tests/test-ptsname.c

   1 /* Test of ptsname(3).
   2    Copyright (C) 2010-2020 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 #include <config.h>
  18
  19 #include <stdlib.h>
  20
  21 #include "signature.h"
  22 SIGNATURE_CHECK (ptsname, char *, (int));
  23
  24 #include <errno.h>
  25 #include <fcntl.h>
  26 #include <signal.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <unistd.h>
  30 #include <sys/stat.h>
  31
  32 #include "same-inode.h"
  33
  34 #include "macros.h"
  35
  36 /* Compare two slave names.
  37    On some systems, there are hard links in the /dev/ directory.
  38    For example, on OSF/1 5.1,
  39      /dev/ttyp0 == /dev/pts/0
  40      /dev/ttyp9 == /dev/pts/9
  41      /dev/ttypa == /dev/pts/10
  42      /dev/ttype == /dev/pts/14
  43  */
  44 static int
  45 same_slave (const char *slave_name1, const char *slave_name2)
  46 {
  47   struct stat statbuf1;
  48   struct stat statbuf2;
  49
  50   return (strcmp (slave_name1, slave_name2) == 0
  51           || (stat (slave_name1, &statbuf1) >= 0
  52               && stat (slave_name2, &statbuf2) >= 0
  53               && SAME_INODE (statbuf1, statbuf2)));
  54 }
  55
  56 int
  57 main (void)
  58 {
  59 #if HAVE_DECL_ALARM
  60   /* Declare failure if test takes too long, by using default abort
  61      caused by SIGALRM.  */
  62   int alarm_value = 5;
  63   signal (SIGALRM, SIG_DFL);
  64   alarm (alarm_value);
  65 #endif
  66
  67   {
  68     char *result;
  69
  70     errno = 0;
  71     result = ptsname (-1);
  72     ASSERT (result == NULL);
  73     ASSERT (errno == EBADF
  74             || errno == ENOTTY /* seen on glibc */
  75            );
  76   }
  77
  78   {
  79     int fd;
  80     char *result;
  81
  82     /* Open the controlling tty of the current process.  */
  83     fd = open ("/dev/tty", O_RDONLY);
  84     if (fd < 0)
  85       {
  86         fprintf (stderr, "Skipping test: cannot open controlling tty\n");
  87         return 77;
  88       }
  89
  90     result = ptsname (fd);
  91     /* The result is usually NULL, because /dev/tty is a slave, not a
  92        master.  */
  93     if (result != NULL)
  94       {
  95         ASSERT (memcmp (result, "/dev/", 5) == 0);
  96       }
  97
  98     close (fd);
  99   }
 100
 101 #if defined __sun
 102   /* Solaris has BSD-style /dev/pty[p-r][0-9a-f] files, but the function
 103      ptsname() does not work on them.  */
 104   {
 105     int fd;
 106     char *result;
 107
 108     /* Open the controlling tty of the current process.  */
 109     fd = open ("/dev/ptmx", O_RDWR | O_NOCTTY);
 110     if (fd < 0)
 111       {
 112         fprintf (stderr, "Skipping test: cannot open pseudo-terminal\n");
 113         return 77;
 114       }
 115
 116     result = ptsname (fd);
 117     ASSERT (result != NULL);
 118     ASSERT (memcmp (result, "/dev/pts/", 9) == 0);
 119
 120     close (fd);
 121   }
 122
 123 #else
 124
 125   /* Try various master names of Mac OS X: /dev/pty[p-w][0-9a-f]  */
 126   {
 127     int char1;
 128     int char2;
 129
 130     for (char1 = 'p'; char1 <= 'w'; char1++)
 131       for (char2 = '0'; char2 <= 'f'; (char2 == '9' ? char2 = 'a' : char2++))
 132         {
 133           char master_name[32];
 134           int fd;
 135
 136           sprintf (master_name, "/dev/pty%c%c", char1, char2);
 137           fd = open (master_name, O_RDONLY);
 138           if (fd >= 0)
 139             {
 140               char *result;
 141               char slave_name[32];
 142
 143               result = ptsname (fd);
 144               ASSERT (result != NULL);
 145               sprintf (slave_name, "/dev/tty%c%c", char1, char2);
 146               ASSERT (same_slave (result, slave_name));
 147
 148               close (fd);
 149             }
 150         }
 151   }
 152
 153   /* Try various master names of *BSD: /dev/pty[p-sP-S][0-9a-v]  */
 154   {
 155     int upper;
 156     int char1;
 157     int char2;
 158
 159     for (upper = 0; upper <= 1; upper++)
 160       for (char1 = (upper ? 'P' : 'p'); char1 <= (upper ? 'S' : 's'); char1++)
 161         for (char2 = '0'; char2 <= 'v'; (char2 == '9' ? char2 = 'a' : char2++))
 162           {
 163             char master_name[32];
 164             int fd;
 165
 166             sprintf (master_name, "/dev/pty%c%c", char1, char2);
 167             fd = open (master_name, O_RDONLY);
 168             if (fd >= 0)
 169               {
 170                 char *result;
 171                 char slave_name[32];
 172
 173                 result = ptsname (fd);
 174                 ASSERT (result != NULL);
 175                 sprintf (slave_name, "/dev/tty%c%c", char1, char2);
 176                 ASSERT (same_slave (result, slave_name));
 177
 178                 close (fd);
 179               }
 180           }
 181   }
 182
 183 #endif
 184
 185   return 0;
 186 }