function exec_manual($cmd /* , ... */) {
   $args = func_get_args();
   $ef = newv('ExecFuture', $args);
   return $ef->resolve();
 }
 
 
 /**
  * Wrapper for @{class:PhutilExecPassthru}.
  *
  * @param  string  sprintf()-style command pattern to execute.
  * @param  ...     Arguments to sprintf pattern.
  * @return int     Return code.
  */
 function phutil_passthru($cmd /* , ... */) {
   $args = func_get_args();
-  return newv('PhutilExecPassthru', $args)->execute();
+  return newv('PhutilExecPassthru', $args)->resolve();
 }
 
 
 /**
  * Return a human-readable signal name (like "SIGINT" or "SIGKILL") for a given
  * signal number.
  *
  * @param   int     Signal number.
  * @return  string  Human-readable signal name.
  */
 function phutil_get_signal_name($signo) {
   // These aren't always defined; try our best to look up the signal name.
   $constant_names = array(
     'SIGHUP',
     'SIGINT',
     'SIGQUIT',
     'SIGILL',
     'SIGTRAP',
     'SIGABRT',
     'SIGIOT',
     'SIGBUS',
     'SIGFPE',
     'SIGUSR1',
     'SIGSEGV',
     'SIGUSR2',
     'SIGPIPE',
     'SIGALRM',
     'SIGTERM',
     'SIGSTKFLT',
     'SIGCLD',
     'SIGCHLD',
     'SIGCONT',
     'SIGTSTP',
     'SIGTTIN',
     'SIGTTOU',
     'SIGURG',
     'SIGXCPU',
     'SIGXFSZ',
     'SIGVTALRM',
     'SIGPROF',
     'SIGWINCH',
     'SIGPOLL',
     'SIGIO',
     'SIGPWR',
     'SIGSYS',
     'SIGBABY',
   );
 
   $signal_names = array();
   foreach ($constant_names as $constant) {
     if (defined($constant)) {
       $signal_names[constant($constant)] = $constant;
     }
   }
 
   return idx($signal_names, $signo);
 }