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dirent: Add tst-rewinddir
It verifies that rewinddir allows restarting the directory iteration. Reviewed-by: DJ Delorie <dj@redhat.com>
This commit is contained in:
Florian Weimer
parent
4ec355af45
commit
6aa1645f66
@ -62,6 +62,7 @@ tests := \
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tst-fdopendir \
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tst-fdopendir2 \
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tst-readdir-long \
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tst-rewinddir \
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tst-scandir \
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tst-scandir64 \
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tst-seekdir \
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207
dirent/tst-rewinddir.c
Normal file
207
dirent/tst-rewinddir.c
Normal file
@ -0,0 +1,207 @@
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/* Test for rewinddir, using FUSE.
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <dirent.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <support/check.h>
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#include <support/fuse.h>
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#include <support/readdir.h>
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#include <support/support.h>
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#include <support/xdirent.h>
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/* Return the file name at the indicated directory offset. */
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static char *
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name_at_offset (unsigned int offset)
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{
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if (offset <= 1)
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return xstrdup (".." + !offset); /* "." or "..". */
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else
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/* Pad the name with a lot of zeros, so that the dirent buffer gets
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filled more quickly. */
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return xasprintf ("file%0240u", offset);
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}
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/* This many directory entries, including "." and "..". */
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enum { directory_entries = 200 };
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/* Add the directory entry at OFFSET to the stream D. */
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static uint64_t
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add_directory_entry (struct support_fuse_dirstream *d, uint64_t offset)
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{
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if (offset >= directory_entries)
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return 0;
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char *name = name_at_offset (offset);
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uint64_t ino = 1000 + offset; /* Arbitrary value, distinct from 1. */
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uint32_t type = DT_REG;
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if (offset <= 1)
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{
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type = DT_DIR;
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ino = 1;
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}
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++offset;
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bool added = support_fuse_dirstream_add (d, ino, offset, type, name);
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free (name);
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if (added)
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return offset;
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else
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return 0;
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}
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/* Set to true if getdents64 should produce only one entry. */
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static bool one_entry_per_getdents64;
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static void
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fuse_thread (struct support_fuse *f, void *closure)
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{
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struct fuse_in_header *inh;
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while ((inh = support_fuse_next (f)) != NULL)
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{
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if (support_fuse_handle_mountpoint (f)
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|| (inh->nodeid == 1 && support_fuse_handle_directory (f)))
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continue;
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switch (inh->opcode)
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{
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case FUSE_READDIR:
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if (inh->nodeid == 1)
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{
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uint64_t offset = support_fuse_cast (READ, inh)->offset;
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struct support_fuse_dirstream *d
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= support_fuse_prepare_readdir (f);
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while (true)
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{
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offset = add_directory_entry (d, offset);
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if (offset == 0 || one_entry_per_getdents64)
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break;
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}
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support_fuse_reply_prepared (f);
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}
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else
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support_fuse_reply_error (f, EIO);
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break;
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default:
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FAIL ("unexpected event %s", support_fuse_opcode (inh->opcode));
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support_fuse_reply_error (f, EIO);
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}
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}
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}
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/* Lists the entire directory from start to end. */
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static void
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verify_directory (DIR *dir, enum support_readdir_op op)
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{
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struct support_dirent e = { 0, };
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TEST_VERIFY (support_readdir (dir, op, &e));
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TEST_COMPARE_STRING (e.d_name, ".");
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TEST_VERIFY (support_readdir (dir, op, &e));
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TEST_COMPARE_STRING (e.d_name, "..");
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for (int i = 2; i < directory_entries; ++i)
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{
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char *expected = name_at_offset (i);
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TEST_VERIFY (support_readdir (dir, op, &e));
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TEST_COMPARE_STRING (e.d_name, expected);
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free (expected);
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}
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TEST_VERIFY (!support_readdir (dir, op, &e));
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free (e.d_name);
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}
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/* Run tests with rewinding after ENTRIES readdir calls. */
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static void
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rewind_after (unsigned int rewind_at)
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{
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for (enum support_readdir_op op = 0; op <= support_readdir_op_last (); ++op)
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{
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printf ("info: testing %s (rewind_at=%u)\n",
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support_readdir_function (op), rewind_at);
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struct support_fuse *f = support_fuse_mount (fuse_thread, NULL);
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DIR *dir = xopendir (support_fuse_mountpoint (f));
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struct support_dirent e = { 0, };
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switch (rewind_at)
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{
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case 0:
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break;
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case 1:
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TEST_VERIFY (support_readdir (dir, op, &e));
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TEST_COMPARE_STRING (e.d_name, ".");
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break;
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default:
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TEST_VERIFY (support_readdir (dir, op, &e));
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TEST_COMPARE_STRING (e.d_name, ".");
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TEST_VERIFY (support_readdir (dir, op, &e));
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TEST_COMPARE_STRING (e.d_name, "..");
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for (int i = 2; i < directory_entries; ++i)
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{
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if (i == rewind_at)
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break;
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char *expected = name_at_offset (i);
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TEST_VERIFY (support_readdir (dir, op, &e));
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TEST_COMPARE_STRING (e.d_name, expected);
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free (expected);
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}
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break;
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}
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errno = 0;
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rewinddir (dir);
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TEST_COMPARE (errno, 0);
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verify_directory (dir, op);
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free (e.d_name);
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xclosedir (dir);
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support_fuse_unmount (f);
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}
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}
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static int
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do_test (void)
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{
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support_fuse_init ();
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/* One pass without rewinding to verify that the generated directory
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content matches expectations. */
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{
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struct support_fuse *f = support_fuse_mount (fuse_thread, NULL);
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DIR *dir = xopendir (support_fuse_mountpoint (f));
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verify_directory (dir, SUPPORT_READDIR64);
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xclosedir (dir);
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support_fuse_unmount (f);
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}
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for (int do_unbuffered = 0; do_unbuffered < 2; ++do_unbuffered)
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{
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one_entry_per_getdents64 = do_unbuffered;
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for (int i = 0; i < 20; ++i)
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rewind_after (i);
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rewind_after (50);
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rewind_after (100);
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rewind_after (150);
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rewind_after (180);
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rewind_after (199);
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}
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return 0;
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}
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#include <support/test-driver.c>
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