io/bug-ftw4.c

   1 /* Test if ftw function doesn't leak fds.
   2    Copyright (C) 2003-2024 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 <fcntl.h>
  20 #include <ftw.h>
  21 #include <stdlib.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <sys/stat.h>
  25 #include <unistd.h>
  26
  27 static int cb_called;
  28
  29 static int
  30 cb (const char *name, const struct stat64 *st, int type)
  31 {
  32   return cb_called++ & 1;
  33 }
  34
  35 int
  36 main (void)
  37 {
  38   char name[32] = "/tmp/ftwXXXXXX", *p;
  39   int ret, i, result = 0, fd, fd1, fd2;
  40
  41   if (mkdtemp (name) == NULL)
  42     {
  43       printf ("Couldn't make temporary directory: %m\n");
  44       exit (EXIT_FAILURE);
  45     }
  46   p = strchr (name, '\0');
  47   strcpy (p, "/1");
  48   if (mkdir (name, 0755) < 0)
  49     {
  50       printf ("Couldn't make temporary subdirectory: %m\n");
  51       exit (EXIT_FAILURE);
  52     }
  53   *p = '\0';
  54
  55   ret = ftw64 (name, cb, 20);
  56   if (ret != 1)
  57     {
  58       printf ("ftw64 returned %d instead of 1", ret);
  59       result = 1;
  60     }
  61
  62   fd = open (name, O_RDONLY);
  63   if (fd < 0)
  64     {
  65       printf ("open failed: %m\n");
  66       result = 1;
  67     }
  68   fd1 = open (name, O_RDONLY);
  69   if (fd1 < 0)
  70     {
  71       printf ("open failed: %m\n");
  72       result = 1;
  73     }
  74   else
  75     close (fd1);
  76   if (fd >= 0)
  77     close (fd);
  78
  79   for (i = 0; i < 128; ++i)
  80     {
  81       ret = ftw64 (name, cb, 20);
  82       if (ret != 1)
  83         {
  84           printf ("ftw64 returned %d instead of 1", ret);
  85           result = 1;
  86         }
  87     }
  88
  89   fd = open (name, O_RDONLY);
  90   if (fd < 0)
  91     {
  92       printf ("open failed: %m\n");
  93       result = 1;
  94     }
  95   fd2 = open (name, O_RDONLY);
  96   if (fd2 < 0)
  97     {
  98       printf ("open failed: %m\n");
  99       result = 1;
 100     }
 101   else
 102     close (fd2);
 103   if (fd >= 0)
 104     close (fd);
 105
 106   if (fd2 >= fd1 + 128)
 107     {
 108       printf ("ftw64 leaking fds: %d -> %d\n", fd1, fd2);
 109       result = 1;
 110     }
 111
 112   if (cb_called != 129 * 2)
 113     {
 114       printf ("callback called %d times\n", cb_called);
 115       result = 1;
 116     }
 117
 118   strcpy (p, "/1");
 119   rmdir (name);
 120   *p = '\0';
 121   rmdir (name);
 122   return result;
 123 }