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/* fhandler_cygdrive.cc
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 <lm.h>
#include <sys/statvfs.h>
#include "cygerrno.h"
#include "security.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "shared_info.h"
#define _LIBC
#include <dirent.h>
fhandler_cygdrive::fhandler_cygdrive () :
fhandler_disk_file ()
{
}
int
fhandler_cygdrive::open (int flags, mode_t mode)
{
if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
{
set_errno (EEXIST);
return 0;
}
if (flags & O_WRONLY)
{
set_errno (EISDIR);
return 0;
}
/* Open a fake handle to \\Device\\Null */
return open_null (flags);
}
int
fhandler_cygdrive::fstat (struct stat *buf)
{
fhandler_base::fstat (buf);
buf->st_ino = 2;
buf->st_mode = S_IFDIR | STD_RBITS | STD_XBITS;
buf->st_nlink = 1;
return 0;
}
int
fhandler_cygdrive::fstatvfs (struct statvfs *sfs)
{
/* Virtual file system. Just return an empty buffer with a few values
set to something useful. Just as on Linux. */
memset (sfs, 0, sizeof (*sfs));
sfs->f_bsize = sfs->f_frsize = 4096;
sfs->f_flag = ST_RDONLY;
sfs->f_namemax = NAME_MAX;
return 0;
}
#define MAX_DRIVE_BUF_LEN (sizeof ("x:\\") * 26 + 2)
struct __DIR_drives
{
char *pdrive;
char pbuf[MAX_DRIVE_BUF_LEN];
};
#define d_drives(d) ((__DIR_drives *) (d)->__d_internal)
DIR *
fhandler_cygdrive::opendir (int fd)
{
DIR *dir;
dir = fhandler_disk_file::opendir (fd);
if (dir)
{
dir->__d_internal = (uintptr_t) new __DIR_drives;
GetLogicalDriveStrings (MAX_DRIVE_BUF_LEN, d_drives(dir)->pbuf);
d_drives(dir)->pdrive = d_drives(dir)->pbuf;
}
return dir;
}
int
fhandler_cygdrive::readdir (DIR *dir, dirent *de)
{
WCHAR drive[] = L"X:";
while (true)
{
if (!d_drives(dir)->pdrive || !*d_drives(dir)->pdrive)
{
if (!(dir->__flags & dirent_saw_dot))
{
de->d_name[0] = '.';
de->d_name[1] = '\0';
de->d_ino = 2;
}
return ENMFILE;
}
disk_type dt = get_disk_type ((drive[0] = *d_drives(dir)->pdrive, drive));
if (dt == DT_SHARE_SMB)
{
/* Calling NetUseGetInfo on SMB drives allows to fetch the
current state of the drive without trying to open a file
descriptor on the share (GetFileAttributes). This avoids
waiting for SMB timeouts. Of course, there's a downside:
If a drive becomes availabe again, it can take a couple of
minutes to recognize it. As long as this didn't happen,
the drive will not show up in the cygdrive dir. */
PUSE_INFO_1 pui1;
DWORD status;
if (NetUseGetInfo (NULL, drive, 1, (PBYTE *) &pui1) == NERR_Success)
{
status = pui1->ui1_status;
NetApiBufferFree (pui1);
if (status == USE_OK)
break;
}
}
else if (dt != DT_FLOPPY
&& GetFileAttributes (d_drives(dir)->pdrive) != INVALID_FILE_ATTRIBUTES)
break;
d_drives(dir)->pdrive = strchr (d_drives(dir)->pdrive, '\0') + 1;
}
*de->d_name = cyg_tolower (*d_drives(dir)->pdrive);
de->d_name[1] = '\0';
user_shared->warned_msdos = true;
de->d_ino = readdir_get_ino (d_drives(dir)->pdrive, false);
dir->__d_position++;
d_drives(dir)->pdrive = strchr (d_drives(dir)->pdrive, '\0') + 1;
syscall_printf ("%p = readdir (%p) (%s)", &de, dir, de->d_name);
return 0;
}
void
fhandler_cygdrive::rewinddir (DIR *dir)
{
d_drives(dir)->pdrive = d_drives(dir)->pbuf;
dir->__d_position = 0;
}
int
fhandler_cygdrive::closedir (DIR *dir)
{
delete d_drives(dir);
return 0;
}
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