sendmail: don't talk until 220 code is seen. Closes 3487

[platform/upstream/busybox.git] / mailutils / mail.c

diff --git a/mailutils/mail.c b/mailutils/mail.c
index 66c7947..f5260d9 100644 (file)
--- a/mailutils/mail.c
+++ b/mailutils/mail.c
@@ -57,10 +57,13 @@ void FAST_FUNC launch_helper(const char **argv)
        G.helper_pid = xvfork();
 
        i = (!G.helper_pid) * 2; // for parent:0, for child:2
-       close(pipes[i + 1]); // 1 or 3 - closing one write end
-       close(pipes[2 - i]); // 2 or 0 - closing one read end
-       xmove_fd(pipes[i], STDIN_FILENO); // 0 or 2 - using other read end
-       xmove_fd(pipes[3 - i], STDOUT_FILENO); // 3 or 1 - other write end
+       close(pipes[i + 1]);     // 1 or 3 - closing one write end
+       close(pipes[2 - i]);     // 2 or 0 - closing one read end
+       xmove_fd(pipes[i], STDIN_FILENO);      // 0 or 2 - using other read end
+       xmove_fd(pipes[3 - i], STDOUT_FILENO); // 3 or 1 - using other write end
+       // End result:
+       // parent stdout [3] -> child stdin [2]
+       // child stdout [1] -> parent stdin [0]
 
        if (!G.helper_pid) {
                // child: try to execute connection helper