ldd: never run file directly
[glibc.git] / login / login_tty.c
bloba94f5cb861d1b36ac6004e523ef50806d0fcedc1
1 /*-
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
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.
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.
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 */
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>
41 int
42 login_tty (int fd)
44 (void) setsid();
45 #ifdef TIOCSCTTY
46 if (ioctl(fd, TIOCSCTTY, (char *)NULL) == -1)
47 return (-1);
48 #else
50 /* This might work. */
51 char *fdname = ttyname (fd);
52 int newfd;
53 if (fdname)
55 if (fd != 0)
56 (void) close (0);
57 if (fd != 1)
58 (void) close (1);
59 if (fd != 2)
60 (void) close (2);
61 newfd = open (fdname, O_RDWR);
62 (void) close (newfd);
65 #endif
66 while (dup2(fd, 0) == -1 && errno == EBUSY)
68 while (dup2(fd, 1) == -1 && errno == EBUSY)
70 while (dup2(fd, 2) == -1 && errno == EBUSY)
72 if (fd > 2)
73 (void) close(fd);
74 return (0);
76 libutil_hidden_def (login_tty)