98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
/* dirfd.c -- return the file descriptor associated with an open DIR*
|
|
|
|
Copyright (C) 2001, 2006, 2008-2021 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/>. */
|
|
|
|
/* Written by Jim Meyering. */
|
|
|
|
#include <config.h>
|
|
|
|
#include <dirent.h>
|
|
#include <errno.h>
|
|
|
|
#ifdef __KLIBC__
|
|
# include <stdlib.h>
|
|
# include <io.h>
|
|
|
|
static struct dirp_fd_list
|
|
{
|
|
DIR *dirp;
|
|
int fd;
|
|
struct dirp_fd_list *next;
|
|
} *dirp_fd_start = NULL;
|
|
|
|
/* Register fd associated with dirp to dirp_fd_list. */
|
|
int
|
|
_gl_register_dirp_fd (int fd, DIR *dirp)
|
|
{
|
|
struct dirp_fd_list *new_dirp_fd = malloc (sizeof *new_dirp_fd);
|
|
if (!new_dirp_fd)
|
|
return -1;
|
|
|
|
new_dirp_fd->dirp = dirp;
|
|
new_dirp_fd->fd = fd;
|
|
new_dirp_fd->next = dirp_fd_start;
|
|
|
|
dirp_fd_start = new_dirp_fd;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Unregister fd from dirp_fd_list with closing it */
|
|
void
|
|
_gl_unregister_dirp_fd (int fd)
|
|
{
|
|
struct dirp_fd_list *dirp_fd;
|
|
struct dirp_fd_list *dirp_fd_prev;
|
|
|
|
for (dirp_fd_prev = NULL, dirp_fd = dirp_fd_start; dirp_fd;
|
|
dirp_fd_prev = dirp_fd, dirp_fd = dirp_fd->next)
|
|
{
|
|
if (dirp_fd->fd == fd)
|
|
{
|
|
if (dirp_fd_prev)
|
|
dirp_fd_prev->next = dirp_fd->next;
|
|
else /* dirp_fd == dirp_fd_start */
|
|
dirp_fd_start = dirp_fd_start->next;
|
|
|
|
close (fd);
|
|
free (dirp_fd);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
int
|
|
dirfd (DIR *dir_p)
|
|
{
|
|
int fd = DIR_TO_FD (dir_p);
|
|
if (fd == -1)
|
|
#ifndef __KLIBC__
|
|
errno = ENOTSUP;
|
|
#else
|
|
{
|
|
struct dirp_fd_list *dirp_fd;
|
|
|
|
for (dirp_fd = dirp_fd_start; dirp_fd; dirp_fd = dirp_fd->next)
|
|
if (dirp_fd->dirp == dir_p)
|
|
return dirp_fd->fd;
|
|
|
|
errno = EINVAL;
|
|
}
|
|
#endif
|
|
|
|
return fd;
|
|
}
|