549 lines
11 KiB
C++
549 lines
11 KiB
C++
/* fhandler_raw.cc. See fhandler.h for a description of the fhandler classes.
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Copyright 1999, 2000, 2001, 2002, 2003, 2004 Red Hat, Inc.
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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 <sys/termios.h>
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#include <unistd.h>
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#include <cygwin/rdevio.h>
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#include <sys/mtio.h>
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#include <ntdef.h>
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#include "cygerrno.h"
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#include "perprocess.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 "ntdll.h"
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/**********************************************************************/
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/* fhandler_dev_raw */
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int
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fhandler_dev_raw::is_eom (int win_error)
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{
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return 0;
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}
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int
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fhandler_dev_raw::is_eof (int)
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{
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return 0;
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}
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/* Wrapper functions to allow fhandler_dev_tape to detect and care for
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media changes and bus resets. */
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BOOL
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fhandler_dev_raw::write_file (const void *buf, DWORD to_write,
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DWORD *written, int *err)
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{
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BOOL ret;
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*err = 0;
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if (!(ret = WriteFile (get_handle (), buf, to_write, written, 0)))
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*err = GetLastError ();
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syscall_printf ("%d (err %d) = WriteFile (%d, %d, write %d, written %d, 0)",
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ret, *err, get_handle (), buf, to_write, *written);
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return ret;
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}
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BOOL
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fhandler_dev_raw::read_file (void *buf, DWORD to_read, DWORD *read, int *err)
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{
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BOOL ret;
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*err = 0;
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if (!(ret = ReadFile (get_handle (), buf, to_read, read, 0)))
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*err = GetLastError ();
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syscall_printf ("%d (err %d) = ReadFile (%d, %d, to_read %d, read %d, 0)",
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ret, *err, get_handle (), buf, to_read, *read);
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return ret;
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}
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int
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fhandler_dev_raw::writebuf (void)
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{
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DWORD written;
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int ret = 0;
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if (is_writing () && devbuf && devbufend)
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{
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DWORD to_write;
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int ret = 0;
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memset (devbuf + devbufend, 0, devbufsiz - devbufend);
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to_write = ((devbufend - 1) / 512 + 1) * 512;
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if (!write_file (devbuf, to_write, &written, &ret)
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&& is_eom (ret))
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eom_detected (true);
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devbufstart = devbufend = 0;
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}
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is_writing (false);
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return ret;
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}
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fhandler_dev_raw::fhandler_dev_raw ()
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: fhandler_base (), status ()
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{
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need_fork_fixup (true);
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}
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fhandler_dev_raw::~fhandler_dev_raw (void)
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{
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if (devbufsiz > 1L)
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delete [] devbuf;
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}
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int __stdcall
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fhandler_dev_raw::fstat (struct __stat64 *buf)
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{
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debug_printf ("here");
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if (get_major () == DEV_TAPE_MAJOR)
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buf->st_mode = S_IFCHR | STD_RBITS | STD_WBITS | S_IWGRP | S_IWOTH;
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else
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buf->st_mode = S_IFBLK | STD_RBITS | STD_WBITS | S_IWGRP | S_IWOTH;
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buf->st_uid = geteuid32 ();
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buf->st_gid = getegid32 ();
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buf->st_nlink = 1;
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buf->st_blksize = S_BLKSIZE;
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time_as_timestruc_t (&buf->st_ctim);
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buf->st_atim = buf->st_mtim = buf->st_ctim;
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return 0;
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}
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int
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fhandler_dev_raw::open (int flags, mode_t)
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{
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if (!wincap.has_raw_devices ())
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{
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set_errno (ENOENT);
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debug_printf ("%s is accessible under NT/W2K only", get_win32_name ());
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return 0;
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}
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/* Check for illegal flags. */
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if (get_major () != DEV_TAPE_MAJOR && (flags & (O_APPEND | O_EXCL)))
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{
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set_errno (EINVAL);
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return 0;
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}
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/* Always open a raw device existing and binary. */
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flags &= ~(O_CREAT | O_TRUNC);
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flags |= O_BINARY;
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DWORD access = GENERIC_READ | SYNCHRONIZE;
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if (get_major () == DEV_TAPE_MAJOR
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|| (flags & (O_RDONLY | O_WRONLY | O_RDWR)) == O_WRONLY
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|| (flags & (O_RDONLY | O_WRONLY | O_RDWR)) == O_RDWR)
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access |= GENERIC_WRITE;
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extern void str2buf2uni (UNICODE_STRING &, WCHAR *, const char *);
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UNICODE_STRING dev;
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WCHAR devname[CYG_MAX_PATH + 1];
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str2buf2uni (dev, devname, get_win32_name ());
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OBJECT_ATTRIBUTES attr;
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ULONG options = FILE_SYNCHRONOUS_IO_NONALERT;
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/* The O_TEXT flag is used to indicate write-through on tape devices */
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if (get_major () == DEV_TAPE_MAJOR && (flags & O_TEXT))
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options |= FILE_WRITE_THROUGH;
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flags &= ~O_TEXT;
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InitializeObjectAttributes (&attr, &dev, OBJ_CASE_INSENSITIVE, NULL, NULL);
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HANDLE h;
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IO_STATUS_BLOCK io;
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NTSTATUS status = NtOpenFile (&h, access, &attr, &io, 0 /* excl. access */,
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options);
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if (!NT_SUCCESS (status))
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{
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__seterrno_from_win_error (RtlNtStatusToDosError (status));
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return 0;
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}
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set_io_handle (h);
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set_flags ((flags & ~O_TEXT) | O_BINARY);
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if (devbufsiz > 1L)
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devbuf = new char [devbufsiz];
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return 1;
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}
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int
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fhandler_dev_raw::close (void)
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{
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return fhandler_base::close ();
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}
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void
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fhandler_dev_raw::raw_read (void *ptr, size_t& ulen)
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{
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DWORD bytes_read = 0;
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DWORD read2;
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DWORD bytes_to_read;
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int ret;
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size_t len = ulen;
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char *tgt;
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char *p = (char *) ptr;
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/* In mode O_RDWR the buffer has to be written to device first */
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ret = writebuf ();
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if (ret)
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{
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if (is_eom (ret))
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set_errno (ENOSPC);
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else
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__seterrno ();
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goto err;
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}
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/* Checking a previous end of file */
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if (eof_detected () && !lastblk_to_read ())
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{
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eof_detected (false);
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ulen = 0;
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return;
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}
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/* Checking a previous end of media */
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if (eom_detected () && !lastblk_to_read ())
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{
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set_errno (ENOSPC);
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goto err;
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}
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if (devbuf)
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{
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while (len > 0)
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{
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if (devbufstart < devbufend)
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{
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bytes_to_read = min (len, devbufend - devbufstart);
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debug_printf ("read %d bytes from buffer (rest %d)",
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bytes_to_read,
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devbufend - devbufstart - bytes_to_read);
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memcpy (p, devbuf + devbufstart, bytes_to_read);
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len -= bytes_to_read;
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p += bytes_to_read;
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bytes_read += bytes_to_read;
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devbufstart += bytes_to_read;
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if (lastblk_to_read ())
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{
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lastblk_to_read (false);
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break;
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}
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}
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if (len > 0)
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{
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if (len >= devbufsiz)
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{
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bytes_to_read = (len / 512) * 512;
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tgt = p;
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debug_printf ("read %d bytes direct from file",bytes_to_read);
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}
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else
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{
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tgt = devbuf;
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bytes_to_read = devbufsiz;
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debug_printf ("read %d bytes from file into buffer",
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bytes_to_read);
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}
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if (!read_file (tgt, bytes_to_read, &read2, &ret))
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{
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if (!is_eof (ret) && !is_eom (ret))
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{
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__seterrno ();
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goto err;
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}
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if (is_eof (ret))
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eof_detected (true);
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else
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eom_detected (true);
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if (!read2)
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{
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if (!bytes_read && is_eom (ret))
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{
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debug_printf ("return -1, set errno to ENOSPC");
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set_errno (ENOSPC);
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goto err;
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}
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break;
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}
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lastblk_to_read (true);
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}
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if (!read2)
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break;
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if (tgt == devbuf)
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{
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devbufstart = 0;
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devbufend = read2;
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}
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else
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{
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len -= read2;
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p += read2;
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bytes_read += read2;
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}
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}
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}
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}
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else if (!read_file (p, len, &bytes_read, &ret))
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{
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if (!is_eof (ret) && !is_eom (ret))
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{
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__seterrno ();
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goto err;
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}
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if (bytes_read)
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{
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if (is_eof (ret))
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eof_detected (true);
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else
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eom_detected (true);
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}
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else if (is_eom (ret))
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{
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debug_printf ("return -1, set errno to ENOSPC");
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set_errno (ENOSPC);
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goto err;
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}
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}
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ulen = (size_t) bytes_read;
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return;
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err:
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ulen = (size_t) -1;
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return;
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}
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int
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fhandler_dev_raw::raw_write (const void *ptr, size_t len)
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{
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DWORD bytes_written = 0;
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DWORD bytes_to_write;
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DWORD written;
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char *p = (char *) ptr;
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char *tgt;
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int ret;
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/* Checking a previous end of media on tape */
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if (eom_detected ())
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{
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set_errno (ENOSPC);
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return -1;
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}
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if (!is_writing ())
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devbufstart = devbufend = 0;
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is_writing (true);
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if (devbuf)
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{
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while (len > 0)
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{
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if ((len < devbufsiz || devbufend > 0) && devbufend < devbufsiz)
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{
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bytes_to_write = min (len, devbufsiz - devbufend);
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memcpy (devbuf + devbufend, p, bytes_to_write);
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bytes_written += bytes_to_write;
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devbufend += bytes_to_write;
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p += bytes_to_write;
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len -= bytes_to_write;
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}
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else
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{
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if (devbufend == devbufsiz)
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{
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bytes_to_write = devbufsiz;
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tgt = devbuf;
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}
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else
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{
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bytes_to_write = (len / devbufsiz) * devbufsiz;
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tgt = p;
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}
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ret = 0;
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write_file (tgt, bytes_to_write, &written, &ret);
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if (ret)
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{
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if (!is_eom (ret))
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{
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__seterrno ();
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return -1;
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}
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eom_detected (true);
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if (!written && !bytes_written)
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{
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set_errno (ENOSPC);
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return -1;
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}
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if (tgt == p)
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bytes_written += written;
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break; // from while (len > 0)
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}
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if (tgt == devbuf)
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{
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if (written != devbufsiz)
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memmove (devbuf, devbuf + written, devbufsiz - written);
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devbufend = devbufsiz - written;
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}
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else
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{
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len -= written;
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p += written;
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bytes_written += written;
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}
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}
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}
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}
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else if (len > 0)
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{
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if (!write_file (p, len, &bytes_written, &ret))
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{
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if (!is_eom (ret))
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{
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__seterrno ();
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return -1;
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}
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eom_detected (true);
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if (!bytes_written)
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{
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set_errno (ENOSPC);
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return -1;
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}
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}
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}
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return bytes_written;
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}
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int
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fhandler_dev_raw::dup (fhandler_base *child)
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{
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int ret = fhandler_base::dup (child);
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if (! ret)
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{
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fhandler_dev_raw *fhc = (fhandler_dev_raw *) child;
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fhc->devbufsiz = devbufsiz;
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if (devbufsiz > 1L)
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fhc->devbuf = new char [devbufsiz];
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fhc->devbufstart = 0;
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fhc->devbufend = 0;
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fhc->eom_detected (eom_detected ());
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fhc->eof_detected (eof_detected ());
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fhc->lastblk_to_read (false);
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}
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return ret;
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}
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void
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fhandler_dev_raw::fixup_after_fork (HANDLE)
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{
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devbufstart = 0;
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devbufend = 0;
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lastblk_to_read (false);
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}
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void
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fhandler_dev_raw::fixup_after_exec ()
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{
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if (devbufsiz > 1L)
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devbuf = new char [devbufsiz];
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devbufstart = 0;
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devbufend = 0;
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lastblk_to_read (false);
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}
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int
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fhandler_dev_raw::ioctl (unsigned int cmd, void *buf)
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{
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int ret = NO_ERROR;
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if (cmd == RDIOCDOP)
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{
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struct rdop *op = (struct rdop *) buf;
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if (!op)
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ret = ERROR_INVALID_PARAMETER;
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else
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switch (op->rd_op)
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{
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case RDSETBLK:
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if (get_major () == DEV_TAPE_MAJOR)
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{
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struct mtop mop;
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mop.mt_op = MTSETBLK;
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mop.mt_count = op->rd_parm;
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ret = ioctl (MTIOCTOP, &mop);
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}
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else if (op->rd_parm % 512)
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ret = ERROR_INVALID_PARAMETER;
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else if (devbuf && op->rd_parm < devbufend - devbufstart)
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ret = ERROR_INVALID_PARAMETER;
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else if (!devbuf || op->rd_parm != devbufsiz)
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{
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char *buf = new char [op->rd_parm];
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if (devbufsiz > 1L)
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{
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memcpy (buf, devbuf + devbufstart, devbufend - devbufstart);
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devbufend -= devbufstart;
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delete [] devbuf;
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}
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else
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devbufend = 0;
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devbufstart = 0;
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devbuf = buf;
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devbufsiz = op->rd_parm;
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}
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break;
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default:
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break;
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}
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}
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else if (cmd == RDIOCGET)
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{
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struct rdget *get = (struct rdget *) buf;
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if (!get)
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ret = ERROR_INVALID_PARAMETER;
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else
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get->bufsiz = devbufsiz ? devbufsiz : 1L;
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}
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else
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return fhandler_base::ioctl (cmd, buf);
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if (ret != NO_ERROR)
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{
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SetLastError (ret);
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__seterrno ();
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return -1;
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}
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return 0;
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}
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