1 files changed, 59 insertions, 0 deletions
diff --git a/sysdeps/unix/bsd/setsid.c b/sysdeps/unix/bsd/setsid.c
new file mode 100644
index 0000000000..59594101cf
--- /dev/null
+++ b/sysdeps/unix/bsd/setsid.c
@@ -0,0 +1,59 @@
+/* Copyright (C) 1991, 1995 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <fcntl.h>
+
+/* Create a new session with the calling process as its leader.
+   The process group IDs of the session and the calling process
+   are set to the process ID of the calling process, which is returned.  */
+int
+DEFUN_VOID(__setsid)
+{
+  pid_t pid = getpid ();
+  int tty;
+  int save = errno;
+
+  if (__getpgrp (pid) == pid)
+    {
+      /* Already the leader.  */
+      errno = EPERM;
+      return -1;
+    }
+
+  if (setpgid (pid, pid) < 0)
+    return -1;
+
+  tty = open ("/dev/tty", 0);
+  if (tty < 0)
+    {
+      errno = save;
+      return 0;
+    }
+  (void) __ioctl (tty, TIOCNOTTY, 0);
+  (void) __close (tty);
+
+  errno = save;
+  return 0;
+}
+
+weak_alias (__setsid, setsid)