* Makefile.in: Add fhandler_mem.o to the dependencies.
* dtable.cc (dtable::build_fhandler): Add case for FH_MEM.
* fhandler.h: Add FH_MEM device type. Add class fhandler_dev_mem.
* fhandler_mem.cc: New file. Implementation of class fhandler_dev_mem.
* path.cc: Add /dev/mem to windows_device_names.
(get_device_number): Add FH_MEM type.
This commit is contained in:
Corinna Vinschen
260
winsup/cygwin/fhandler_mem.cc
Normal file
260
winsup/cygwin/fhandler_mem.cc
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@@ -0,0 +1,260 @@
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/* fhandler_mem.cc. See fhandler.h for a description of the fhandler classes.
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Copyright 1999, 2000 Cygnus Solutions.
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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 <fcntl.h>
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#include <errno.h>
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#include <unistd.h>
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#include <ntdef.h>
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#include "cygheap.h"
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#include "cygerrno.h"
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#include "fhandler.h"
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#include "path.h"
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static int inited = FALSE;
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NTSTATUS (__stdcall *NtMapViewOfSection)(HANDLE,HANDLE,PVOID*,ULONG,ULONG,
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PLARGE_INTEGER,PULONG,SECTION_INHERIT,
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ULONG,ULONG);
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NTSTATUS (__stdcall *NtOpenSection)(PHANDLE,ACCESS_MASK,POBJECT_ATTRIBUTES);
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NTSTATUS (__stdcall *NtUnmapViewOfSection)(HANDLE,PVOID);
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VOID (__stdcall *RtlInitUnicodeString)(PUNICODE_STRING,PCWSTR);
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ULONG (__stdcall *RtlNtStatusToDosError) (NTSTATUS);
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int
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load_ntdll_funcs ()
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{
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int ret = 0;
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if (os_being_run != winNT)
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{
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set_errno (ENOENT);
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debug_printf ("/dev/mem is accessible under NT/W2K only");
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return 0;
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}
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HMODULE ntdll = GetModuleHandle ("ntdll.dll");
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if (inited)
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{
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debug_printf ("function pointers already inited");
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return 1;
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}
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if (!ntdll)
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{
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__seterrno ();
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goto out;
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}
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if (!(NtMapViewOfSection = (NTSTATUS (*)(HANDLE,HANDLE,PVOID*,ULONG,ULONG,
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PLARGE_INTEGER,PULONG,
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SECTION_INHERIT,ULONG,ULONG))
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GetProcAddress (ntdll, "NtMapViewOfSection")))
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{
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__seterrno ();
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goto out;
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}
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if (!(NtOpenSection = (NTSTATUS (*)(PHANDLE,ACCESS_MASK,POBJECT_ATTRIBUTES))
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GetProcAddress (ntdll, "NtOpenSection")))
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{
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__seterrno ();
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goto out;
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}
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if (!(NtUnmapViewOfSection = (NTSTATUS (*)(HANDLE,PVOID))
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GetProcAddress (ntdll, "NtUnmapViewOfSection")))
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{
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__seterrno ();
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goto out;
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}
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if (!(RtlInitUnicodeString = (VOID (*)(PUNICODE_STRING,PCWSTR))
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GetProcAddress (ntdll, "RtlInitUnicodeString")))
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{
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__seterrno ();
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goto out;
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}
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if (!(RtlNtStatusToDosError = (ULONG (*)(NTSTATUS))
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GetProcAddress (ntdll, "RtlNtStatusToDosError")))
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{
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__seterrno ();
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goto out;
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}
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inited = TRUE;
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ret = 1;
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out:
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debug_printf ("%d = load_ntdll_funcs()", ret);
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return ret;
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}
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/**********************************************************************/
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/* fhandler_dev_mem */
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fhandler_dev_mem::fhandler_dev_mem (const char *name, int)
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: fhandler_base (FH_MEM, name),
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pos(0UL)
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{
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}
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fhandler_dev_mem::~fhandler_dev_mem (void)
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{
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}
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int
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fhandler_dev_mem::open (const char *, int flags, mode_t)
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{
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if (!load_ntdll_funcs ())
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return 0;
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UNICODE_STRING memstr;
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RtlInitUnicodeString (&memstr, L"\\device\\physicalmemory");
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OBJECT_ATTRIBUTES attr;
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InitializeObjectAttributes(&attr, &memstr, OBJ_CASE_INSENSITIVE, NULL, NULL);
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if ((flags & (O_RDONLY | O_WRONLY | O_RDWR)) == O_RDONLY)
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set_access (SECTION_MAP_READ);
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else if ((flags & (O_RDONLY | O_WRONLY | O_RDWR)) == O_WRONLY)
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set_access (SECTION_MAP_WRITE);
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else
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set_access (SECTION_MAP_READ | SECTION_MAP_WRITE);
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HANDLE mem;
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NTSTATUS ret = NtOpenSection (&mem, get_access (), &attr);
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if (!NT_SUCCESS(ret))
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{
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__seterrno_from_win_error (RtlNtStatusToDosError (ret));
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set_io_handle (NULL);
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return 0;
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}
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set_io_handle (mem);
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return 1;
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}
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int
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fhandler_dev_mem::write (const void *ptr, size_t len)
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{
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set_errno (ENOSYS);
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return -1;
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}
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int
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fhandler_dev_mem::read (void *ptr, size_t ulen)
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{
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if (!ulen)
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return 0;
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PHYSICAL_ADDRESS phys;
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NTSTATUS ret;
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void *viewmem = NULL;
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DWORD len = ulen + 4095;
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phys.QuadPart = (ULONGLONG) pos;
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if ((ret = NtMapViewOfSection (get_handle (),
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INVALID_HANDLE_VALUE,
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&viewmem,
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0L,
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len,
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&phys,
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&len,
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ViewShare,
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0,
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PAGE_READONLY)) != STATUS_SUCCESS)
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{
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__seterrno_from_win_error (RtlNtStatusToDosError (ret));
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return -1;
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}
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memcpy (ptr, (char *) viewmem + (pos - phys.QuadPart), ulen);
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if (!NT_SUCCESS(ret = NtUnmapViewOfSection (INVALID_HANDLE_VALUE, viewmem)))
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{
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__seterrno_from_win_error (RtlNtStatusToDosError (ret));
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return -1;
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}
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pos += ulen;
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return ulen;
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}
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int
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fhandler_dev_mem::close (void)
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{
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return fhandler_base::close ();
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}
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off_t
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fhandler_dev_mem::lseek (off_t offset, int whence)
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{
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switch (whence)
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{
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case SEEK_SET:
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pos = offset;
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break;
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case SEEK_CUR:
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pos += offset;
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break;
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case SEEK_END:
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pos = 0;
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pos -= offset;
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break;
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default:
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set_errno (EINVAL);
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return (off_t) -1;
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}
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return pos;
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}
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int
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fhandler_dev_mem::fstat (struct stat *buf)
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{
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if (!buf)
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{
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set_errno (EINVAL);
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return -1;
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}
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memset (buf, 0, sizeof *buf);
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buf->st_mode = S_IFCHR;
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if (os_being_run != winNT)
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buf->st_mode |= S_IRUSR | S_IWUSR |
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S_IRGRP | S_IWGRP |
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S_IROTH | S_IWOTH;
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buf->st_nlink = 1;
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buf->st_blksize = 4096;
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buf->st_dev = buf->st_rdev = get_device () << 8;
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return 0;
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}
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int
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fhandler_dev_mem::dup (fhandler_base *child)
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{
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set_errno (ENOSYS);
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return -1;
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}
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void
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fhandler_dev_mem::dump ()
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{
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paranoid_printf("here, fhandler_dev_mem");
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}
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