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99 lines
2.3 KiB
C
99 lines
2.3 KiB
C
/* dirfd.c -- return the file descriptor associated with an open DIR*
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Copyright (C) 2001, 2006, 2008-2022 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Jim Meyering. */
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#include <config.h>
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#include <dirent.h>
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#include <errno.h>
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#ifdef __KLIBC__
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# include <stdlib.h>
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# include <io.h>
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static struct dirp_fd_list
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{
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DIR *dirp;
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int fd;
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struct dirp_fd_list *next;
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} *dirp_fd_start = NULL;
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/* Register fd associated with dirp to dirp_fd_list. */
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int
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_gl_register_dirp_fd (int fd, DIR *dirp)
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{
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struct dirp_fd_list *new_dirp_fd = malloc (sizeof *new_dirp_fd);
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if (!new_dirp_fd)
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return -1;
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new_dirp_fd->dirp = dirp;
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new_dirp_fd->fd = fd;
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new_dirp_fd->next = dirp_fd_start;
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dirp_fd_start = new_dirp_fd;
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return 0;
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}
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/* Unregister fd from dirp_fd_list with closing it */
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void
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_gl_unregister_dirp_fd (int fd)
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{
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struct dirp_fd_list *dirp_fd;
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struct dirp_fd_list *dirp_fd_prev;
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for (dirp_fd_prev = NULL, dirp_fd = dirp_fd_start; dirp_fd;
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dirp_fd_prev = dirp_fd, dirp_fd = dirp_fd->next)
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{
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if (dirp_fd->fd == fd)
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{
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if (dirp_fd_prev)
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dirp_fd_prev->next = dirp_fd->next;
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else /* dirp_fd == dirp_fd_start */
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dirp_fd_start = dirp_fd_start->next;
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close (fd);
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free (dirp_fd);
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break;
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}
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}
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}
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#endif
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int
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dirfd (DIR *dir_p)
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{
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int fd = DIR_TO_FD (dir_p);
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if (fd == -1)
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#ifndef __KLIBC__
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errno = ENOTSUP;
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#else
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{
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struct dirp_fd_list *dirp_fd;
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for (dirp_fd = dirp_fd_start; dirp_fd; dirp_fd = dirp_fd->next)
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if (dirp_fd->dirp == dir_p)
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return dirp_fd->fd;
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errno = EINVAL;
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}
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#endif
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return fd;
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}
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