X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=signal.c;h=33449c632f5214e5acd464faeeae079b0701f0d5;hp=1db008ca89a92a23f3c08017a74be04e3e06f1d5;hb=debe0b5737118f7f1806cc133e81549d88340bfd;hpb=dcf9594fa041cdfae819186ed7e145d079110318

diff --git a/signal.c b/signal.c
index 1db008ca..33449c63 100644
--- a/signal.c
+++ b/signal.c
@@ -62,45 +62,50 @@ static void generic_signal_handler(int s)
 }
 
 /**
- * reap one child
+ * Reap one child.
  *
- * call waitpid() and print a log message containing the pid
- * and the cause of the child's death.
+ * \param pid In case a child died, its pid is returned here.
+ *
+ * Call waitpid() and print a log message containing the pid and the cause of
+ * the child's death.
+ *
+ * \return A (negative) paraslash error code on errors, zero, if no child died,
+ * one otherwise. If and only if the function returns one, the content of \a
+ * pid is meaningful.
  *
- * \return Like \p waitpid(), this function returns the process ID of the
- * terminated child; on error, \p -E_WAITPID is returned.
  * \sa waitpid(2)
  */
-pid_t para_reap_child(void)
+int para_reap_child(pid_t *pid)
 {
 	int status;
-	pid_t pid = waitpid(-1, &status, WNOHANG);
+	*pid = waitpid(-1, &status, WNOHANG);
 
-	if (pid <= 0) {
-		if (pid < 0)
-			pid = -E_WAITPID;
-		return pid;
-	}
+	if (!*pid)
+		return 0;
+	if (*pid < 0)
+		return -ERRNO_TO_PARA_ERROR(errno);
 	if (WIFEXITED(status))
-		PARA_DEBUG_LOG("child %i exited. Exit status: %i\n", pid,
+		PARA_DEBUG_LOG("child %i exited. Exit status: %i\n", *pid,
 			WEXITSTATUS(status));
 	else if (WIFSIGNALED(status))
-		PARA_DEBUG_LOG("child %i was killed by signal %i\n", pid,
+		PARA_DEBUG_LOG("child %i was killed by signal %i\n", *pid,
 			WTERMSIG(status));
 	else
-		PARA_WARNING_LOG("child %i terminated abormally\n", pid);
-	return pid;
+		PARA_WARNING_LOG("child %i terminated abormally\n", *pid);
+	return 1;
 }
 
 /**
- * paraslash's zombie killer
+ * Paraslash's zombie killer.
  *
  * It just calls \p para_reap_child() until there are no more children left to
  * reap.
  */
 void para_reap_children(void)
 {
-	while (para_reap_child() > 0)
+	pid_t pid;
+
+	while (para_reap_child(&pid) > 0)
 		; /* nothing */
 }
 
@@ -138,3 +143,8 @@ int para_next_signal(void)
 	}
 	return r < 0 && (errno != EAGAIN)? 0 : -E_SIGNAL_READ;
 }
+
+void para_signal_shutdown(void)
+{
+	close(signal_pipe[1]);
+}