LCOV - code coverage report
Current view: top level - common - t-exechelp.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 42 86 48.8 %
Date: 2016-11-29 15:00:56 Functions: 4 4 100.0 %

          Line data    Source code
       1             : /* t-exechelp.c - Module test for exechelp.c
       2             :  *      Copyright (C) 2009 Free Software Foundation, Inc.
       3             :  *
       4             :  * This file is part of GnuPG.
       5             :  *
       6             :  * GnuPG is free software; you can redistribute it and/or modify
       7             :  * it under the terms of the GNU General Public License as published by
       8             :  * the Free Software Foundation; either version 3 of the License, or
       9             :  * (at your option) any later version.
      10             :  *
      11             :  * GnuPG 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
      14             :  * GNU General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU General Public License
      17             :  * along with this program; if not, see <https://www.gnu.org/licenses/>.
      18             :  */
      19             : 
      20             : #include <config.h>
      21             : #include <stdio.h>
      22             : #include <stdlib.h>
      23             : #include <errno.h>
      24             : #include <assert.h>
      25             : #include <unistd.h>
      26             : 
      27             : #include "util.h"
      28             : #include "exechelp.h"
      29             : 
      30             : static int verbose;
      31             : 
      32             : 
      33             : static void
      34           1 : print_open_fds (int *array)
      35             : {
      36             :   int n;
      37             : 
      38           1 :   if (!verbose)
      39           2 :     return;
      40             : 
      41           0 :   for (n=0; array[n] != -1; n++)
      42             :     ;
      43           0 :   printf ("open file descriptors: %d", n);
      44           0 :   putchar (' ');
      45           0 :   putchar (' ');
      46           0 :   putchar ('(');
      47           0 :   for (n=0; array[n] != -1; n++)
      48           0 :     printf ("%d%s", array[n], array[n+1] == -1?"":" ");
      49           0 :   putchar (')');
      50           0 :   putchar ('\n');
      51             : }
      52             : 
      53             : 
      54             : static int *
      55           3 : xget_all_open_fds (void)
      56             : {
      57             :   int *array;
      58             : 
      59           3 :   array = get_all_open_fds ();
      60           3 :   if (!array)
      61             :     {
      62           0 :       fprintf (stderr, "%s:%d: get_all_open_fds failed: %s\n",
      63           0 :                __FILE__, __LINE__, strerror (errno));
      64           0 :       exit (1);
      65             :     }
      66           3 :   return array;
      67             : }
      68             : 
      69             : 
      70             : /* That is a very crude test.  To do a proper test we would need to
      71             :    fork a test process and best return information by some other means
      72             :    than file descriptors. */
      73             : static void
      74           1 : test_close_all_fds (void)
      75             : {
      76           1 :   int max_fd = get_max_fds ();
      77             :   int *array;
      78             :   int fd;
      79             :   int initial_count, count, n;
      80             : #if 0
      81             :   char buffer[100];
      82             : 
      83             :   snprintf (buffer, sizeof buffer, "/bin/ls -l /proc/%d/fd", (int)getpid ());
      84             :   system (buffer);
      85             : #endif
      86             : 
      87           1 :   if (verbose)
      88           0 :     printf ("max. file descriptors: %d\n", max_fd);
      89           1 :   array = xget_all_open_fds ();
      90           1 :   print_open_fds (array);
      91           4 :   for (initial_count=n=0; array[n] != -1; n++)
      92           3 :     initial_count++;
      93           1 :   free (array);
      94             : 
      95             :   /* Some dups to get more file descriptors and close one. */
      96           1 :   dup (1);
      97           1 :   dup (1);
      98           1 :   fd = dup (1);
      99           1 :   dup (1);
     100           1 :   close (fd);
     101             : 
     102           1 :   array = xget_all_open_fds ();
     103           1 :   if (verbose)
     104           0 :     print_open_fds (array);
     105           7 :   for (count=n=0; array[n] != -1; n++)
     106           6 :     count++;
     107           1 :   if (count != initial_count+3)
     108             :     {
     109           0 :       fprintf (stderr, "%s:%d: dup or close failed\n",
     110             :                __FILE__, __LINE__);
     111           0 :       exit (1);
     112             :     }
     113           1 :   free (array);
     114             : 
     115             :   /* Close the non standard ones.  */
     116           1 :   close_all_fds (3, NULL);
     117             : 
     118             :   /* Get a list to check whether they are all closed.  */
     119           1 :   array = xget_all_open_fds ();
     120           1 :   if (verbose)
     121           0 :     print_open_fds (array);
     122           4 :   for (count=n=0; array[n] != -1; n++)
     123           3 :     count++;
     124           1 :   if (count > initial_count)
     125             :     {
     126           0 :       fprintf (stderr, "%s:%d: not all files were closed\n",
     127             :                __FILE__, __LINE__);
     128           0 :       exit (1);
     129             :     }
     130           1 :   initial_count = count;
     131           1 :   free (array);
     132             : 
     133             :   /* Now let's check the realloc we use.  We do this and the next
     134             :      tests only if we are allowed to open enought descriptors.  */
     135           1 :   if (get_max_fds () > 32)
     136             :     {
     137           0 :       int except[] = { 20, 23, 24, -1 };
     138             : 
     139           0 :       for (n=initial_count; n < 31; n++)
     140           0 :         dup (1);
     141           0 :       array = xget_all_open_fds ();
     142           0 :       if (verbose)
     143           0 :         print_open_fds (array);
     144           0 :       free (array);
     145           0 :       for (n=0; n < 5; n++)
     146             :         {
     147           0 :           dup (1);
     148           0 :           array = xget_all_open_fds ();
     149           0 :           if (verbose)
     150           0 :             print_open_fds (array);
     151           0 :           free (array);
     152             :         }
     153             : 
     154             :       /* Check whether the except list works.  */
     155           0 :       close_all_fds (3, except);
     156           0 :       array = xget_all_open_fds ();
     157           0 :       if (verbose)
     158           0 :         print_open_fds (array);
     159           0 :       for (count=n=0; array[n] != -1; n++)
     160           0 :         count++;
     161           0 :       free (array);
     162             : 
     163           0 :       if (count != initial_count + DIM(except)-1)
     164             :         {
     165           0 :           fprintf (stderr, "%s:%d: close_all_fds failed\n",
     166             :                    __FILE__, __LINE__);
     167           0 :           exit (1);
     168             :         }
     169             :     }
     170             : 
     171           1 : }
     172             : 
     173             : 
     174             : int
     175           1 : main (int argc, char **argv)
     176             : {
     177           1 :   if (argc)
     178           1 :     { argc--; argv++; }
     179           1 :   if (argc && !strcmp (argv[0], "--verbose"))
     180             :     {
     181           0 :       verbose = 1;
     182           0 :       argc--; argv++;
     183             :     }
     184             : 
     185           1 :   test_close_all_fds ();
     186             : 
     187           1 :   return 0;
     188             : }

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