diff --git a/catgets/open_catalog.c b/catgets/open_catalog.c
index 46c444d2..129f4662 100644
--- a/catgets/open_catalog.c
+++ b/catgets/open_catalog.c
@@ -49,7 +49,7 @@ __open_catalog (const char *cat_name, const char *nlspath, const char *env_var,
   char *buf = NULL;
 
   if (strchr (cat_name, '/') != NULL || nlspath == NULL)
-    fd = __open_nocancel (cat_name, O_RDONLY | O_CLOEXEC);
+    fd = __open_nocancel (cat_name, O_RDONLY | O_CLOEXEC | O_IGNORE_CTTY);
   else
     {
       const char *run_nlspath = nlspath;
@@ -177,7 +177,7 @@ __open_catalog (const char *cat_name, const char *nlspath, const char *env_var,
 
 	  if (bufact != 0)
 	    {
-	      fd = __open_nocancel (buf, O_RDONLY | O_CLOEXEC);
+	      fd = __open_nocancel (buf, O_RDONLY | O_CLOEXEC | O_IGNORE_CTTY);
 	      if (fd >= 0)
 		break;
 	    }
diff --git a/csu/check_fds.c b/csu/check_fds.c
index de6dd716..636bc431 100644
--- a/csu/check_fds.c
+++ b/csu/check_fds.c
@@ -90,7 +90,7 @@ __libc_check_standard_fds (void)
      is really paranoid but some people actually are.  If /dev/null
      should happen to be a symlink to somewhere else and not the
      device commonly known as "/dev/null" we bail out.  */
-  check_one_fd (STDIN_FILENO, O_WRONLY | O_NOFOLLOW);
-  check_one_fd (STDOUT_FILENO, O_RDONLY | O_NOFOLLOW);
-  check_one_fd (STDERR_FILENO, O_RDONLY | O_NOFOLLOW);
+  check_one_fd (STDIN_FILENO, O_WRONLY | O_NOFOLLOW | O_IGNORE_CTTY);
+  check_one_fd (STDOUT_FILENO, O_RDONLY | O_NOFOLLOW | O_IGNORE_CTTY);
+  check_one_fd (STDERR_FILENO, O_RDONLY | O_NOFOLLOW | O_IGNORE_CTTY);
 }
diff --git a/elf/dl-load.c b/elf/dl-load.c
index 9a0e40c0..009484f1 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -1616,7 +1616,7 @@ open_verify (const char *name, int fd,
 
   if (fd == -1)
     /* Open the file.  We always open files read-only.  */
-    fd = __open64_nocancel (name, O_RDONLY | O_CLOEXEC);
+    fd = __open64_nocancel (name, O_RDONLY | O_CLOEXEC | O_IGNORE_CTTY);
 
   if (fd != -1)
     {
diff --git a/elf/dl-misc.c b/elf/dl-misc.c
index 5b84adc2..85931c7c 100644
--- a/elf/dl-misc.c
+++ b/elf/dl-misc.c
@@ -36,7 +36,7 @@ _dl_sysdep_read_whole_file (const char *file, size_t *sizep, int prot)
 {
   void *result = MAP_FAILED;
   struct __stat64_t64 st;
-  int fd = __open64_nocancel (file, O_RDONLY | O_CLOEXEC);
+  int fd = __open64_nocancel (file, O_RDONLY | O_CLOEXEC | O_IGNORE_CTTY);
   if (fd >= 0)
     {
       if (__fstat64_time64 (fd, &st) >= 0)
diff --git a/elf/dl-profile.c b/elf/dl-profile.c
index d8345da2..ff97b129 100644
--- a/elf/dl-profile.c
+++ b/elf/dl-profile.c
@@ -325,7 +325,7 @@ _dl_start_profile (void)
   __stpcpy (__stpcpy (cp, GLRO(dl_profile)), ".profile");
 
   fd = __open64_nocancel (filename, O_RDWR | O_CREAT | O_NOFOLLOW
-			  | O_CLOEXEC, DEFFILEMODE);
+			  | O_CLOEXEC | O_IGNORE_CTTY, DEFFILEMODE);
   if (fd == -1)
     {
       char buf[400];
diff --git a/gmon/gmon.c b/gmon/gmon.c
index 6439ed1c..ed13b3ce 100644
--- a/gmon/gmon.c
+++ b/gmon/gmon.c
@@ -385,13 +385,13 @@ write_gmon (void)
 	char buf[len + 20];
 	__snprintf (buf, sizeof (buf), "%s.%u", env, __getpid ());
 	fd = __open_nocancel (buf, O_CREAT | O_TRUNC | O_WRONLY | O_NOFOLLOW
-			      | O_CLOEXEC, 0666);
+			      | O_CLOEXEC | O_IGNORE_CTTY, 0666);
       }
 
     if (fd == -1)
       {
 	fd = __open_nocancel ("gmon.out", O_CREAT | O_TRUNC | O_WRONLY
-			      | O_NOFOLLOW | O_CLOEXEC, 0666);
+			      | O_NOFOLLOW | O_CLOEXEC | O_IGNORE_CTTY, 0666);
 	if (fd < 0)
 	  {
 	    char buf[300];
diff --git a/iconv/gconv_cache.c b/iconv/gconv_cache.c
index 87136e24..c8d972c8 100644
--- a/iconv/gconv_cache.c
+++ b/iconv/gconv_cache.c
@@ -58,7 +58,8 @@ __gconv_load_cache (void)
     return -1;
 
   /* See whether the cache file exists.  */
-  fd = __open_nocancel (GCONV_MODULES_CACHE, O_RDONLY | O_CLOEXEC, 0);
+  fd = __open_nocancel (GCONV_MODULES_CACHE, O_RDONLY
+			| O_CLOEXEC | O_IGNORE_CTTY, 0);
   if (__builtin_expect (fd, 0) == -1)
     /* Not available.  */
     return -1;
diff --git a/locale/loadarchive.c b/locale/loadarchive.c
index 5b857d5d..f88ff8b8 100644
--- a/locale/loadarchive.c
+++ b/locale/loadarchive.c
@@ -202,7 +202,8 @@ _nl_load_locale_from_archive (int category, const char **namep)
       archmapped = &headmap;
 
       /* The archive has never been opened.  */
-      fd = __open_nocancel (archfname, O_RDONLY|O_LARGEFILE|O_CLOEXEC);
+      fd = __open_nocancel (archfname, O_RDONLY | O_LARGEFILE
+			    | O_CLOEXEC | O_IGNORE_CTTY);
       if (fd < 0)
 	/* Cannot open the archive, for whatever reason.  */
 	return NULL;
@@ -397,8 +398,8 @@ _nl_load_locale_from_archive (int category, const char **namep)
 	  if (fd == -1)
 	    {
 	      struct __stat64_t64 st;
-	      fd = __open_nocancel (archfname,
-				    O_RDONLY|O_LARGEFILE|O_CLOEXEC);
+	      fd = __open_nocancel (archfname, O_RDONLY | O_LARGEFILE
+				    | O_CLOEXEC | O_IGNORE_CTTY);
 	      if (fd == -1)
 		/* Cannot open the archive, for whatever reason.  */
 		return NULL;
diff --git a/locale/loadlocale.c b/locale/loadlocale.c
index 671e71cf..582144ed 100644
--- a/locale/loadlocale.c
+++ b/locale/loadlocale.c
@@ -240,7 +240,7 @@ _nl_load_locale (struct loaded_l10nfile *file, int category)
   file->decided = 1;
   file->data = NULL;
 
-  fd = __open_nocancel (file->filename, O_RDONLY | O_CLOEXEC);
+  fd = __open_nocancel (file->filename, O_RDONLY | O_CLOEXEC | O_IGNORE_CTTY);
   if (__builtin_expect (fd, 0) < 0)
     /* Cannot open the file.  */
     return;
@@ -267,7 +267,7 @@ _nl_load_locale (struct loaded_l10nfile *file, int category)
 			    "/SYS_", 5), _nl_category_names_get (category),
 		 _nl_category_name_sizes[category] + 1);
 
-      fd = __open_nocancel (newp, O_RDONLY | O_CLOEXEC);
+      fd = __open_nocancel (newp, O_RDONLY | O_CLOEXEC | O_IGNORE_CTTY);
       if (__builtin_expect (fd, 0) < 0)
 	return;
 
diff --git a/login/openpty.c b/login/openpty.c
index 1e44852a..a89555b2 100644
--- a/login/openpty.c
+++ b/login/openpty.c
@@ -117,7 +117,7 @@ __openpty (int *pptmx, int *pterminal, char *name,
       if (pts_name (ptmx, &buf, sizeof (_buf)))
         goto on_error;
 
-      terminal = __open64 (buf, O_RDWR | O_NOCTTY);
+      terminal = __open64 (buf, O_RDWR | O_NOCTTY | O_IGNORE_CTTY);
       if (terminal == -1)
         goto on_error;
     }
diff --git a/login/utmp_file.c b/login/utmp_file.c
index 1ef07821..a7815096 100644
--- a/login/utmp_file.c
+++ b/login/utmp_file.c
@@ -142,7 +142,7 @@ __libc_setutent (void)
 
       file_writable = false;
       file_fd = __open_nocancel
-	(file_name, O_RDONLY | O_LARGEFILE | O_CLOEXEC);
+	(file_name, O_RDONLY | O_LARGEFILE | O_CLOEXEC | O_IGNORE_CTTY);
       if (file_fd == -1)
 	return 0;
     }
@@ -354,7 +354,7 @@ __libc_pututline (const struct utmp *data)
       const char *file_name = TRANSFORM_UTMP_FILE_NAME (__libc_utmp_file_name);
 
       int new_fd = __open_nocancel
-	(file_name, O_RDWR | O_LARGEFILE | O_CLOEXEC);
+	(file_name, O_RDWR | O_LARGEFILE | O_CLOEXEC | O_IGNORE_CTTY);
       if (new_fd == -1)
 	return NULL;
 
@@ -463,7 +463,8 @@ __libc_updwtmp (const char *file, const struct utmp *utmp)
   int fd;
 
   /* Open WTMP file.  */
-  fd = __open_nocancel (file, O_WRONLY | O_LARGEFILE | O_CLOEXEC);
+  fd = __open_nocancel (file, O_WRONLY | O_LARGEFILE
+			| O_CLOEXEC | O_IGNORE_CTTY);
   if (fd < 0)
     return -1;
 
diff --git a/misc/daemon.c b/misc/daemon.c
index 61da49b7..d5bf173f 100644
--- a/misc/daemon.c
+++ b/misc/daemon.c
@@ -67,7 +67,7 @@ daemon (int nochdir, int noclose)
     {
       struct __stat64_t64 st;
 
-      fd = __open_nocancel(_PATH_DEVNULL, O_RDWR, 0);
+      fd = __open_nocancel(_PATH_DEVNULL, O_RDWR | O_IGNORE_CTTY, 0);
       if (fd != -1 && __glibc_likely (__fstat64_time64 (fd, &st) == 0))
         {
           if (__builtin_expect (S_ISCHR (st.st_mode), 1) != 0
diff --git a/nss/nss_db/db-open.c b/nss/nss_db/db-open.c
index 13670600..c572d62c 100644
--- a/nss/nss_db/db-open.c
+++ b/nss/nss_db/db-open.c
@@ -36,7 +36,8 @@ internal_setent (const char *file, struct nss_db_map *mapping)
 {
   enum nss_status status = NSS_STATUS_UNAVAIL;
 
-  int fd = __open_nocancel (file, O_RDONLY | O_LARGEFILE | O_CLOEXEC);
+  int fd = __open_nocancel (file, O_RDONLY | O_LARGEFILE
+			    | O_CLOEXEC | O_IGNORE_CTTY);
   if (fd != -1)
     {
       struct nss_db_header header;
diff --git a/rt/shm_open.c b/rt/shm_open.c
index fc1dc96b..7fd62cf3 100644
--- a/rt/shm_open.c
+++ b/rt/shm_open.c
@@ -37,7 +37,7 @@ __shm_open (const char *name, int oflag, mode_t mode)
       return -1;
     }
 
-  oflag |= O_NOFOLLOW | O_CLOEXEC;
+  oflag |= O_NOFOLLOW | O_CLOEXEC | O_IGNORE_CTTY;
 #if defined (SHM_ANON) && defined (O_TMPFILE)
   if (name == SHM_ANON)
     oflag |= O_TMPFILE;
diff --git a/shadow/lckpwdf.c b/shadow/lckpwdf.c
index 3b36b2eb..4a623c41 100644
--- a/shadow/lckpwdf.c
+++ b/shadow/lckpwdf.c
@@ -96,7 +96,7 @@ __lckpwdf (void)
   /* Prevent problems caused by multiple threads.  */
   __libc_lock_lock (lock);
 
-  int oflags = O_WRONLY | O_CREAT | O_CLOEXEC;
+  int oflags = O_WRONLY | O_CREAT | O_CLOEXEC | O_IGNORE_CTTY;
   lock_fd = __open (PWD_LOCKFILE, oflags, 0600);
   if (lock_fd == -1)
     /* Cannot create lock file.  */
diff --git a/sysdeps/mach/hurd/opendir.c b/sysdeps/mach/hurd/opendir.c
index cfba659c..a9e8f94d 100644
--- a/sysdeps/mach/hurd/opendir.c
+++ b/sysdeps/mach/hurd/opendir.c
@@ -79,7 +79,7 @@ __opendirat (int dfd, const char *name)
       return NULL;
     }
 
-  int flags = O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_CLOEXEC;
+  int flags = O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_CLOEXEC | O_IGNORE_CTTY;
   int fd;
 #if IS_IN (rtld)
   assert (dfd == AT_FDCWD);
diff --git a/sysdeps/pthread/sem_open.c b/sysdeps/pthread/sem_open.c
index e5db929d..5a248ebb 100644
--- a/sysdeps/pthread/sem_open.c
+++ b/sysdeps/pthread/sem_open.c
@@ -65,7 +65,7 @@ __sem_open (const char *name, int oflag, ...)
   /* If the semaphore object has to exist simply open it.  */
   if ((oflag & O_CREAT) == 0 || (oflag & O_EXCL) == 0)
     {
-      open_flags = O_RDWR | O_NOFOLLOW | O_CLOEXEC;
+      open_flags = O_RDWR | O_NOFOLLOW | O_CLOEXEC | O_IGNORE_CTTY;
       open_flags |= (oflag & ~(O_CREAT|O_ACCMODE));
     try_again:
       fd = __open (dirname.name, open_flags);
@@ -135,7 +135,7 @@ __sem_open (const char *name, int oflag, ...)
 	    }
 
 	  /* Open the file.  Make sure we do not overwrite anything.  */
-	  open_flags = O_RDWR | O_CREAT | O_EXCL | O_CLOEXEC;
+	  open_flags = O_RDWR | O_CREAT | O_EXCL | O_CLOEXEC | O_IGNORE_CTTY;
 	  fd = __open (tmpfname, open_flags, mode);
 	  if (fd == -1)
 	    {
diff --git a/sysdeps/unix/bsd/getpt.c b/sysdeps/unix/bsd/getpt.c
index 8369f958..48f3d07a 100644
--- a/sysdeps/unix/bsd/getpt.c
+++ b/sysdeps/unix/bsd/getpt.c
@@ -76,7 +76,7 @@ __bsd_openpt (int oflag)
 int
 __getpt (void)
 {
-  return __bsd_openpt (O_RDWR);
+  return __bsd_openpt (O_RDWR | O_IGNORE_CTTY);
 }
 libc_hidden_def (__getpt)
 weak_alias (__getpt, getpt)
@@ -84,6 +84,6 @@ weak_alias (__getpt, getpt)
 int
 __posix_openpt (int oflag)
 {
-  return __bsd_openpt (oflag);
+  return __bsd_openpt (oflag | O_IGNORE_CTTY);
 }
 weak_alias (__posix_openpt, posix_openpt)
