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/* fhandler_raw.cc. See fhandler.h for a description of the fhandler classes.
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 <unistd.h>
#include <cygwin/rdevio.h>
#include <sys/mtio.h>
#include <sys/param.h>
#include "cygerrno.h"
#include "path.h"
#include "fhandler.h"
/**********************************************************************/
/* fhandler_dev_raw */
fhandler_dev_raw::fhandler_dev_raw ()
: fhandler_base (),
status ()
{
need_fork_fixup (true);
}
fhandler_dev_raw::~fhandler_dev_raw ()
{
if (devbufsiz > 1L)
delete [] devbufalloc;
}
int __reg2
fhandler_dev_raw::fstat (struct stat *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 = PREFERRED_IO_BLKSIZE;
time_as_timestruc_t (&buf->st_ctim);
buf->st_atim = buf->st_mtim = buf->st_birthtim = buf->st_ctim;
}
return 0;
}
int
fhandler_dev_raw::open (int flags, mode_t)
{
/* Check for illegal flags. */
if (get_major () != DEV_TAPE_MAJOR && (flags & O_APPEND))
{
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_ACCMODE) == O_WRONLY)
flags = ((flags & ~O_WRONLY) | O_RDWR);
int res = fhandler_base::open (flags, 0);
return res;
}
int
fhandler_dev_raw::dup (fhandler_base *child, int flags)
{
int ret = fhandler_base::dup (child, flags);
if (!ret)
{
fhandler_dev_raw *fhc = (fhandler_dev_raw *) child;
if (devbufsiz > 1L)
{
/* Create sector-aligned buffer */
fhc->devbufalloc = new char [devbufsiz + devbufalign];
fhc->devbuf = (char *) roundup2 ((uintptr_t) fhc->devbufalloc,
(uintptr_t) devbufalign);
}
fhc->devbufstart = 0;
fhc->devbufend = 0;
fhc->lastblk_to_read (false);
}
return ret;
}
void
fhandler_dev_raw::fixup_after_fork (HANDLE parent)
{
fhandler_base::fixup_after_fork (parent);
devbufstart = 0;
devbufend = 0;
lastblk_to_read (false);
}
void
fhandler_dev_raw::fixup_after_exec ()
{
if (!close_on_exec ())
{
if (devbufsiz > 1L)
{
/* Create sector-aligned buffer */
devbufalloc = new char [devbufsiz + devbufalign];
devbuf = (char *) roundup2 ((uintptr_t) devbufalloc,
(uintptr_t) devbufalign);
}
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 <= 1 && get_major () != DEV_TAPE_MAJOR)
|| (op->rd_parm > 1 && (op->rd_parm % devbufalign))
|| (get_flags () & O_DIRECT))
/* The conditions for a valid parameter are:
- The new size is either 0 or 1, both indicating unbuffered
I/O, and the device is a tape device.
- Or, the new buffersize must be a multiple of the
required buffer alignment.
- In the O_DIRECT case, the whole request is invalid. */
ret = ERROR_INVALID_PARAMETER;
else if (!devbuf || op->rd_parm != devbufsiz)
{
char *buf = NULL;
off_t curpos = lseek (0, SEEK_CUR);
if (op->rd_parm > 1L)
buf = new char [op->rd_parm + devbufalign];
if (devbufsiz > 1L)
delete [] devbufalloc;
devbufalloc = buf;
devbuf = (char *) roundup2 ((uintptr_t) buf,
(uintptr_t) devbufalign);
devbufsiz = op->rd_parm ?: 1L;
devbufstart = devbufend = 0;
lseek (curpos, SEEK_SET);
}
break;
default:
break;
}
}
else if (cmd == RDIOCGET)
{
struct rdget *get = (struct rdget *) buf;
if (!get)
ret = ERROR_INVALID_PARAMETER;
else
get->bufsiz = devbufsiz;
}
else
return fhandler_base::ioctl (cmd, buf);
if (ret != NO_ERROR)
{
SetLastError (ret);
__seterrno ();
return -1;
}
return 0;
}
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