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/* Test the fts function.
Copyright 2017-2023 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#include <fts_.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#define BASE "t-fts.tmp"
static char base[] = BASE; /* Not const, since argv needs non-const. */
static char const base_d[] = BASE "/d";
static char *const argv[2] = { base, 0 };
static void
perror_exit (char const *message, int status)
{
perror (message);
exit (status);
}
/* alloc/dealloc to ensure structures initialized appropriately. */
static void
fts_dealloc (void)
{
static char dir[] = "./";
static char *const curr_dir[2] = { dir, 0 };
FTS *ftsp = fts_open (curr_dir, FTS_NOSTAT | FTS_PHYSICAL | FTS_CWDFD, 0);
if (ftsp)
{
if (fts_close (ftsp) != 0)
perror_exit ("fts_close", 9);
}
else
perror_exit (base, 10);
}
/* Remove BASE and all files under it. */
static void
remove_tree (void)
{
FTSENT *e;
FTS *ftsp = fts_open (argv, FTS_NOSTAT | FTS_PHYSICAL | FTS_CWDFD, 0);
if (ftsp)
{
while ((e = fts_read (ftsp)))
{
int status = 0;
switch (e->fts_info)
{
case FTS_DP:
status = unlinkat (ftsp->fts_cwd_fd, e->fts_accpath,
AT_REMOVEDIR);
break;
case FTS_F: case FTS_NSOK:
status = unlinkat (ftsp->fts_cwd_fd, e->fts_accpath, 0);
break;
}
if (status != 0)
perror_exit (e->fts_path, 1);
}
if (fts_close (ftsp) != 0)
perror_exit ("fts_close", 2);
}
else if (errno != ENOENT)
perror_exit (base, 3);
}
int
main (void)
{
FTS *ftsp;
FTSENT *e;
char buf[sizeof BASE + 100];
int i;
enum { needles = 4 };
int needles_seen = 0;
struct stat st;
remove_tree ();
/* Create directories BASE, BASE/d, BASE/d/1, BASE/d/2, ..., BASE/d/65536,
to stress-test fts. Stop if directory creation fails due to
EMFILE or EMLINK problems, or if BASE/d's link count no longer matches the
Unix tradition. See:
https://bugzilla.kernel.org/show_bug.cgi?id=196405
for more info. */
if (mkdir (BASE, 0777) != 0)
perror_exit (base, 4);
if (mkdir (base_d, 0777) != 0)
perror_exit (base_d, 5);
for (i = 1; i <= 65536; i++)
{
sprintf (buf, "%s/d/%i", base, i);
if (mkdir (buf, 0777) != 0)
{
if (errno == EMFILE || errno == EMLINK)
break;
if (i <= needles)
perror_exit (buf, 77);
break;
}
if (needles < i && stat (base_d, &st) == 0 && st.st_nlink != i + 2)
break;
}
/* Create empty files BASE/d/1/needle etc. */
for (i = 1; i <= needles; i++)
{
int fd;
sprintf (buf, "%s/d/%d/needle", base, i);
fd = open (buf, O_WRONLY | O_CREAT, 0666);
if (fd < 0 || close (fd) != 0)
perror_exit (buf, 77);
}
/* Use fts to look for the needles. */
ftsp = fts_open (argv, FTS_SEEDOT | FTS_NOSTAT | FTS_PHYSICAL | FTS_CWDFD, 0);
if (!ftsp)
perror_exit (base, 6);
while ((e = fts_read (ftsp)))
needles_seen += strcmp (e->fts_name, "needle") == 0;
int fts_read_errno = errno;
fflush (stdout);
if (fts_read_errno)
{
errno = fts_read_errno;
perror_exit ("fts_read", 7);
}
if (fts_close (ftsp) != 0)
perror_exit (base, 8);
/* Report an error if we did not find the needles. */
if (needles_seen != needles)
{
fprintf (stderr, "%d needles found (should be %d)\n",
needles_seen, needles);
return 1;
}
remove_tree ();
if (stat (base, &st) == 0)
{
fprintf (stderr, "fts could not remove directory\n");
return 1;
}
fts_dealloc ();
return 0;
}
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