From: Greg Hudson <ghudson@mit.edu>
Date: Wed, 3 Oct 2018 22:45:56 +0000 (-0400)
Subject: Disable stdin buffering in libss dummy readline
X-Git-Tag: krb5-1.17-beta1~31
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F854%2Fhead;p=thirdparty%2Fkrb5.git

Disable stdin buffering in libss dummy readline

readline() is careful not to read more bytes from fd 0 than it has to.
Do the same in the dummy libss readline() by disabling stdin
buffering.

ticket: 8745
---

diff --git a/src/util/ss/listen.c b/src/util/ss/listen.c
index c99caa34bd..879ebcfbd5 100644
--- a/src/util/ss/listen.c
+++ b/src/util/ss/listen.c
@@ -33,6 +33,9 @@ static char *readline(const char *prompt)
     struct termios termbuf;
     char input[BUFSIZ];
 
+    /* Make sure we don't buffer anything beyond the line read. */
+    setvbuf(stdin, 0, _IONBF, 0);
+
     if (tcgetattr(STDIN_FILENO, &termbuf) == 0) {
         termbuf.c_lflag |= ICANON|ISIG|ECHO;
         tcsetattr(STDIN_FILENO, TCSANOW, &termbuf);