1: /*-
    2:  * Copyright (c) 1990, 1993
    3:  *      The Regents of the University of California.  All rights reserved.
    4:  *
    5:  * Redistribution and use in source and binary forms, with or without
    6:  * modification, are permitted provided that the following conditions
    7:  * are met:
    8:  * 1. Redistributions of source code must retain the above copyright
    9:  *    notice, this list of conditions and the following disclaimer.
   10:  * 2. Redistributions in binary form must reproduce the above copyright
   11:  *    notice, this list of conditions and the following disclaimer in the
   12:  *    documentation and/or other materials provided with the distribution.
   13:  * 4. Neither the name of the University nor the names of its contributors
   14:  *    may be used to endorse or promote products derived from this software
   15:  *    without specific prior written permission.
   16:  *
   17:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27:  * SUCH DAMAGE.
   28:  */
   29: 
   30: #if defined(LIBC_SCCS) && !defined(lint)
   31: static char sccsid[] = "@(#)login_tty.c 8.1 (Berkeley) 6/4/93";
   32: #endif /* LIBC_SCCS and not lint */
   33: 
   34: #include <errno.h>
   35: #include <sys/param.h>
   36: #include <sys/ioctl.h>
   37: #include <unistd.h>
   38: #include <fcntl.h>
   39: #include <utmp.h>
   40: 
   41: int
   42: login_tty(fd)
   43:         int fd;
   44: {
   45:         (void) setsid();
   46: #ifdef TIOCSCTTY
   47:         if (ioctl(fd, TIOCSCTTY, (char *)NULL) == -1)
   48:                 return (-1);
   49: #else
   50:         {
   51:           /* This might work.  */
   52:           char *fdname = ttyname (fd);
   53:           int newfd;
   54:           if (fdname)
   55:             {
   56:               if (fd != 0)
   57:                 (void) close (0);
   58:               if (fd != 1)
   59:                 (void) close (1);
   60:               if (fd != 2)
   61:                 (void) close (2);
   62:               newfd = open (fdname, O_RDWR);
   63:               (void) close (newfd);
   64:             }
   65:         }
   66: #endif
   67:         while (dup2(fd, 0) == -1 && errno == EBUSY)
   68:           ;
   69:         while (dup2(fd, 1) == -1 && errno == EBUSY)
   70:           ;
   71:         while (dup2(fd, 2) == -1 && errno == EBUSY)
   72:           ;
   73:         if (fd > 2)
   74:                 (void) close(fd);
   75:         return (0);
   76: }
   77: libutil_hidden_def (login_tty)