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