/* $OpenBSD: opendir.c,v 1.20 2010/01/19 17:12:43 millert Exp $ */ /* * Copyright (c) 1983, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include #include "telldir.h" /* * Open a directory. */ DIR * opendir(const char *name) { return (__opendir2(name, DTF_NODUP)); } DIR * __opendir2(const char *name, int flags) { DIR *dirp; int fd; struct stat sb; int pageoffset; if ((fd = open(name, O_RDONLY | O_NONBLOCK)) == -1) return (NULL); if (fstat(fd, &sb)) { close(fd); return (NULL); } if (!S_ISDIR(sb.st_mode)) { close(fd); errno = ENOTDIR; return (NULL); } if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1 || (dirp = malloc(sizeof(DIR) + sizeof(struct _telldir))) == NULL) { close(fd); return (NULL); } dirp->dd_td = (struct _telldir *)((char *)dirp + sizeof(DIR)); dirp->dd_td->td_locs = NULL; dirp->dd_td->td_sz = 0; dirp->dd_td->td_loccnt = 0; dirp->dd_td->td_last = 0; /* * Use a buffer that is page aligned. * Hopefully this can be a big win someday by allowing page trades * to user space to be done by getdirentries() */ pageoffset = getpagesize() - 1; dirp->dd_len = ((int)sb.st_blksize + pageoffset) & ~pageoffset; dirp->dd_buf = malloc((size_t)dirp->dd_len); if (dirp->dd_buf == NULL) { free(dirp); close(fd); return (NULL); } dirp->dd_seek = 0; dirp->dd_loc = 0; dirp->dd_fd = fd; dirp->dd_flags = flags; dirp->dd_lock = NULL; /* * Set up seek point for rewinddir. */ dirp->dd_rewind = telldir(dirp); return (dirp); }