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newlib/winsup/cygwin/dir.cc
Corinna Vinschen ecdee6e98a * dir.cc (opendir): Fix indentation. 
* fhandler_disk_file.cc (fhandler_disk_file::opendir): Move storing
	fhandler in file descriptor table to some point very late in function
	to avoid double free'ing.  Add comment to explain what happens.
	Add label free_mounts and don't forget to delete __DIR_mounts structure
	if NtOpenFile fails.
2006-03-03 20:19:26 +00:00

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6.7 KiB
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/* dir.cc: Posix directory-related routines
Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2006 Red Hat, Inc.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include <unistd.h>
#include <stdlib.h>
#include <sys/stat.h>
#define _COMPILING_NEWLIB
#include <dirent.h>
#include "pinfo.h"
#include "cygerrno.h"
#include "security.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "cygtls.h"
#include "perprocess.h"
#include "cygwin/version.h"
extern "C" int
dirfd (DIR *dir)
{
myfault efault;
if (efault.faulted (EFAULT))
return -1;
if (dir->__d_cookie != __DIRENT_COOKIE)
{
set_errno (EBADF);
syscall_printf ("-1 = dirfd (%p)", dir);
return -1;
}
return dir->__d_fd;
}
/* Symbol kept for backward compatibility. Don't remove. Don't declare
in public header file. */
extern "C" DIR *
__opendir_with_d_ino (const char *name)
{
return opendir (name);
}
/* opendir: POSIX 5.1.2.1 */
extern "C" DIR *
opendir (const char *name)
{
fhandler_base *fh;
DIR *res;
fh = build_fh_name (name, NULL, PC_SYM_FOLLOW);
if (!fh)
res = NULL;
else if (fh->exists ())
res = fh->opendir ();
else
{
set_errno (ENOENT);
res = NULL;
}
if (!res && fh)
delete fh;
return res;
}
static int
readdir_worker (DIR *dir, dirent *de)
{
myfault efault;
if (efault.faulted ())
return EFAULT;
if (dir->__d_cookie != __DIRENT_COOKIE)
{
syscall_printf ("%p = readdir (%p)", NULL, dir);
return EBADF;
}
de->d_ino = 0;
int res = ((fhandler_base *) dir->__fh)->readdir (dir, de);
if (res == ENMFILE)
{
if (!(dir->__flags & dirent_saw_dot))
{
strcpy (de->d_name, ".");
dir->__flags |= dirent_saw_dot;
dir->__d_position++;
res = 0;
}
else if (!(dir->__flags & dirent_saw_dot_dot))
{
strcpy (de->d_name, "..");
dir->__flags |= dirent_saw_dot_dot;
dir->__d_position++;
res = 0;
}
}
if (!res && !de->d_ino)
{
bool is_dot = false;
bool is_dot_dot = false;
if (de->d_name[0] == '.')
{
if (de->d_name[1] == '\0')
is_dot = true;
else if (de->d_name[1] == '.' && de->d_name[2] == '\0')
is_dot_dot = true;
}
if (is_dot_dot && !(dir->__flags & dirent_isroot))
de->d_ino = readdir_get_ino (dir,
((fhandler_base *) dir->__fh)->get_name (),
true);
else
{
/* Compute d_ino by combining filename hash with directory hash. */
de->d_ino = ((fhandler_base *) dir->__fh)->get_namehash ();
if (!is_dot && !is_dot_dot)
{
const char *w32name = ((fhandler_base *) dir->__fh)->get_win32_name ();
DWORD devn = ((fhandler_base *) dir->__fh)->get_device ();
/* Paths below /proc don't have a Win32 pendant. */
if (devn == FH_PROC || devn == FH_PROCESS || devn == FH_REGISTRY)
de->d_ino = hash_path_name (de->d_ino, "/");
/* A drive's root dir has a trailing backslash already. */
else if (w32name[1] != ':' || w32name[2] != '\\' || w32name[3])
de->d_ino = hash_path_name (de->d_ino, "\\");
de->d_ino = hash_path_name (de->d_ino, de->d_name);
}
}
}
/* This fills out the old 32 bit d_ino field for old applications,
build under Cygwin before 1.5.x. */
de->__d_internal1 = de->d_ino;
return res;
}
/* readdir: POSIX 5.1.2.1 */
extern "C" struct dirent *
readdir (DIR *dir)
{
int res = readdir_worker (dir, dir->__d_dirent);
if (res == 0)
return dir->__d_dirent;
if (res != ENMFILE)
set_errno (res);
return NULL;
}
extern "C" int
readdir_r (DIR *dir, dirent *de, dirent **ode)
{
int res = readdir_worker (dir, de);
if (!res)
*ode = de;
else
{
*ode = NULL;
if (res == ENMFILE)
res = 0;
}
return res;
}
extern "C" _off64_t
telldir64 (DIR *dir)
{
myfault efault;
if (efault.faulted (EFAULT))
return -1;
if (dir->__d_cookie != __DIRENT_COOKIE)
return 0;
return ((fhandler_base *) dir->__fh)->telldir (dir);
}
/* telldir */
extern "C" _off_t
telldir (DIR *dir)
{
return telldir64 (dir);
}
extern "C" void
seekdir64 (DIR *dir, _off64_t loc)
{
myfault efault;
if (efault.faulted (EFAULT))
return;
if (dir->__d_cookie != __DIRENT_COOKIE)
return;
dir->__flags &= (dirent_isroot | dirent_get_d_ino | dirent_set_d_ino);
return ((fhandler_base *) dir->__fh)->seekdir (dir, loc);
}
/* seekdir */
extern "C" void
seekdir (DIR *dir, _off_t loc)
{
seekdir64 (dir, (_off64_t)loc);
}
/* rewinddir: POSIX 5.1.2.1 */
extern "C" void
rewinddir (DIR *dir)
{
myfault efault;
if (efault.faulted (EFAULT))
return;
if (dir->__d_cookie != __DIRENT_COOKIE)
return;
dir->__flags &= (dirent_isroot | dirent_get_d_ino | dirent_set_d_ino);
return ((fhandler_base *) dir->__fh)->rewinddir (dir);
}
/* closedir: POSIX 5.1.2.1 */
extern "C" int
closedir (DIR *dir)
{
myfault efault;
if (efault.faulted (EFAULT))
return -1;
if (dir->__d_cookie != __DIRENT_COOKIE)
{
set_errno (EBADF);
syscall_printf ("-1 = closedir (%p)", dir);
return -1;
}
/* Reset the marker in case the caller tries to use `dir' again. */
dir->__d_cookie = 0;
int res = ((fhandler_base *) dir->__fh)->closedir (dir);
cygheap->fdtab.release (dir->__d_fd);
free (dir->__d_dirname);
free (dir->__d_dirent);
free (dir);
syscall_printf ("%d = closedir (%p)", res);
return res;
}
/* mkdir: POSIX 5.4.1.1 */
extern "C" int
mkdir (const char *dir, mode_t mode)
{
int res = -1;
fhandler_base *fh = NULL;
myfault efault;
if (efault.faulted (EFAULT))
return -1;
if (!(fh = build_fh_name (dir, NULL, PC_SYM_NOFOLLOW)))
goto done; /* errno already set */;
if (fh->error ())
{
debug_printf ("got %d error from build_fh_name", fh->error ());
set_errno (fh->error ());
}
else if (has_dot_last_component (dir))
set_errno (fh->exists () ? EEXIST : ENOENT);
else if (!fh->mkdir (mode))
res = 0;
delete fh;
done:
syscall_printf ("%d = mkdir (%s, %d)", res, dir, mode);
return res;
}
/* rmdir: POSIX 5.5.2.1 */
extern "C" int
rmdir (const char *dir)
{
int res = -1;
fhandler_base *fh = NULL;
myfault efault;
if (efault.faulted (EFAULT))
return -1;
if (!(fh = build_fh_name (dir, NULL, PC_SYM_NOFOLLOW)))
goto done; /* errno already set */;
if (fh->error ())
{
debug_printf ("got %d error from build_fh_name", fh->error ());
set_errno (fh->error ());
}
else if (has_dot_last_component (dir))
set_errno (fh->exists () ? EINVAL : ENOENT);
else if (!fh->rmdir ())
res = 0;
delete fh;
done:
syscall_printf ("%d = rmdir (%s)", res, dir);
return res;
}
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