422 lines
8.0 KiB
C
422 lines
8.0 KiB
C
/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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nullio.c
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Abstract:
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This module implements io on the 'null' device. It's pretty
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simple.
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Author:
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Matthew Bradburn (mattbr) 01-Aug-1995
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Revision History:
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--*/
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#include <sys/stat.h>
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#include <time.h>
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#include <wchar.h>
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#include "psxsrv.h"
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BOOLEAN
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NullOpen(
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IN PPSX_PROCESS p,
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IN PFILEDESCRIPTOR Fd,
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IN OUT PPSX_API_MSG m
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);
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BOOLEAN
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NullRead(
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IN PPSX_PROCESS p,
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IN OUT PPSX_API_MSG m,
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IN PFILEDESCRIPTOR Fd
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);
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BOOLEAN
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NullWrite(
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IN PPSX_PROCESS p,
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IN OUT PPSX_API_MSG m,
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IN PFILEDESCRIPTOR Fd
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);
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BOOLEAN
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NullDup(
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IN PPSX_PROCESS p,
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IN OUT PPSX_API_MSG m,
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IN PFILEDESCRIPTOR Fd,
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IN PFILEDESCRIPTOR FdDup
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);
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BOOLEAN
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NullLseek(
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IN PPSX_PROCESS p,
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IN OUT PPSX_API_MSG m,
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IN PFILEDESCRIPTOR Fd
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);
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BOOLEAN
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NullStat(
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IN PIONODE IoNode,
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IN HANDLE FileHandle,
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OUT struct stat *StatBuf,
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OUT NTSTATUS *pStatus
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);
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void
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FindOwnerModeFile(
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IN HANDLE FileHandle,
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OUT struct stat *StatBuf
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);
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PSXIO_VECTORS NullVectors = {
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NullOpen, // OpenNewHandle
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NULL, // NewHandle
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NULL, // Close
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NULL, // LastClose
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NULL, // IoNodeClose
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NullRead, // Read
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NullWrite, // Write
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NullDup, // Dup
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NullLseek, // Lseek
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NullStat // Stat
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};
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BOOLEAN
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NullOpen(
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IN PPSX_PROCESS p,
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IN PFILEDESCRIPTOR Fd,
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IN OUT PPSX_API_MSG m
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)
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/*++
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Routine Description:
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This routine
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Arguments:
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Return Value:
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FALSE - Failure.
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TRUE - Success.
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--*/
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{
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PPSX_OPEN_MSG args;
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LARGE_INTEGER time;
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ULONG posix_time;
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args = &m->u.Open;
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NtQuerySystemTime(&time);
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if (!RtlTimeToSecondsSince1970(&time, &posix_time)) {
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posix_time = 0;
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}
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KdPrint(("Posix time: %x\n", posix_time));
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RtlEnterCriticalSection(&Fd->SystemOpenFileDesc->IoNode->IoNodeLock);
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Fd->SystemOpenFileDesc->IoNode->ModifyDataTime = posix_time;
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Fd->SystemOpenFileDesc->IoNode->ModifyIoNodeTime = posix_time;
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Fd->SystemOpenFileDesc->IoNode->AccessDataTime = posix_time;
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RtlLeaveCriticalSection(&Fd->SystemOpenFileDesc->IoNode->IoNodeLock);
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return TRUE;
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}
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BOOLEAN
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NullWrite(
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IN PPSX_PROCESS p,
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IN OUT PPSX_API_MSG m,
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IN PFILEDESCRIPTOR Fd
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)
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/*++
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Routine Description:
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This procedure implements write when the device being written
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is the null device. Writes to the null device succeed, and the
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data is discarded.
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Arguments:
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p - Supplies the address of the process making the call.
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m - Supplies the address of the message associated with the request.
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Fd - supplies the address of the file descriptor being written.
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Return Value:
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--*/
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{
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PPSX_WRITE_MSG args;
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LARGE_INTEGER time;
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ULONG posix_time;
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NTSTATUS st;
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args = &m->u.Write;
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if (args->Nbytes > 0) {
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//
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// Update the times for stat.
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//
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NtQuerySystemTime(&time);
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if (!RtlTimeToSecondsSince1970(&time, &posix_time)) {
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posix_time = 0;
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}
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RtlEnterCriticalSection(&Fd->SystemOpenFileDesc->IoNode->IoNodeLock);
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Fd->SystemOpenFileDesc->IoNode->ModifyDataTime = posix_time;
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Fd->SystemOpenFileDesc->IoNode->ModifyIoNodeTime = posix_time;
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RtlLeaveCriticalSection(&Fd->SystemOpenFileDesc->IoNode->IoNodeLock);
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}
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m->ReturnValue = args->Nbytes;
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return TRUE;
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}
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BOOLEAN
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NullRead(
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IN PPSX_PROCESS p,
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IN OUT PPSX_API_MSG m,
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IN PFILEDESCRIPTOR Fd
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)
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/*++
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Routine Description:
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This procedure implements read when the device being read
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is the null device. Reads from this device always return EOF.
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Arguments:
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p - Supplies the address of the process making the call.
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m - Supplies the address of the message associated with the request.
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Fd - supplies the address of the file descriptor being read.
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Return Value:
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--*/
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{
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PPSX_READ_MSG args;
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NTSTATUS st;
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LARGE_INTEGER ByteOffset;
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ULONG IoBufferSize;
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LARGE_INTEGER Time;
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ULONG posix_time;
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args = &m->u.Read;
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if (args->Nbytes > 0) {
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//
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// Update the access time on the ionode.
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//
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NtQuerySystemTime(&Time);
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if (!RtlTimeToSecondsSince1970(&Time, &posix_time)) {
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posix_time = 0;
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}
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RtlEnterCriticalSection(&Fd->SystemOpenFileDesc->IoNode->IoNodeLock);
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Fd->SystemOpenFileDesc->IoNode->AccessDataTime = posix_time;
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RtlLeaveCriticalSection(&Fd->SystemOpenFileDesc->IoNode->IoNodeLock);
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}
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m->ReturnValue = 0;
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return TRUE;
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}
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BOOLEAN
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NullDup(
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IN PPSX_PROCESS p,
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IN OUT PPSX_API_MSG m,
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IN PFILEDESCRIPTOR Fd,
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IN PFILEDESCRIPTOR FdDup
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)
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/*++
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Routine Description:
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This procedure implements dup and dup2.
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Arguments:
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p - Supplies the address of the process making the call.
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m - Supplies the address of the message associated with the request.
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Fd - supplies the address of the file descriptor being duplicated.
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FdDup - supplies the address of the duplicate file descriptor.
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Return Value:
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TRUE.
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--*/
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{
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PPSX_DUP_MSG args;
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args = &m->u.Dup;
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//
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// Copy contents of source file descriptor slot into new descriptor
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// Note that FD_CLOEXEC must be CLEAR on FdDup.
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//
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*FdDup = *Fd;
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FdDup->Flags &= ~PSX_FD_CLOSE_ON_EXEC;
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//
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// Increment reference count associated with the SystemOpenFile
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// descriptor for this file.
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//
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// Grab system open file lock
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RtlEnterCriticalSection(&SystemOpenFileLock);
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Fd->SystemOpenFileDesc->HandleCount++;
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RtlLeaveCriticalSection(&SystemOpenFileLock);
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return TRUE;
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}
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BOOLEAN
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NullLseek(
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IN PPSX_PROCESS p,
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IN OUT PPSX_API_MSG m,
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IN PFILEDESCRIPTOR Fd
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)
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/*++
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Routine Description:
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This procedure implements lseek when the device being seeked on
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is the null device. We allow these seeks, but they have no effect.
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Arguments:
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p - Supplies the address of the process making the call.
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m - Supplies the address of the message associated with the request.
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Fd - supplies the address of the file descriptor being seekd
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Return Value:
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TRUE
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--*/
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{
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PPSX_LSEEK_MSG args;
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NTSTATUS st;
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LARGE_INTEGER Offset, NewByteOffset;
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args = &m->u.Lseek;
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Offset = RtlConvertLongToLargeInteger(args->Offset);
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NewByteOffset = Offset;
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if (SEEK_CUR != args->Whence && SEEK_SET != args->Whence &&
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SEEK_END != args->Whence) {
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m->Error = EINVAL;
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return TRUE;
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}
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// Check for overflow. POSIX limited to arithmetic data type for off_t
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if (NewByteOffset.HighPart != 0 || (off_t)NewByteOffset.LowPart < 0) {
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m->Error = EINVAL;
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}
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return TRUE;
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}
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BOOLEAN
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NullStat(
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IN PIONODE IoNode,
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IN HANDLE FileHandle,
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OUT struct stat *StatBuf,
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OUT NTSTATUS *pStatus
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)
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/*++
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Routine Description:
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This procedure implements stat when the device being read
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is the null device.
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Arguments:
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IoNode - supplies a pointer to the ionode of the file for which stat is
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requested. NULL if no active Ionode entry.
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FileHandle - supplies the Nt file handle of the file .
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StatBuf - Supplies the address of the statbuf portion of the message
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associated with the request.
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Return Value:
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TRUE.
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--*/
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{
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IO_STATUS_BLOCK Iosb;
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//
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// First get the static information on the file from the ionode if
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// there is one (i.e. if the file currently open.
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// Open() sets the fields in the ionode.
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//
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if (NULL != IoNode) {
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StatBuf->st_mode = IoNode->Mode;
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StatBuf->st_ino = IoNode->FileSerialNumber;
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StatBuf->st_dev = IoNode->DeviceSerialNumber;
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StatBuf->st_atime = IoNode->AccessDataTime;
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StatBuf->st_ctime = IoNode->ModifyIoNodeTime;
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StatBuf->st_mtime = IoNode->ModifyDataTime;
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}
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StatBuf->st_uid = 0;
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StatBuf->st_gid = 0;
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StatBuf->st_size = 0;
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StatBuf->st_nlink = 1;
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return TRUE;
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}
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