io/tst-fcntl.c

   1 /* Tests for fcntl.
   2    Copyright (C) 2000-2015 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <errno.h>
  21 #include <fcntl.h>
  22 #include <paths.h>
  23 #include <string.h>
  24 #include <unistd.h>
  25 #include <sys/stat.h>
  26
  27
  28 /* Prototype for our test function.  */
  29 extern void do_prepare (int argc, char *argv[]);
  30 extern int do_test (int argc, char *argv[]);
  31
  32 /* We have a preparation function.  */
  33 #define PREPARE do_prepare
  34
  35 #include "../test-skeleton.c"
  36
  37
  38 /* Name of the temporary files.  */
  39 static char *name;
  40
  41 void
  42 do_prepare (int argc, char *argv[])
  43 {
  44    size_t name_len;
  45
  46    name_len = strlen (test_dir);
  47    name = malloc (name_len + sizeof ("/fcntlXXXXXX"));
  48    mempcpy (mempcpy (name, test_dir, name_len),
  49             "/fcntlXXXXXX", sizeof ("/fcntlXXXXXX"));
  50    add_temp_file (name);
  51 }
  52
  53
  54 int
  55 do_test (int argc, char *argv[])
  56 {
  57   int fd;
  58   int fd2;
  59   int fd3;
  60   struct stat64 st;
  61   int val;
  62   int result = 0;
  63
  64   /* Create the temporary file.  */
  65   fd = mkstemp (name);
  66   if (fd == -1)
  67     {
  68       printf ("cannot open temporary file: %m\n");
  69       return 1;
  70     }
  71   if (fstat64 (fd, &st) != 0)
  72     {
  73       printf ("cannot stat test file: %m\n");
  74       return 1;
  75     }
  76   if (! S_ISREG (st.st_mode) || st.st_size != 0)
  77     {
  78       puts ("file not created correctly");
  79       return 1;
  80     }
  81
  82   /* Get the flags with fcntl().  */
  83   val = fcntl (fd, F_GETFL);
  84   if (val == -1)
  85     {
  86       printf ("fcntl(fd, F_GETFL) failed: %m\n");
  87       result = 1;
  88     }
  89   else if ((val & O_ACCMODE) != O_RDWR)
  90     {
  91       puts ("temporary file not opened for read and write");
  92       result = 1;
  93     }
  94
  95   /* Set the flags to something else.  */
  96   if (fcntl (fd, F_SETFL, O_RDONLY) == -1)
  97     {
  98       printf ("fcntl(fd, F_SETFL, O_RDONLY) failed: %m\n");
  99       result = 1;
 100     }
 101
 102   val = fcntl (fd, F_GETFL);
 103   if (val == -1)
 104     {
 105       printf ("fcntl(fd, F_GETFL) after F_SETFL failed: %m\n");
 106       result = 1;
 107     }
 108   else if ((val & O_ACCMODE) != O_RDWR)
 109     {
 110       puts ("temporary file access mode changed");
 111       result = 1;
 112     }
 113
 114   /* Set the flags to something else.  */
 115   if (fcntl (fd, F_SETFL, O_APPEND) == -1)
 116     {
 117       printf ("fcntl(fd, F_SETFL, O_APPEND) failed: %m\n");
 118       result = 1;
 119     }
 120
 121   val = fcntl (fd, F_GETFL);
 122   if (val == -1)
 123     {
 124       printf ("fcntl(fd, F_GETFL) after second F_SETFL failed: %m\n");
 125       result = 1;
 126     }
 127   else if ((val & O_APPEND) == 0)
 128     {
 129       puts ("O_APPEND not set");
 130       result = 1;
 131     }
 132
 133   val = fcntl (fd, F_GETFD);
 134   if (val == -1)
 135     {
 136       printf ("fcntl(fd, F_GETFD) failed: %m\n");
 137       result = 1;
 138     }
 139   else if (fcntl (fd, F_SETFD, val | FD_CLOEXEC) == -1)
 140     {
 141       printf ("fcntl(fd, F_SETFD, FD_CLOEXEC) failed: %m\n");
 142       result = 1;
 143     }
 144   else
 145     {
 146       val = fcntl (fd, F_GETFD);
 147       if (val == -1)
 148         {
 149           printf ("fcntl(fd, F_GETFD) after F_SETFD failed: %m\n");
 150           result = 1;
 151         }
 152       else if ((val & FD_CLOEXEC) == 0)
 153         {
 154           puts ("FD_CLOEXEC not set");
 155           result = 1;
 156         }
 157     }
 158
 159   /* Get a number of a free descriptor.  If /dev/null is not available
 160      don't continue testing.  */
 161   fd2 = open (_PATH_DEVNULL, O_RDWR);
 162   if (fd2 == -1)
 163     return result;
 164   close (fd2);
 165
 166   fd3 = fcntl (fd, F_DUPFD, fd2 + 1);
 167   if (fd3 == -1)
 168     {
 169       printf ("fcntl(fd, F_DUPFD, %d) failed: %m\n", fd2 + 1);
 170       result = 1;
 171     }
 172   else if (fd3 <= fd2)
 173     {
 174       printf ("F_DUPFD returned %d which is not larger than %d\n", fd3, fd2);
 175       result = 1;
 176     }
 177
 178   if (fd3 != -1)
 179     {
 180       val = fcntl (fd3, F_GETFD);
 181       if (val == -1)
 182         {
 183           printf ("fcntl(fd3, F_GETFD) after F_DUPFD failed: %m\n");
 184           result = 1;
 185         }
 186       else if ((val & FD_CLOEXEC) != 0)
 187         {
 188           puts ("FD_CLOEXEC still set");
 189           result = 1;
 190         }
 191
 192       close (fd3);
 193     }
 194
 195   return result;
 196 }