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Member "cpio-2.13/gnu/dirfd.c" (2 Jan 2017, 2325 Bytes) of package /linux/misc/cpio-2.13.tar.bz2:


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    1 /* dirfd.c -- return the file descriptor associated with an open DIR*
    2 
    3    Copyright (C) 2001, 2006, 2008-2017 Free Software Foundation, Inc.
    4 
    5    This program is free software: you can redistribute it and/or modify
    6    it under the terms of the GNU General Public License as published by
    7    the Free Software Foundation; either version 3 of the License, or
    8    (at your option) any later version.
    9 
   10    This program is distributed in the hope that it will be useful,
   11    but WITHOUT ANY WARRANTY; without even the implied warranty of
   12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   13    GNU General Public License for more details.
   14 
   15    You should have received a copy of the GNU General Public License
   16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
   17 
   18 /* Written by Jim Meyering. */
   19 
   20 #include <config.h>
   21 
   22 #include <dirent.h>
   23 #include <errno.h>
   24 
   25 #ifdef __KLIBC__
   26 # include <stdlib.h>
   27 # include <io.h>
   28 
   29 static struct dirp_fd_list
   30 {
   31   DIR *dirp;
   32   int fd;
   33   struct dirp_fd_list *next;
   34 } *dirp_fd_start = NULL;
   35 
   36 /* Register fd associated with dirp to dirp_fd_list. */
   37 int
   38 _gl_register_dirp_fd (int fd, DIR *dirp)
   39 {
   40   struct dirp_fd_list *new_dirp_fd = malloc (sizeof *new_dirp_fd);
   41   if (!new_dirp_fd)
   42     return -1;
   43 
   44   new_dirp_fd->dirp = dirp;
   45   new_dirp_fd->fd = fd;
   46   new_dirp_fd->next = dirp_fd_start;
   47 
   48   dirp_fd_start = new_dirp_fd;
   49 
   50   return 0;
   51 }
   52 
   53 /* Unregister fd from dirp_fd_list with closing it */
   54 void
   55 _gl_unregister_dirp_fd (int fd)
   56 {
   57   struct dirp_fd_list *dirp_fd;
   58   struct dirp_fd_list *dirp_fd_prev;
   59 
   60   for (dirp_fd_prev = NULL, dirp_fd = dirp_fd_start; dirp_fd;
   61        dirp_fd_prev = dirp_fd, dirp_fd = dirp_fd->next)
   62     {
   63       if (dirp_fd->fd == fd)
   64         {
   65           if (dirp_fd_prev)
   66             dirp_fd_prev->next = dirp_fd->next;
   67           else  /* dirp_fd == dirp_fd_start */
   68             dirp_fd_start = dirp_fd_start->next;
   69 
   70           close (fd);
   71           free (dirp_fd);
   72           break;
   73         }
   74     }
   75 }
   76 #endif
   77 
   78 int
   79 dirfd (DIR *dir_p)
   80 {
   81   int fd = DIR_TO_FD (dir_p);
   82   if (fd == -1)
   83 #ifndef __KLIBC__
   84     errno = ENOTSUP;
   85 #else
   86     {
   87       struct dirp_fd_list *dirp_fd;
   88 
   89       for (dirp_fd = dirp_fd_start; dirp_fd; dirp_fd = dirp_fd->next)
   90         if (dirp_fd->dirp == dir_p)
   91           return dirp_fd->fd;
   92 
   93       errno = EINVAL;
   94     }
   95 #endif
   96 
   97   return fd;
   98 }