diff options
Diffstat (limited to 'sysdeps/unix/bsd/telldir.c')
-rw-r--r-- | sysdeps/unix/bsd/telldir.c | 115 |
1 files changed, 0 insertions, 115 deletions
diff --git a/sysdeps/unix/bsd/telldir.c b/sysdeps/unix/bsd/telldir.c deleted file mode 100644 index 87e365315f..0000000000 --- a/sysdeps/unix/bsd/telldir.c +++ /dev/null @@ -1,115 +0,0 @@ -/* Copyright (C) 1994-2013 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 <errno.h> -#include <stddef.h> -#include <dirent.h> -#include <unistd.h> -#include <sys/types.h> -#include <stdlib.h> -#include "dirstream.h" - -/* Internal data structure for telldir and seekdir. */ -struct record - { - struct record *next; /* Link in chain. */ - off_t cookie; /* Value returned by `telldir'. */ - off_t pos; - size_t offset; - }; -#define NBUCKETS 32 -static struct record *records[32]; -static off_t lastpos; -__libc_lock_define_initialized(static, lock) /* Locks above data. */ - - -/* Return the current position of DIRP. */ -long int -telldir (dirp) - DIR *dirp; -{ - struct record *new; - long int pos; - - new = malloc (sizeof *new); - if (new == NULL) - return -1l; - - __libc_lock_lock (lock); - - new->pos = dirp->filepos; - new->offset = dirp->offset; - new->cookie = ++lastpos; - new->next = records[new->cookie % NBUCKETS]; - records[new->cookie % NBUCKETS] = new; - - pos = new->cookie; - - __libc_lock_unlock (lock); - - return pos; -} - - - -/* Seek to position POS in DIRP. */ -void -seekdir (dirp, pos) - DIR *dirp; - long int pos; -{ - struct record *r, **prevr; - - __libc_lock_lock (lock); - - for (prevr = &records[pos % NBUCKETS], r = *prevr; - r != NULL; - prevr = &r->next, r = r->next) - if (r->cookie == pos) - { - __libc_lock_lock (dirp->__lock); - if (dirp->filepos != r->pos || dirp->offset != r->offset) - { - dirp->size = 0; /* Must read a fresh buffer. */ - /* Move to the saved position. */ - __lseek (dirp->fd, r->pos, SEEK_SET); - dirp->filepos = r->pos; - dirp->offset = 0; - /* Read entries until we reach the saved offset. */ - while (dirp->offset < r->offset) - { - struct dirent *scan; - __libc_lock_unlock (dirp->__lock); - scan = readdir (dirp); - __libc_lock_lock (dirp->__lock); - if (! scan) - break; - } - } - __libc_lock_unlock (dirp->__lock); - - /* To prevent leaking memory, cookies returned from telldir - can only be used once. So free this one's record now. */ - *prevr = r->next; - free (r); - break; - } - - __libc_lock_unlock (lock); - - /* If we lost there is no way to indicate it. Oh well. */ -} |