From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Mon, 1 Feb 2021 18:39:48 +0000 (+0100)
Subject: hurd TIOCFLUSH: Cope BSD 4.1 semantic
X-Git-Tag: glibc-2.34~998
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=36231bee7ab36d59dd121ea85b91411ae86945f3;p=thirdparty%2Fglibc.git

hurd TIOCFLUSH: Cope BSD 4.1 semantic

BSD 4.1 did not have an argument for TIOCFLUSH, BSD 4.2 added it. There
are still a lot of applications out there that pass a NULL argument to
TIOCFLUSH, so we should rather cope with it.
---

diff --git a/sysdeps/mach/hurd/ioctl.c b/sysdeps/mach/hurd/ioctl.c
index 662e8ee9196..0d5bc176d10 100644
--- a/sysdeps/mach/hurd/ioctl.c
+++ b/sysdeps/mach/hurd/ioctl.c
@@ -113,6 +113,10 @@ __ioctl (int fd, unsigned long int request, ...)
 	  /* We don't want to advance ARG since it will be used to copy out
 	     too if IOC_OUT is also set.  */
 	  void *argptr = arg;
+	  int zero = 0;
+
+	  if (request == TIOCFLUSH && !arg)
+	    arg = &zero;
 
 	  /* Pack an argument into the message buffer.  */
 	  void in (unsigned int count, enum __ioctl_datum type)