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/* t-exechelp.c - Module test for exechelp.c
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* Copyright (C) 2009 Free Software Foundation, Inc.
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* This file is part of GnuPG.
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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print_open_fds (int *array)
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for (n=0; array[n] != -1; n++)
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printf ("open file descriptors: %d", n);
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for (n=0; array[n] != -1; n++)
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printf ("%d%s", array[n], array[n+1] == -1?"":" ");
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xget_all_open_fds (void)
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array = get_all_open_fds ();
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fprintf (stderr, "%s:%d: get_all_open_fds failed: %s\n",
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__FILE__, __LINE__, strerror (errno));
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/* That is a very crude test. To do a proper test we would need to
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fork a test process and best return information by some other means
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that file descriptors. */
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test_close_all_fds (void)
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int max_fd = get_max_fds ();
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int initial_count, count, n;
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snprintf (buffer, sizeof buffer, "/bin/ls -l /proc/%d/fd", (int)getpid ());
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printf ("max. file descriptors: %d\n", max_fd);
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array = xget_all_open_fds ();
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print_open_fds (array);
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for (initial_count=n=0; array[n] != -1; n++)
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/* Some dups to get more file descriptors and close one. */
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array = xget_all_open_fds ();
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print_open_fds (array);
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for (count=n=0; array[n] != -1; n++)
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if (count != initial_count+3)
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fprintf (stderr, "%s:%d: dup or close failed\n",
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/* Close the non standard ones. */
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close_all_fds (3, NULL);
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/* Get a list to check whether they are all closed. */
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array = xget_all_open_fds ();
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print_open_fds (array);
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for (count=n=0; array[n] != -1; n++)
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if (count > initial_count)
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fprintf (stderr, "%s:%d: not all files were closed\n",
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initial_count = count;
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/* Now let's check the realloc we use. We do this and the next
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tests only if we are allowed to open enought descriptors. */
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if (get_max_fds () > 32)
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int except[] = { 20, 23, 24, -1 };
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for (n=initial_count; n < 31; n++)
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array = xget_all_open_fds ();
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print_open_fds (array);
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for (n=0; n < 5; n++)
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array = xget_all_open_fds ();
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print_open_fds (array);
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/* Check whether the except list works. */
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close_all_fds (3, except);
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array = xget_all_open_fds ();
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print_open_fds (array);
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for (count=n=0; array[n] != -1; n++)
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if (count != initial_count + DIM(except)-1)
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fprintf (stderr, "%s:%d: close_all_fds failed\n",
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main (int argc, char **argv)
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if (argc && !strcmp (argv[0], "--verbose"))
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test_close_all_fds ();