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newlib/winsup/cygwin/fhandler_tape.cc

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/* fhandler_tape.cc. See fhandler.h for a description of the fhandler
classes.
Copyright 1999, 2000, 2001, 2002 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 <sys/termios.h>
#include <unistd.h>
#include <sys/mtio.h>
#include "cygerrno.h"
#include "perprocess.h"
#include "security.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
/**********************************************************************/
/* fhandler_dev_tape */
void
fhandler_dev_tape::clear (void)
{
lasterr = 0;
fhandler_dev_raw::clear ();
}
int
fhandler_dev_tape::is_eom (int win_error)
{
int ret = ((win_error == ERROR_END_OF_MEDIA)
|| (win_error == ERROR_EOM_OVERFLOW)
|| (win_error == ERROR_NO_DATA_DETECTED));
if (ret)
debug_printf ("end of medium");
return ret;
}
int
fhandler_dev_tape::is_eof (int win_error)
{
int ret = ((win_error == ERROR_FILEMARK_DETECTED)
|| (win_error == ERROR_SETMARK_DETECTED));
if (ret)
debug_printf ("end of file");
return ret;
}
fhandler_dev_tape::fhandler_dev_tape ()
: fhandler_dev_raw ()
{
debug_printf ("unit: %d", dev ().minor);
}
int
fhandler_dev_tape::open (int flags, mode_t)
{
int ret;
devbufsiz = 1L;
ret = fhandler_dev_raw::open (flags);
if (ret)
{
struct mtget get;
struct mtop op;
struct mtpos pos;
if (!ioctl (MTIOCGET, &get))
/* Tape drive supports and is set to variable block size. */
if (get.mt_dsreg == 0)
devbufsiz = get.mt_maxblksize;
else
devbufsiz = get.mt_dsreg;
varblkop = get.mt_dsreg == 0;
if (devbufsiz > 1L)
devbuf = new char [devbufsiz];
/* The following rewind in position 0 solves a problem which appears
* in case of multi volume archives: The last ReadFile on first medium
* returns ERROR_NO_DATA_DETECTED. After media change, all subsequent
* ReadFile calls return ERROR_NO_DATA_DETECTED, too.
* The call to tape_set_pos seems to reset some internal flags. */
if ((!ioctl (MTIOCPOS, &pos)) && (!pos.mt_blkno))
{
op.mt_op = MTREW;
ioctl (MTIOCTOP, &op);
}
if (flags & O_APPEND)
{
/* In append mode, seek to beginning of next filemark */
op.mt_op = MTFSFM;
op.mt_count = 1;
ioctl (MTIOCTOP, &op);
}
}
return ret;
}
int
fhandler_dev_tape::close (void)
{
struct mtop op;
int ret = 0;
if (is_writing)
{
ret = writebuf ();
if ((has_written) && (! eom_detected))
{
/* if last operation was writing, write a filemark */
debug_printf ("writing filemark");
op.mt_op = MTWEOF;
op.mt_count = 1;
ioctl (MTIOCTOP, &op);
}
}
// To protected reads on signaling (e.g. Ctrl-C)
eof_detected = 1;
if (is_rewind_device ())
{
debug_printf ("rewinding");
op.mt_op = MTREW;
ioctl (MTIOCTOP, &op);
}
if (ret)
{
fhandler_dev_raw::close ();
return ret;
}
return fhandler_dev_raw::close ();
}
int
fhandler_dev_tape::fstat (struct __stat64 *buf)
{
int ret;
if (!(ret = fhandler_base::fstat (buf)))
{
struct mtget get;
if (!ioctl (MTIOCGET, &get))
buf->st_blocks = get.mt_capacity / buf->st_blksize;
}
return ret;
}
_off64_t
fhandler_dev_tape::lseek (_off64_t offset, int whence)
{
struct mtop op;
struct mtpos pos;
debug_printf ("lseek (%s, %d, %d)", get_name (), offset, whence);
writebuf ();
eom_detected = eof_detected = 0;
lastblk_to_read = 0;
devbufstart = devbufend = 0;
if (ioctl (MTIOCPOS, &pos))
{
return ILLEGAL_SEEK;
}
switch (whence)
{
case SEEK_END:
op.mt_op = MTFSF;
op.mt_count = 1;
if (ioctl (MTIOCTOP, &op))
return -1;
break;
case SEEK_SET:
if (whence == SEEK_SET && offset < 0)
{
set_errno (EINVAL);
return -1;
}
break;
case SEEK_CUR:
break;
default:
set_errno (EINVAL);
return -1;
}
op.mt_op = MTFSR;
op.mt_count = offset / devbufsiz
- (whence == SEEK_SET ? pos.mt_blkno : 0);
if (op.mt_count < 0)
{
op.mt_op = MTBSR;
op.mt_count = -op.mt_count;
}
if (ioctl (MTIOCTOP, &op) || ioctl (MTIOCPOS, &pos))
return -1;
return (pos.mt_blkno * devbufsiz);
}
int
fhandler_dev_tape::dup (fhandler_base *child)
{
fhandler_dev_tape *fhc = (fhandler_dev_tape *) child;
fhc->lasterr = lasterr;
return fhandler_dev_raw::dup (child);
}
int
fhandler_dev_tape::ioctl (unsigned int cmd, void *buf)
{
int ret = NO_ERROR;
unsigned long block;
if (cmd == MTIOCTOP)
{
struct mtop *op = (struct mtop *) buf;
if (! op)
ret = ERROR_INVALID_PARAMETER;
else
switch (op->mt_op)
{
case MTRESET:
break;
case MTFSF:
ret = tape_set_pos (TAPE_SPACE_FILEMARKS, op->mt_count);
break;
case MTBSF:
ret = tape_set_pos (TAPE_SPACE_FILEMARKS, -op->mt_count);
break;
case MTFSR:
ret = tape_set_pos (TAPE_SPACE_RELATIVE_BLOCKS, op->mt_count);
break;
case MTBSR:
ret = tape_set_pos (TAPE_SPACE_RELATIVE_BLOCKS, -op->mt_count);
break;
case MTWEOF:
if (tape_get_feature (TAPE_DRIVE_WRITE_FILEMARKS))
ret = tape_write_marks (TAPE_FILEMARKS, op->mt_count);
else if (tape_get_feature (TAPE_DRIVE_WRITE_LONG_FMKS))
ret = tape_write_marks (TAPE_LONG_FILEMARKS, op->mt_count);
else
ret = tape_write_marks (TAPE_SHORT_FILEMARKS, op->mt_count);
break;
case MTREW:
ret = tape_set_pos (TAPE_REWIND, 0);
break;
case MTOFFL:
ret = tape_prepare (TAPE_UNLOAD);
break;
case MTNOP:
break;
case MTRETEN:
if (! tape_get_feature (TAPE_DRIVE_END_OF_DATA))
ret = ERROR_INVALID_PARAMETER;
else if (! (ret = tape_set_pos (TAPE_REWIND, 0, FALSE)))
ret = tape_prepare (TAPE_TENSION);
break;
case MTBSFM:
ret = tape_set_pos (TAPE_SPACE_FILEMARKS, -op->mt_count, TRUE);
break;
case MTFSFM:
ret = tape_set_pos (TAPE_SPACE_FILEMARKS, op->mt_count, TRUE);
break;
case MTEOM:
if (tape_get_feature (TAPE_DRIVE_END_OF_DATA))
ret = tape_set_pos (TAPE_SPACE_END_OF_DATA, 0);
else
ret = tape_set_pos (TAPE_SPACE_FILEMARKS, 32767);
break;
case MTERASE:
ret = tape_erase (TAPE_ERASE_SHORT);
break;
case MTRAS1:
case MTRAS2:
case MTRAS3:
ret = ERROR_INVALID_PARAMETER;
break;
case MTSETBLK:
{
long min, max;
if (! tape_get_feature (TAPE_DRIVE_SET_BLOCK_SIZE))
{
ret = ERROR_INVALID_PARAMETER;
break;
}
ret = tape_get_blocksize (&min, NULL, &max, NULL);
if (ret)
break;
if (devbuf && (size_t) op->mt_count == devbufsiz && !varblkop)
{
ret = 0;
break;
}
if ((op->mt_count == 0
&& !tape_get_feature (TAPE_DRIVE_VARIABLE_BLOCK))
|| (op->mt_count > 0
&& (op->mt_count < min || op->mt_count > max)))
{
ret = ERROR_INVALID_PARAMETER;
break;
}
if (devbuf && op->mt_count > 0
&& (size_t) op->mt_count < devbufend - devbufstart)
{
ret = ERROR_MORE_DATA;
break;
}
if (! (ret = tape_set_blocksize (op->mt_count)))
{
size_t size = 0;
if (op->mt_count == 0)
{
struct mtget get;
if ((ret = tape_status (&get)) != NO_ERROR)
break;
size = get.mt_maxblksize;
ret = NO_ERROR;
}
char *buf = NULL;
if (size > 1L && !(buf = new char [size]))
{
ret = ERROR_OUTOFMEMORY;
break;
}
if (devbufsiz > 1L && size > 1L)
{
memcpy (buf, devbuf + devbufstart,
devbufend - devbufstart);
devbufend -= devbufstart;
}
else
devbufend = 0;
if (devbufsiz > 1L)
delete [] devbuf;
devbufstart = 0;
devbuf = buf;
devbufsiz = size;
varblkop = op->mt_count == 0;
}
}
break;
case MTSETDENSITY:
ret = ERROR_INVALID_PARAMETER;
break;
case MTSEEK:
if (tape_get_feature (TAPE_DRIVE_ABSOLUTE_BLK))
{
ret = tape_set_pos (TAPE_ABSOLUTE_BLOCK, op->mt_count);
break;
}
if (! (ret = tape_get_pos (&block)))
{
ret = tape_set_pos (TAPE_SPACE_RELATIVE_BLOCKS,
op->mt_count - block);
}
break;
case MTTELL:
if (! (ret = tape_get_pos (&block)))
op->mt_count = block;
break;
case MTSETDRVBUFFER:
ret = ERROR_INVALID_PARAMETER;
break;
case MTFSS:
ret = tape_set_pos (TAPE_SPACE_SETMARKS, op->mt_count);
break;
case MTBSS:
ret = tape_set_pos (TAPE_SPACE_SETMARKS, -op->mt_count);
break;
case MTWSM:
ret = tape_write_marks (TAPE_SETMARKS, op->mt_count);
break;
case MTLOCK:
ret = tape_prepare (TAPE_LOCK);
break;
case MTUNLOCK:
ret = tape_prepare (TAPE_UNLOCK);
break;
case MTLOAD:
ret = tape_prepare (TAPE_LOAD);
break;
case MTUNLOAD:
ret = tape_prepare (TAPE_UNLOAD);
break;
case MTCOMPRESSION:
ret = tape_compression (op->mt_count);
break;
case MTSETPART:
case MTMKPART:
default:
ret = ERROR_INVALID_PARAMETER;
break;
}
}
else if (cmd == MTIOCGET)
ret = tape_status ((struct mtget *) buf);
else if (cmd == MTIOCPOS)
{
ret = ERROR_INVALID_PARAMETER;
if (buf && (ret = tape_get_pos (&block)))
((struct mtpos *) buf)->mt_blkno = block;
}
else
return fhandler_dev_raw::ioctl (cmd, buf);
if (ret != NO_ERROR)
{
SetLastError (ret);
__seterrno ();
return -1;
}
return 0;
}
/* ------------------------------------------------------------------ */
/* Private functions used by `ioctl' */
/* ------------------------------------------------------------------ */
static int
tape_error (DWORD lasterr, const char *txt)
{
if (lasterr)
debug_printf ("%s: error: %d", txt, lasterr);
return lasterr;
}
int
fhandler_dev_tape::tape_write_marks (int marktype, DWORD len)
{
syscall_printf ("write_tapemark");
while (((lasterr = WriteTapemark (get_handle (),
marktype,
len,
FALSE)) == ERROR_MEDIA_CHANGED)
|| (lasterr == ERROR_BUS_RESET))
;
return tape_error (lasterr, "tape_write_marks");
}
int
fhandler_dev_tape::tape_get_pos (unsigned long *ret)
{
DWORD part, low, high;
while (((lasterr = GetTapePosition (get_handle (),
TAPE_ABSOLUTE_POSITION,
&part,
&low,
&high)) == ERROR_MEDIA_CHANGED)
|| (lasterr == ERROR_BUS_RESET))
;
if (! tape_error (lasterr, "tape_get_pos") && ret)
*ret = low;
return lasterr;
}
static int _tape_set_pos (HANDLE hTape, int mode, long count)
{
int err;
while (((err = SetTapePosition (hTape,
mode,
1,
count,
count < 0 ? -1 : 0,
FALSE)) == ERROR_MEDIA_CHANGED)
|| (err == ERROR_BUS_RESET))
;
return err;
}
int
fhandler_dev_tape::tape_set_pos (int mode, long count, BOOLEAN sfm_func)
{
unsigned long pos, tgtpos;
switch (mode)
{
case TAPE_SPACE_RELATIVE_BLOCKS:
lasterr = tape_get_pos (&pos);
if (lasterr)
return lasterr;
tgtpos = pos + count;
while (((lasterr = _tape_set_pos (get_handle (),
mode,
count)) == ERROR_FILEMARK_DETECTED)
|| (lasterr == ERROR_SETMARK_DETECTED))
{
lasterr = tape_get_pos (&pos);
if (lasterr)
return lasterr;
count = tgtpos - pos;
}
if (lasterr == ERROR_BEGINNING_OF_MEDIA && ! tgtpos)
lasterr = NO_ERROR;
break;
case TAPE_SPACE_FILEMARKS:
if (count < 0)
{
if (pos > 0)
{
if ((! _tape_set_pos (get_handle (),
TAPE_SPACE_RELATIVE_BLOCKS,
-1))
|| (sfm_func))
++count;
_tape_set_pos (get_handle (), TAPE_SPACE_RELATIVE_BLOCKS, 1);
}
while (! (lasterr = _tape_set_pos (get_handle (), mode, -1))
&& count++ < 0)
;
if (lasterr == ERROR_BEGINNING_OF_MEDIA)
{
if (! count)
lasterr = NO_ERROR;
}
else if (! sfm_func)
lasterr = _tape_set_pos (get_handle (), mode, 1);
}
else
{
if (sfm_func)
{
if (_tape_set_pos (get_handle (),
TAPE_SPACE_RELATIVE_BLOCKS,
1) == ERROR_FILEMARK_DETECTED)
++count;
_tape_set_pos (get_handle (), TAPE_SPACE_RELATIVE_BLOCKS, -1);
}
if (! (lasterr = _tape_set_pos (get_handle (), mode, count))
&& sfm_func)
lasterr = _tape_set_pos (get_handle (), mode, -1);
}
break;
case TAPE_SPACE_SETMARKS:
case TAPE_ABSOLUTE_BLOCK:
case TAPE_SPACE_END_OF_DATA:
case TAPE_REWIND:
lasterr = _tape_set_pos (get_handle (), mode, count);
break;
}
return tape_error (lasterr, "tape_set_pos");
}
int
fhandler_dev_tape::tape_erase (int mode)
{
DWORD varlen;
TAPE_GET_DRIVE_PARAMETERS dp;
while (((lasterr = GetTapeParameters (get_handle (),
GET_TAPE_DRIVE_INFORMATION,
(varlen = sizeof dp, &varlen),
&dp)) == ERROR_MEDIA_CHANGED)
|| (lasterr == ERROR_BUS_RESET))
;
switch (mode)
{
case TAPE_ERASE_SHORT:
if (! lasterr && ! (dp.FeaturesLow & TAPE_DRIVE_ERASE_SHORT))
mode = TAPE_ERASE_LONG;
break;
case TAPE_ERASE_LONG:
if (! lasterr && ! (dp.FeaturesLow & TAPE_DRIVE_ERASE_LONG))
mode = TAPE_ERASE_SHORT;
break;
}
return tape_error (EraseTape (get_handle (), mode, FALSE), "tape_erase");
}
int
fhandler_dev_tape::tape_prepare (int action)
{
while (((lasterr = PrepareTape (get_handle (),
action,
FALSE)) == ERROR_MEDIA_CHANGED)
|| (lasterr == ERROR_BUS_RESET))
;
return tape_error (lasterr, "tape_prepare");
}
BOOLEAN
fhandler_dev_tape::tape_get_feature (DWORD parm)
{
DWORD varlen;
TAPE_GET_DRIVE_PARAMETERS dp;
while (((lasterr = GetTapeParameters (get_handle (),
GET_TAPE_DRIVE_INFORMATION,
(varlen = sizeof dp, &varlen),
&dp)) == ERROR_MEDIA_CHANGED)
|| (lasterr == ERROR_BUS_RESET))
;
if (lasterr)
return FALSE;
return ((parm & TAPE_DRIVE_HIGH_FEATURES)
? ((dp.FeaturesHigh & parm) != 0)
: ((dp.FeaturesLow & parm) != 0));
}
int
fhandler_dev_tape::tape_get_blocksize (long *min, long *def, long *max, long *cur)
{
DWORD varlen;
TAPE_GET_DRIVE_PARAMETERS dp;
TAPE_GET_MEDIA_PARAMETERS mp;
while (((lasterr = GetTapeParameters (get_handle (),
GET_TAPE_DRIVE_INFORMATION,
(varlen = sizeof dp, &varlen),
&dp)) == ERROR_MEDIA_CHANGED)
|| (lasterr == ERROR_BUS_RESET))
;
if (lasterr)
return tape_error (lasterr, "tape_get_blocksize");
while (((lasterr = GetTapeParameters (get_handle (),
GET_TAPE_MEDIA_INFORMATION,
(varlen = sizeof dp, &varlen),
&mp)) == ERROR_MEDIA_CHANGED)
|| (lasterr == ERROR_BUS_RESET))
;
if (lasterr)
return tape_error (lasterr, "tape_get_blocksize");
if (min)
*min = (long) dp.MinimumBlockSize;
if (def)
*def = (long) dp.DefaultBlockSize;
if (max)
*max = (long) dp.MaximumBlockSize;
if (cur)
*cur = (long) mp.BlockSize;
return tape_error (lasterr, "tape_get_blocksize");
}
int
fhandler_dev_tape::tape_set_blocksize (long count)
{
long min, max;
TAPE_SET_MEDIA_PARAMETERS mp;
lasterr = tape_get_blocksize (&min, NULL, &max, NULL);
if (lasterr)
return lasterr;
if (count != 0 && (count < min || count > max))
return tape_error (ERROR_INVALID_PARAMETER, "tape_set_blocksize");
mp.BlockSize = count;
return tape_error (SetTapeParameters (get_handle (),
SET_TAPE_MEDIA_INFORMATION,
&mp),
"tape_set_blocksize");
}
static long long
get_ll (PLARGE_INTEGER i)
{
long long l = 0;
l = i->HighPart;
l <<= 32;
l |= i->LowPart;
return l;
}
int
fhandler_dev_tape::tape_status (struct mtget *get)
{
DWORD varlen;
TAPE_GET_DRIVE_PARAMETERS dp;
TAPE_GET_MEDIA_PARAMETERS mp;
int notape = 0;
if (! get)
return ERROR_INVALID_PARAMETER;
while (((lasterr = GetTapeParameters (get_handle (),
GET_TAPE_DRIVE_INFORMATION,
(varlen = sizeof dp, &varlen),
&dp)) == ERROR_MEDIA_CHANGED)
|| (lasterr == ERROR_BUS_RESET))
;
/* Setting varlen to sizeof DP is by intention, actually! Never set
it to sizeof MP which seems to be more correct but results in a
ERROR_MORE_DATA error at least on W2K. */
if ((lasterr) || (lasterr = GetTapeParameters (get_handle (),
GET_TAPE_MEDIA_INFORMATION,
(varlen = sizeof dp, &varlen),
&mp)))
notape = 1;
memset (get, 0, sizeof *get);
get->mt_type = MT_ISUNKNOWN;
if (! notape && (dp.FeaturesLow & TAPE_DRIVE_TAPE_REMAINING))
{
get->mt_remaining = get_ll (&mp.Remaining);
get->mt_resid = get->mt_remaining >> 10;
}
if ((dp.FeaturesHigh & TAPE_DRIVE_SET_BLOCK_SIZE) && ! notape)
get->mt_dsreg = mp.BlockSize;
else
get->mt_dsreg = dp.DefaultBlockSize;
if (notape)
get->mt_gstat |= GMT_DR_OPEN (-1);
if (! notape)
{
if (dp.FeaturesLow & TAPE_DRIVE_GET_ABSOLUTE_BLK)
tape_get_pos ((unsigned long *) &get->mt_blkno);
if (! get->mt_blkno)
get->mt_gstat |= GMT_BOT (-1);
get->mt_gstat |= GMT_ONLINE (-1);
if ((dp.FeaturesLow & TAPE_DRIVE_WRITE_PROTECT) && mp.WriteProtected)
get->mt_gstat |= GMT_WR_PROT (-1);
if (dp.FeaturesLow & TAPE_DRIVE_TAPE_CAPACITY)
get->mt_capacity = get_ll (&mp.Capacity);
}
if ((dp.FeaturesLow & TAPE_DRIVE_COMPRESSION) && dp.Compression)
get->mt_gstat |= GMT_HW_COMP (-1);
if ((dp.FeaturesLow & TAPE_DRIVE_ECC) && dp.ECC)
get->mt_gstat |= GMT_HW_ECC (-1);
if ((dp.FeaturesLow & TAPE_DRIVE_PADDING) && dp.DataPadding)
get->mt_gstat |= GMT_PADDING (-1);
if ((dp.FeaturesLow & TAPE_DRIVE_REPORT_SMKS) && dp.ReportSetmarks)
get->mt_gstat |= GMT_IM_REP_EN (-1);
get->mt_erreg = lasterr;
get->mt_minblksize = dp.MinimumBlockSize;
get->mt_maxblksize = dp.MaximumBlockSize;
get->mt_defblksize = dp.DefaultBlockSize;
get->mt_featureslow = dp.FeaturesLow;
get->mt_featureshigh = dp.FeaturesHigh;
get->mt_eotwarningzonesize = dp.EOTWarningZoneSize;
return 0;
}
int
fhandler_dev_tape::tape_compression (long count)
{
DWORD varlen;
TAPE_GET_DRIVE_PARAMETERS dpg;
TAPE_SET_DRIVE_PARAMETERS dps;
while (((lasterr = GetTapeParameters (get_handle (),
GET_TAPE_DRIVE_INFORMATION,
(varlen = sizeof dpg, &varlen),
&dpg)) == ERROR_MEDIA_CHANGED)
|| (lasterr == ERROR_BUS_RESET))
;
if (lasterr)
return tape_error (lasterr, "tape_compression");
if (! (dpg.FeaturesLow & TAPE_DRIVE_COMPRESSION))
return ERROR_INVALID_PARAMETER;
if (count)
{
dps.ECC = dpg.ECC;
dps.Compression = count ? TRUE : FALSE;
dps.DataPadding = dpg.DataPadding;
dps.ReportSetmarks = dpg.ReportSetmarks;
dps.EOTWarningZoneSize = dpg.EOTWarningZoneSize;
lasterr = SetTapeParameters (get_handle (),
SET_TAPE_DRIVE_INFORMATION,
&dps);
if (lasterr)
return tape_error (lasterr, "tape_compression");
dpg.Compression = dps.Compression;
}
return 0;
}
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