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/*
* Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
*
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/dir.h>
#include <sys/stat.h>
#include <dirent.h>
#include "dirstream.h"
static DIR *fd_to_DIR(int fd, __blksize_t size)
{
DIR *ptr;
ptr = malloc(sizeof(*ptr));
if (!ptr)
return NULL;
ptr->dd_fd = fd;
ptr->dd_nextloc = ptr->dd_size = ptr->dd_nextoff = 0;
ptr->dd_max = size;
if (ptr->dd_max < 512)
ptr->dd_max = 512;
ptr->dd_buf = calloc(1, ptr->dd_max);
if (!ptr->dd_buf) {
free(ptr);
return NULL;
}
__pthread_mutex_init(&ptr->dd_lock, NULL);
return ptr;
}
DIR *fdopendir(int fd)
{
int flags;
struct stat st;
if (fstat(fd, &st))
return NULL;
if (!S_ISDIR(st.st_mode)) {
__set_errno(ENOTDIR);
return NULL;
}
flags = fcntl(fd, F_GETFL);
if (flags == -1)
return NULL;
if ((flags & O_ACCMODE) == O_WRONLY) {
__set_errno(EINVAL);
return NULL;
}
return fd_to_DIR(fd, st.st_blksize);
}
/* opendir just makes an open() call - it return NULL if it fails
* (open sets errno), otherwise it returns a DIR * pointer.
*/
DIR *opendir(const char *name)
{
int fd;
struct stat statbuf;
DIR *ptr;
#ifndef O_DIRECTORY
/* O_DIRECTORY is linux specific and has been around since like 2.1.x */
if (stat(name, &statbuf))
return NULL;
if (!S_ISDIR(statbuf.st_mode)) {
__set_errno(ENOTDIR);
return NULL;
}
# define O_DIRECTORY 0
#endif
#ifndef O_CLOEXEC
# define O_CLOEXEC 0
#endif
fd = open(name, O_RDONLY|O_NDELAY|O_DIRECTORY|O_CLOEXEC);
if (fd < 0)
return NULL;
/* Note: we should check to make sure that between the stat() and open()
* call, 'name' didnt change on us, but that's only if O_DIRECTORY isnt
* defined and since Linux has supported it for like ever, i'm not going
* to worry about it right now (if ever). */
if (fstat(fd, &statbuf) < 0) {
// this close() never fails
//int saved_errno;
//saved_errno = errno;
close(fd);
//__set_errno(saved_errno);
return NULL;
}
/* According to POSIX, directory streams should be closed when
* exec. From "Anna Pluzhnikov" <besp@midway.uchicago.edu>.
*/
if (O_CLOEXEC == 0)
fcntl(fd, F_SETFD, FD_CLOEXEC);
ptr = fd_to_DIR(fd, statbuf.st_blksize);
if (!ptr) {
close(fd);
__set_errno(ENOMEM);
}
return ptr;
}
libc_hidden_def(opendir)
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