417 lines
8.2 KiB
C++
417 lines
8.2 KiB
C++
/* fhandler_raw.cc. See fhandler.h for a description of the fhandler classes.
|
|
|
|
Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005 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 <cygwin/rdevio.h>
|
|
#include <sys/mtio.h>
|
|
#include <ntdef.h>
|
|
#include "cygerrno.h"
|
|
#include "perprocess.h"
|
|
#include "security.h"
|
|
#include "path.h"
|
|
#include "fhandler.h"
|
|
#include "dtable.h"
|
|
#include "cygheap.h"
|
|
#include "ntdll.h"
|
|
|
|
/**********************************************************************/
|
|
/* fhandler_dev_raw */
|
|
|
|
int
|
|
fhandler_dev_raw::is_eom (int win_error)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
fhandler_dev_raw::is_eof (int)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Wrapper functions to simplify error handling. */
|
|
|
|
BOOL
|
|
fhandler_dev_raw::write_file (const void *buf, DWORD to_write,
|
|
DWORD *written, int *err)
|
|
{
|
|
BOOL ret;
|
|
|
|
*err = 0;
|
|
if (!(ret = WriteFile (get_handle (), buf, to_write, written, 0)))
|
|
*err = GetLastError ();
|
|
syscall_printf ("%d (err %d) = WriteFile (%d, %d, write %d, written %d, 0)",
|
|
ret, *err, get_handle (), buf, to_write, *written);
|
|
return ret;
|
|
}
|
|
|
|
BOOL
|
|
fhandler_dev_raw::read_file (void *buf, DWORD to_read, DWORD *read, int *err)
|
|
{
|
|
BOOL ret;
|
|
|
|
*err = 0;
|
|
if (!(ret = ReadFile (get_handle (), buf, to_read, read, 0)))
|
|
*err = GetLastError ();
|
|
syscall_printf ("%d (err %d) = ReadFile (%d, %d, to_read %d, read %d, 0)",
|
|
ret, *err, get_handle (), buf, to_read, *read);
|
|
return ret;
|
|
}
|
|
|
|
fhandler_dev_raw::fhandler_dev_raw ()
|
|
: fhandler_base (), status ()
|
|
{
|
|
need_fork_fixup (true);
|
|
}
|
|
|
|
fhandler_dev_raw::~fhandler_dev_raw ()
|
|
{
|
|
if (devbufsiz > 1L)
|
|
delete [] devbuf;
|
|
}
|
|
|
|
int __stdcall
|
|
fhandler_dev_raw::fstat (struct __stat64 *buf)
|
|
{
|
|
debug_printf ("here");
|
|
|
|
fhandler_base::fstat (buf);
|
|
if (is_auto_device ())
|
|
{
|
|
if (get_major () == DEV_TAPE_MAJOR)
|
|
buf->st_mode = S_IFCHR | STD_RBITS | STD_WBITS | S_IWGRP | S_IWOTH;
|
|
else
|
|
buf->st_mode = S_IFBLK | STD_RBITS | STD_WBITS | S_IWGRP | S_IWOTH;
|
|
|
|
buf->st_uid = geteuid32 ();
|
|
buf->st_gid = getegid32 ();
|
|
buf->st_nlink = 1;
|
|
buf->st_blksize = S_BLKSIZE;
|
|
time_as_timestruc_t (&buf->st_ctim);
|
|
buf->st_atim = buf->st_mtim = buf->st_ctim;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
fhandler_dev_raw::open (int flags, mode_t)
|
|
{
|
|
if (!wincap.has_raw_devices ())
|
|
{
|
|
set_errno (ENOENT);
|
|
debug_printf ("%s is accessible under NT/W2K only", get_win32_name ());
|
|
return 0;
|
|
}
|
|
|
|
/* Check for illegal flags. */
|
|
if (get_major () != DEV_TAPE_MAJOR && (flags & (O_APPEND | O_EXCL)))
|
|
{
|
|
set_errno (EINVAL);
|
|
return 0;
|
|
}
|
|
|
|
/* Always open a raw device existing and binary. */
|
|
flags &= ~(O_CREAT | O_TRUNC);
|
|
flags |= O_BINARY;
|
|
|
|
/* Write-only doesn't work well with raw devices */
|
|
if ((flags & (O_RDONLY | O_WRONLY | O_RDWR)) == O_WRONLY)
|
|
flags = ((flags & ~O_WRONLY) | O_RDWR);
|
|
|
|
int res = fhandler_base::open (flags, 0);
|
|
if (res && devbufsiz > 1L)
|
|
devbuf = new char [devbufsiz];
|
|
|
|
return res;
|
|
}
|
|
|
|
void
|
|
fhandler_dev_raw::raw_read (void *ptr, size_t& ulen)
|
|
{
|
|
DWORD bytes_read = 0;
|
|
DWORD read2;
|
|
DWORD bytes_to_read;
|
|
int ret;
|
|
size_t len = ulen;
|
|
char *tgt;
|
|
char *p = (char *) ptr;
|
|
|
|
/* Checking a previous end of file */
|
|
if (eof_detected () && !lastblk_to_read ())
|
|
{
|
|
eof_detected (false);
|
|
ulen = 0;
|
|
return;
|
|
}
|
|
|
|
/* Checking a previous end of media */
|
|
if (eom_detected () && !lastblk_to_read ())
|
|
{
|
|
set_errno (ENOSPC);
|
|
goto err;
|
|
}
|
|
|
|
if (devbuf)
|
|
{
|
|
while (len > 0)
|
|
{
|
|
if (devbufstart < devbufend)
|
|
{
|
|
bytes_to_read = min (len, devbufend - devbufstart);
|
|
debug_printf ("read %d bytes from buffer (rest %d)",
|
|
bytes_to_read,
|
|
devbufend - devbufstart - bytes_to_read);
|
|
memcpy (p, devbuf + devbufstart, bytes_to_read);
|
|
len -= bytes_to_read;
|
|
p += bytes_to_read;
|
|
bytes_read += bytes_to_read;
|
|
devbufstart += bytes_to_read;
|
|
|
|
if (lastblk_to_read ())
|
|
{
|
|
lastblk_to_read (false);
|
|
break;
|
|
}
|
|
}
|
|
if (len > 0)
|
|
{
|
|
if (len >= devbufsiz)
|
|
{
|
|
bytes_to_read = (len / 512) * 512;
|
|
tgt = p;
|
|
debug_printf ("read %d bytes direct from file",bytes_to_read);
|
|
}
|
|
else
|
|
{
|
|
tgt = devbuf;
|
|
bytes_to_read = devbufsiz;
|
|
debug_printf ("read %d bytes from file into buffer",
|
|
bytes_to_read);
|
|
}
|
|
if (!read_file (tgt, bytes_to_read, &read2, &ret))
|
|
{
|
|
if (!is_eof (ret) && !is_eom (ret))
|
|
{
|
|
__seterrno ();
|
|
goto err;
|
|
}
|
|
|
|
if (is_eof (ret))
|
|
eof_detected (true);
|
|
else
|
|
eom_detected (true);
|
|
|
|
if (!read2)
|
|
{
|
|
if (!bytes_read && is_eom (ret))
|
|
{
|
|
debug_printf ("return -1, set errno to ENOSPC");
|
|
set_errno (ENOSPC);
|
|
goto err;
|
|
}
|
|
break;
|
|
}
|
|
lastblk_to_read (true);
|
|
}
|
|
if (!read2)
|
|
break;
|
|
if (tgt == devbuf)
|
|
{
|
|
devbufstart = 0;
|
|
devbufend = read2;
|
|
}
|
|
else
|
|
{
|
|
len -= read2;
|
|
p += read2;
|
|
bytes_read += read2;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else if (!read_file (p, len, &bytes_read, &ret))
|
|
{
|
|
if (!is_eof (ret) && !is_eom (ret))
|
|
{
|
|
__seterrno ();
|
|
goto err;
|
|
}
|
|
if (bytes_read)
|
|
{
|
|
if (is_eof (ret))
|
|
eof_detected (true);
|
|
else
|
|
eom_detected (true);
|
|
}
|
|
else if (is_eom (ret))
|
|
{
|
|
debug_printf ("return -1, set errno to ENOSPC");
|
|
set_errno (ENOSPC);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
ulen = (size_t) bytes_read;
|
|
return;
|
|
|
|
err:
|
|
ulen = (size_t) -1;
|
|
return;
|
|
}
|
|
|
|
int
|
|
fhandler_dev_raw::raw_write (const void *ptr, size_t len)
|
|
{
|
|
DWORD bytes_written = 0;
|
|
char *p = (char *) ptr;
|
|
int ret;
|
|
|
|
/* Checking a previous end of media on tape */
|
|
if (eom_detected ())
|
|
{
|
|
set_errno (ENOSPC);
|
|
return -1;
|
|
}
|
|
|
|
/* Invalidate buffer. */
|
|
devbufstart = devbufend = 0;
|
|
|
|
if (len > 0)
|
|
{
|
|
if (!write_file (p, len, &bytes_written, &ret))
|
|
{
|
|
if (!is_eom (ret))
|
|
{
|
|
__seterrno ();
|
|
return -1;
|
|
}
|
|
eom_detected (true);
|
|
if (!bytes_written)
|
|
{
|
|
set_errno (ENOSPC);
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
return bytes_written;
|
|
}
|
|
|
|
int
|
|
fhandler_dev_raw::dup (fhandler_base *child)
|
|
{
|
|
int ret = fhandler_base::dup (child);
|
|
|
|
if (! ret)
|
|
{
|
|
fhandler_dev_raw *fhc = (fhandler_dev_raw *) child;
|
|
|
|
fhc->devbufsiz = devbufsiz;
|
|
if (devbufsiz > 1L)
|
|
fhc->devbuf = new char [devbufsiz];
|
|
fhc->devbufstart = 0;
|
|
fhc->devbufend = 0;
|
|
fhc->eom_detected (eom_detected ());
|
|
fhc->eof_detected (eof_detected ());
|
|
fhc->lastblk_to_read (false);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
void
|
|
fhandler_dev_raw::fixup_after_fork (HANDLE)
|
|
{
|
|
devbufstart = 0;
|
|
devbufend = 0;
|
|
lastblk_to_read (false);
|
|
}
|
|
|
|
void
|
|
fhandler_dev_raw::fixup_after_exec ()
|
|
{
|
|
if (devbufsiz > 1L)
|
|
devbuf = new char [devbufsiz];
|
|
devbufstart = 0;
|
|
devbufend = 0;
|
|
lastblk_to_read (false);
|
|
}
|
|
|
|
int
|
|
fhandler_dev_raw::ioctl (unsigned int cmd, void *buf)
|
|
{
|
|
int ret = NO_ERROR;
|
|
|
|
if (cmd == RDIOCDOP)
|
|
{
|
|
struct rdop *op = (struct rdop *) buf;
|
|
|
|
if (!op)
|
|
ret = ERROR_INVALID_PARAMETER;
|
|
else
|
|
switch (op->rd_op)
|
|
{
|
|
case RDSETBLK:
|
|
if (get_major () == DEV_TAPE_MAJOR)
|
|
{
|
|
struct mtop mop;
|
|
|
|
mop.mt_op = MTSETBLK;
|
|
mop.mt_count = op->rd_parm;
|
|
ret = ioctl (MTIOCTOP, &mop);
|
|
}
|
|
else if (op->rd_parm % 512)
|
|
ret = ERROR_INVALID_PARAMETER;
|
|
else if (devbuf && op->rd_parm < devbufend - devbufstart)
|
|
ret = ERROR_INVALID_PARAMETER;
|
|
else if (!devbuf || op->rd_parm != devbufsiz)
|
|
{
|
|
char *buf = new char [op->rd_parm];
|
|
if (devbufsiz > 1L)
|
|
{
|
|
memcpy (buf, devbuf + devbufstart, devbufend - devbufstart);
|
|
devbufend -= devbufstart;
|
|
delete [] devbuf;
|
|
}
|
|
else
|
|
devbufend = 0;
|
|
|
|
devbufstart = 0;
|
|
devbuf = buf;
|
|
devbufsiz = op->rd_parm;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
else if (cmd == RDIOCGET)
|
|
{
|
|
struct rdget *get = (struct rdget *) buf;
|
|
|
|
if (!get)
|
|
ret = ERROR_INVALID_PARAMETER;
|
|
else
|
|
get->bufsiz = devbufsiz ? devbufsiz : 1L;
|
|
}
|
|
else
|
|
return fhandler_base::ioctl (cmd, buf);
|
|
|
|
if (ret != NO_ERROR)
|
|
{
|
|
SetLastError (ret);
|
|
__seterrno ();
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|