167 lines
5 KiB
C
167 lines
5 KiB
C
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/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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pipe.c
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Abstract:
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This module contains the Win32 Anonymous Pipe API
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Author:
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Steve Wood (stevewo) 24-Sep-1990
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Revision History:
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--*/
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#include "basedll.h"
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ULONG PipeSerialNumber;
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BOOL
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APIENTRY
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CreatePipe(
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OUT LPHANDLE lpReadPipe,
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OUT LPHANDLE lpWritePipe,
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IN LPSECURITY_ATTRIBUTES lpPipeAttributes,
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IN DWORD nSize
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)
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/*++
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Routine Description:
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The CreatePipe API is used to create an anonymous pipe I/O device.
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Two handles to the device are created. One handle is opened for
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reading and the other is opened for writing. These handles may be
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used in subsequent calls to ReadFile and WriteFile to transmit data
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through the pipe.
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Arguments:
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lpReadPipe - Returns a handle to the read side of the pipe. Data
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may be read from the pipe by specifying this handle value in a
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subsequent call to ReadFile.
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lpWritePipe - Returns a handle to the write side of the pipe. Data
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may be written to the pipe by specifying this handle value in a
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subsequent call to WriteFile.
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lpPipeAttributes - An optional parameter that may be used to specify
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the attributes of the new pipe. If the parameter is not
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specified, then the pipe is created without a security
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descriptor, and the resulting handles are not inherited on
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process creation. Otherwise, the optional security attributes
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are used on the pipe, and the inherit handles flag effects both
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pipe handles.
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nSize - Supplies the requested buffer size for the pipe. This is
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only a suggestion and is used by the operating system to
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calculate an appropriate buffering mechanism. A value of zero
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indicates that the system is to choose the default buffering
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scheme.
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Return Value:
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TRUE - The operation was successful.
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FALSE/NULL - The operation failed. Extended error status is available
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using GetLastError.
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--*/
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{
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UCHAR PipeNameBuffer[ MAX_PATH ];
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ANSI_STRING PipeName;
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OBJECT_ATTRIBUTES ObjectAttributes;
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HANDLE ReadPipeHandle, WritePipeHandle;
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NTSTATUS Status;
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IO_STATUS_BLOCK Iosb;
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LARGE_INTEGER Timeout;
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ULONG Attributes;
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PVOID SecurityDescriptor;
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PUNICODE_STRING Unicode;
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//
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// Set the default timeout to 120 seconds
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//
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Timeout.QuadPart = - 10 * 1000 * 1000 * 120;
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if (nSize == 0) {
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nSize = 4096;
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}
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sprintf( PipeNameBuffer,
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WIN32_SS_PIPE_FORMAT_STRING,
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HandleToUlong(NtCurrentTeb()->ClientId.UniqueProcess),
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InterlockedIncrement(&PipeSerialNumber)
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);
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RtlInitAnsiString( &PipeName, PipeNameBuffer );
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Unicode = &NtCurrentTeb()->StaticUnicodeString;
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Status = RtlAnsiStringToUnicodeString(Unicode,&PipeName,FALSE);
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if ( !NT_SUCCESS(Status) ) {
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BaseSetLastNTError(Status);
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return FALSE;
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}
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if ( ARGUMENT_PRESENT(lpPipeAttributes) ) {
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Attributes =
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lpPipeAttributes->bInheritHandle ? (OBJ_INHERIT | OBJ_CASE_INSENSITIVE) : (OBJ_CASE_INSENSITIVE);
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SecurityDescriptor = lpPipeAttributes->lpSecurityDescriptor;
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}
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else {
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Attributes = OBJ_CASE_INSENSITIVE;
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SecurityDescriptor = NULL;
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}
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InitializeObjectAttributes( &ObjectAttributes,
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Unicode,
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Attributes,
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NULL,
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SecurityDescriptor
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);
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Status = NtCreateNamedPipeFile( &ReadPipeHandle,
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GENERIC_READ | FILE_WRITE_ATTRIBUTES | SYNCHRONIZE,
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&ObjectAttributes,
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&Iosb,
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FILE_SHARE_READ | FILE_SHARE_WRITE, // Gary ?
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FILE_CREATE,
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FILE_SYNCHRONOUS_IO_NONALERT,
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FILE_PIPE_BYTE_STREAM_TYPE,
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FILE_PIPE_BYTE_STREAM_MODE,
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FILE_PIPE_QUEUE_OPERATION,
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1,
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nSize,
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nSize,
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(PLARGE_INTEGER) &Timeout
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);
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if (!NT_SUCCESS( Status )) {
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BaseSetLastNTError( Status );
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return( FALSE );
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}
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Status = NtOpenFile( &WritePipeHandle,
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GENERIC_WRITE | SYNCHRONIZE,
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&ObjectAttributes,
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&Iosb,
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FILE_SHARE_READ | FILE_SHARE_WRITE,
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FILE_SYNCHRONOUS_IO_NONALERT | FILE_NON_DIRECTORY_FILE
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);
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if (!NT_SUCCESS( Status )) {
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NtClose( ReadPipeHandle );
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BaseSetLastNTError( Status );
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return( FALSE );
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}
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*lpReadPipe = ReadPipeHandle;
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*lpWritePipe = WritePipeHandle;
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return( TRUE );
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}
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