install-reloc: Support multi-binary installation.

[gnulib.git] / lib / login_tty.c

diff --git a/lib/login_tty.c b/lib/login_tty.c
index 0403391..44f09f2 100644 (file)
--- a/lib/login_tty.c
+++ b/lib/login_tty.c
@@ -1,6 +1,6 @@
 /* Assign a given terminal as controlling terminal and as standard input,
    standard output, standard error of the current process.
-   Copyright (C) 2010 Free Software Foundation, Inc.
+   Copyright (C) 2010-2013 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -21,6 +21,7 @@
 
 #include <fcntl.h>
 #include <unistd.h>
+#include <sys/ioctl.h>
 
 int
 login_tty (int slave_fd)
@@ -31,15 +32,22 @@ login_tty (int slave_fd)
   setsid ();
 
   /* Make fd the controlling terminal for the current process.
-     On Solaris: A terminal becomes the controlling terminal of a session
-     if it is being open()ed, at a moment when
-       1. it is not already the controlling terminal of some session, and
-       2. the process that open()s it is a session leader that does not have
-          a controlling terminal.
-     We assume condition 1, try to ensure condition 2, and then open() it.  */
+     On BSD and OSF/1: There is ioctl TIOCSCTTY for this purpose.
+     On Solaris:
+       A terminal becomes the controlling terminal of a session
+       if it is being open()ed, at a moment when
+         1. it is not already the controlling terminal of some session, and
+         2. the process that open()s it is a session leader that does not have
+            a controlling terminal.
+       We assume condition 1, try to ensure condition 2, and then open() it.
+   */
   for (i = 0; i < 3; i++)
     if (i != slave_fd)
       close (i);
+#ifdef TIOCSCTTY
+  if (ioctl (slave_fd, TIOCSCTTY, NULL) < 0)
+    return -1;
+#else
   {
     char *slave_name;
     int dummy_fd;
@@ -52,8 +60,9 @@ login_tty (int slave_fd)
       return -1;
     close (dummy_fd);
   }
+#endif
 
-  /* Assign fd to the standard input, standard output, and standardd error of
+  /* Assign fd to the standard input, standard output, and standard error of
      the current process.  */
   for (i = 0; i < 3; i++)
     if (slave_fd != i)