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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 "dirstream.h"
libc_hidden_proto(opendir)
libc_hidden_proto(open)
libc_hidden_proto(fcntl)
libc_hidden_proto(close)
libc_hidden_proto(stat)
libc_hidden_proto(fstat)
/* 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
if ((fd = open(name, O_RDONLY|O_NDELAY|O_DIRECTORY)) < 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)
goto close_and_ret;
/* According to POSIX, directory streams should be closed when
* exec. From "Anna Pluzhnikov" <besp@midway.uchicago.edu>.
*/
if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0) {
int saved_errno;
close_and_ret:
saved_errno = errno;
close(fd);
__set_errno(saved_errno);
return NULL;
}
if (!(ptr = malloc(sizeof(*ptr))))
goto nomem_close_and_ret;
memset(ptr, '\0', sizeof(DIR));
ptr->dd_fd = fd;
ptr->dd_nextloc = ptr->dd_size = ptr->dd_nextoff = 0;
ptr->dd_max = statbuf.st_blksize;
if (ptr->dd_max < 512)
ptr->dd_max = 512;
if (!(ptr->dd_buf = calloc(1, ptr->dd_max))) {
free(ptr);
nomem_close_and_ret:
close(fd);
__set_errno(ENOMEM);
return NULL;
}
__pthread_mutex_init(&(ptr->dd_lock), NULL);
return ptr;
}
libc_hidden_def(opendir)
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