regress/lib/libc/pty/ptmx/ptmx.c

   1 /*      $NetBSD: ptmx.c,v 1.4 2004/11/11 15:57:47 christos Exp $        */
   2
   3 /*-
   4  * Copyright (c) 2004 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Christos Zoulas.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31 #include <sys/cdefs.h>
  32 __RCSID("$NetBSD: ptmx.c,v 1.4 2004/11/11 15:57:47 christos Exp $");
  33
  34 #include <stdlib.h>
  35 #include <unistd.h>
  36 #include <grp.h>
  37 #include <errno.h>
  38 #include <fcntl.h>
  39 #include <sys/stat.h>
  40
  41 /*
  42  * On NetBSD /dev/ptyp0 == /dev/pts/0 so we can check for major
  43  * and minor device numbers. This check is non-portable. This
  44  * check is now disabled because we might not have /dev/ptyp0
  45  * at all.
  46  */
  47 #undef PTY_DEVNO_CHECK
  48
  49 int
  50 main(int argc, char *argv[])
  51 {
  52         struct stat stm, sts;
  53         char *pty;
  54         int fdm, fds;
  55         struct group *gp;
  56
  57         if ((fdm = posix_openpt(O_RDWR|O_NOCTTY)) == -1) {
  58                 if (errno == ENOENT || errno == ENODEV)
  59                         return 0;
  60                 err(1, "open master");
  61         }
  62
  63         if (fstat(fdm, &stm) == -1)
  64                 err(1, "fstat master");
  65
  66 #ifdef PTY_DEVNO_CHECK
  67         if (stat("/dev/ptyp0", &sts) == -1)
  68                 err(1, "stat `%s'", /dev/ptyp0);
  69
  70         if (major(stm.st_rdev) != major(sts.st_rdev))
  71                 errx(1, "bad master major number %d", major(stm.st_rdev));
  72 #endif
  73
  74         if (grantpt(fdm) == -1)
  75                 err(1, "grantpt");
  76
  77         if (unlockpt(fdm) == -1)
  78                 err(1, "unlockpt");
  79
  80         if ((pty = ptsname(fdm)) == NULL)
  81                 err(1, "ptsname");
  82
  83         if ((fds = open(pty, O_RDWR|O_NOCTTY)) == -1)
  84                 err(1, "open slave");
  85
  86         if (fstat(fds, &sts) == -1)
  87                 err(1, "fstat slave");
  88
  89 #ifdef PTY_DEVNO_CHECK
  90         if (minor(stm.st_rdev) != minor(sts.st_rdev))
  91                 errx(1, "bad slave minor number %d", major(stm.st_rdev));
  92 #endif
  93
  94         if (sts.st_uid != getuid())
  95                 errx(1, "bad slave uid %lu != %lu", (unsigned long)stm.st_uid,
  96                     getuid());
  97
  98         if ((gp = getgrnam("tty")) == NULL)
  99                 errx(1, "cannot find `tty' group");
 100
 101         if (sts.st_gid != gp->gr_gid)
 102                 errx(1, "bad slave gid %lu != %lu", (unsigned long)stm.st_gid,
 103                     gp->gr_gid);
 104         return 0;
 105 }