login/tst-grantpt.c

   1 /* Test for grantpt, unlockpt error corner cases.
   2    Copyright (C) 2001-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <sys/types.h>
  20 #include <sys/stat.h>
  21 #include <fcntl.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <errno.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27 #include <support/check.h>
  28 #include <support/temp_file.h>
  29 #include <support/xunistd.h>
  30
  31 /* Test grantpt, unlockpt with a closed descriptor.  */
  32 static void
  33 test_ebadf (void)
  34 {
  35   int fd, ret, err;
  36
  37   fd = posix_openpt (O_RDWR);
  38   if (fd == -1)
  39     FAIL_EXIT1 ("posix_openpt(O_RDWR) failed\nerrno %d (%m)\n", errno);
  40   TEST_COMPARE (unlockpt (fd), 0);
  41
  42   xclose (fd);
  43   ret = grantpt (fd);
  44   err = errno;
  45   if (ret != -1 || err != EBADF)
  46     {
  47       support_record_failure ();
  48       printf ("grantpt(): expected: return = %d, errno = %d\n", -1, EBADF);
  49       printf ("           got: return = %d, errno = %d\n", ret, err);
  50     }
  51
  52   TEST_COMPARE (unlockpt (fd), -1);
  53   TEST_COMPARE (errno, EBADF);
  54 }
  55
  56 /* Test grantpt, unlockpt on a regular file.  */
  57 static void
  58 test_einval (void)
  59 {
  60   int fd, ret, err;
  61
  62   fd = create_temp_file ("tst-grantpt-", NULL);
  63   TEST_VERIFY_EXIT (fd >= 0);
  64
  65   ret = grantpt (fd);
  66   err = errno;
  67   if (ret != -1 || err != EINVAL)
  68     {
  69       support_record_failure ();
  70       printf ("grantpt(): expected: return = %d, errno = %d\n", -1, EINVAL);
  71       printf ("           got: return = %d, errno = %d\n", ret, err);
  72     }
  73
  74   TEST_COMPARE (unlockpt (fd), -1);
  75   TEST_COMPARE (errno, EINVAL);
  76
  77   xclose (fd);
  78 }
  79
  80 /* Test grantpt, unlockpt on a non-ptmx pseudo-terminal.  */
  81 static void
  82 test_not_ptmx (void)
  83 {
  84   int ptmx = posix_openpt (O_RDWR);
  85   TEST_VERIFY_EXIT (ptmx >= 0);
  86   TEST_COMPARE (grantpt (ptmx), 0);
  87   TEST_COMPARE (unlockpt (ptmx), 0);
  88
  89   /* A second unlock succeeds as well.  */
  90   TEST_COMPARE (unlockpt (ptmx), 0);
  91
  92   const char *name = ptsname (ptmx);
  93   TEST_VERIFY_EXIT (name != NULL);
  94   int pts = open (name, O_RDWR | O_NOCTTY);
  95   TEST_VERIFY_EXIT (pts >= 0);
  96
  97   TEST_COMPARE (grantpt (pts), -1);
  98   TEST_COMPARE (errno, EINVAL);
  99
 100   TEST_COMPARE (unlockpt (pts), -1);
 101   TEST_COMPARE (errno, EINVAL);
 102
 103   xclose (pts);
 104   xclose (ptmx);
 105 }
 106
 107 static int
 108 do_test (void)
 109 {
 110   test_ebadf ();
 111   test_einval ();
 112   test_not_ptmx ();
 113   return 0;
 114 }
 115
 116 #include <support/test-driver.c>