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/* Test for reading directories with getdents64.
Copyright (C) 2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <support/check.h>
#include <support/support.h>
#include <support/xunistd.h>
#include <unistd.h>
static int
do_test (void)
{
/* The test compares the iteration order with readdir64. */
DIR *reference = opendir (".");
TEST_VERIFY_EXIT (reference != NULL);
int fd = xopen (".", O_RDONLY | O_DIRECTORY, 0);
TEST_VERIFY (fd >= 0);
/* Perform two passes, with a rewind operating between passes. */
for (int pass = 0; pass < 2; ++pass)
{
/* Check that we need to fill the buffer multiple times. */
int read_count = 0;
while (true)
{
/* Simple way to make sure that the memcpy below does not read
non-existing data. */
struct
{
char buffer[1024];
struct dirent64 pad;
} data;
ssize_t ret = getdents64 (fd, &data.buffer, sizeof (data.buffer));
if (ret < 0)
FAIL_EXIT1 ("getdents64: %m");
if (ret == 0)
break;
++read_count;
char *current = data.buffer;
char *end = data.buffer + ret;
while (current != end)
{
struct dirent64 entry;
memcpy (&entry, current, sizeof (entry));
/* Truncate overlong strings. */
entry.d_name[sizeof (entry.d_name) - 1] = '\0';
TEST_VERIFY (strlen (entry.d_name) < sizeof (entry.d_name) - 1);
errno = 0;
struct dirent64 *refentry = readdir64 (reference);
if (refentry == NULL && errno == 0)
FAIL_EXIT1 ("readdir64 failed too early, at: %s",
entry.d_name);
else if (refentry == NULL)
FAIL_EXIT1 ("readdir64: %m");
TEST_COMPARE_STRING (entry.d_name, refentry->d_name);
TEST_COMPARE (entry.d_ino, refentry->d_ino);
TEST_COMPARE (entry.d_off, refentry->d_off);
TEST_COMPARE (entry.d_type, refentry->d_type);
/* Offset zero is reserved for the first entry. */
TEST_VERIFY (entry.d_off != 0);
TEST_VERIFY_EXIT (entry.d_reclen <= end - current);
current += entry.d_reclen;
}
}
/* We expect to have reached the end of the stream. */
errno = 0;
TEST_VERIFY (readdir64 (reference) == NULL);
TEST_COMPARE (errno, 0);
/* direntries_read has been called more than once. */
TEST_VERIFY (read_count > 0);
/* Rewind both directory streams. */
xlseek (fd, 0, SEEK_SET);
rewinddir (reference);
}
xclose (fd);
closedir (reference);
return 0;
}
#include <support/test-driver.c>
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