newlib-cygwin/winsup/cygwin/dir.cc

359 lines
7.5 KiB
C++

/* dir.cc: Posix directory-related routines
Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2006, 2007,
2008, 2009, 2010, 2012 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 <stdlib.h>
#include <unistd.h>
#define _COMPILING_NEWLIB
#include <dirent.h>
#include "cygerrno.h"
#include "security.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "cygtls.h"
#include "tls_pbuf.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, PC_SYM_FOLLOW);
if (!fh)
res = NULL;
else if (fh->exists ())
res = fh->opendir (-1);
else
{
set_errno (ENOENT);
res = NULL;
}
if (!res && fh)
delete fh;
return res;
}
extern "C" DIR *
fdopendir (int fd)
{
DIR *res = NULL;
cygheap_fdget cfd (fd);
if (cfd >= 0)
res = cfd->opendir (fd);
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;
de->d_type = DT_UNKNOWN;
memset (&de->__d_unused1, 0, sizeof (de->__d_unused1));
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 (((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_ino ();
if (!is_dot && !is_dot_dot)
{
PUNICODE_STRING w32name =
((fhandler_base *) dir->__fh)->pc.get_nt_native_path ();
DWORD devn = ((fhandler_base *) dir->__fh)->get_device ();
/* Paths below /proc don't have a Win32 pendant. */
if (isproc_dev (devn))
de->d_ino = hash_path_name (de->d_ino, L"/");
else if (w32name->Buffer[w32name->Length / sizeof (WCHAR) - 1]
!= L'\\')
de->d_ino = hash_path_name (de->d_ino, L"\\");
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;
}
/* telldir */
extern "C" long
telldir (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 was never defined using off_t in POSIX, only in early versions
of glibc. We have to keep the function in as entry point for backward
compatibility. */
extern "C" _off64_t
telldir64 (DIR *dir)
{
return (_off64_t) telldir (dir);
}
/* seekdir */
extern "C" void
seekdir (DIR *dir, long loc)
{
myfault efault;
if (efault.faulted (EFAULT))
return;
if (dir->__d_cookie != __DIRENT_COOKIE)
return;
dir->__flags &= dirent_info_mask;
return ((fhandler_base *) dir->__fh)->seekdir (dir, loc);
}
/* seekdir was never defined using off_t in POSIX, only in early versions
of glibc. We have to keep the function in as entry point for backward
compatibility. */
extern "C" void
seekdir64 (DIR *dir, _off64_t loc)
{
seekdir (dir, (long) 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_info_mask;
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 ("%R = closedir(%p)", -1, 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);
close (dir->__d_fd);
free (dir->__d_dirname);
free (dir->__d_dirent);
free (dir);
syscall_printf ("%R = 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;
tmp_pathbuf tp;
myfault efault;
if (efault.faulted (EFAULT))
return -1;
/* POSIX says mkdir("symlink-to-missing/") should create the
directory "missing", but Linux rejects it with EEXIST. Copy
Linux behavior for now. */
if (!*dir)
{
set_errno (ENOENT);
goto done;
}
if (isdirsep (dir[strlen (dir) - 1]))
{
/* This converts // to /, but since both give EEXIST, we're okay. */
char *buf;
char *p = stpcpy (buf = tp.c_get (), dir) - 1;
dir = buf;
while (p > dir && isdirsep (*p))
*p-- = '\0';
}
if (!(fh = build_fh_name (dir, 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, true))
set_errno (fh->exists () ? EEXIST : ENOENT);
else if (!fh->mkdir (mode))
res = 0;
delete fh;
done:
syscall_printf ("%R = 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, 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 (!fh->exists ())
set_errno (ENOENT);
else if (has_dot_last_component (dir, false))
set_errno (EINVAL);
else if (!fh->rmdir ())
res = 0;
delete fh;
done:
syscall_printf ("%R = rmdir(%s)", res, dir);
return res;
}