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redir.cpp
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redir.cpp
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#include <windows.h>
#include <fcntl.h>
#include <errno.h>
#include "pipe.h"
#include "ChildData.h"
#include <sys/stat.h>
#define STDIN (0)
#define STDOUT (1)
#define STDERR (2)
// low-level io
typedef struct _FD_STRUCT {
Pipe* pipe; // if non-NULL, use this instead of hFile
unsigned char pipeChannel; // fd2 of RedirArg for pipe
HANDLE hFile;
BOOL binary;
BOOL eof;
} _FD_STRUCT;
#define FD_MAX (2048)
#define FD_BLOCK_SIZE (32) /* changing this will screw up "in_use" code below */
#define FD_MAX_BLOCKS (FD_MAX/FD_BLOCK_SIZE)
typedef struct _FD_BLOCK {
unsigned long in_use; // bitmask of in-use entries, LSB=fds[0], MSB=fds[31]
_FD_STRUCT fds[FD_BLOCK_SIZE]; // fd's
} _FD_BLOCK;
_FD_BLOCK _fd_block0 = {
0x00000007, // first three in use (reserved)
{
{ NULL, 0xff, INVALID_HANDLE_VALUE, FALSE, FALSE },
{ NULL, 0xff, INVALID_HANDLE_VALUE, FALSE, FALSE },
{ NULL, 0xff, INVALID_HANDLE_VALUE, FALSE, FALSE }
}
};
_FD_BLOCK* _fd_blocks[FD_MAX_BLOCKS] = { &_fd_block0 };
typedef struct _FILE_BLOCK _FILE_BLOCK;
typedef struct _FILE {
int file_index;
int fd;
int bufferedChar;
BOOL error;
} _FILE;
#define FILE_MAX (512)
#define FILE_BLOCK_SIZE (32) /* changing this will screw up "in_use" code below */
#define FILE_MAX_BLOCKS (FILE_MAX/FILE_BLOCK_SIZE)
typedef struct _FILE_BLOCK {
unsigned long in_use; // bitmask of in-use entries, LSB=file[0], MSB=file[31]
_FILE files[FILE_BLOCK_SIZE]; // file's
} _FILE_BLOCK;
_FILE_BLOCK _file_block0 = {
0x00000007, // first three in use (reserved)
{
{ 0, STDIN, -1 },
{ 1, STDOUT, -1 },
{ 2, STDERR, -1 },
// maybe there should get initialised at runtime, but that means re-initialising uneccesarily on each use
{ 3 },
{ 4 },
{ 5 },
{ 6 },
{ 7 },
{ 8 },
{ 9 },
{ 10 },
{ 11 },
{ 12 },
{ 13 },
{ 14 },
{ 15 },
{ 16 },
{ 17 },
{ 18 },
{ 19 },
{ 20 },
{ 21 },
{ 22 },
{ 23 },
{ 24 },
{ 25 },
{ 26 },
{ 27 },
{ 28 },
{ 29 },
{ 30 },
{ 31 }
}
};
_FILE_BLOCK* _file_blocks[FILE_MAX_BLOCKS] = { &_file_block0 };
#define fd_stdin (&_fd_block0.fds[0])
#define fd_stdout (&_fd_block0.fds[1])
#define fd_stderr (&_fd_block0.fds[2])
inline bool valid_fd(int fd)
{
if (fd < FD_BLOCK_SIZE)
return (_fd_block0.in_use & (1 << fd)) == 0 ? false : true;
else
{
int block = fd / FD_BLOCK_SIZE;
if (_fd_blocks[block] == NULL)
return false;
int index = fd % FD_BLOCK_SIZE;
return (_fd_blocks[block]->in_use & (1 << index)) == 0 ? false : true;
}
}
static ChildData* g_childData = NULL;
inline _FD_STRUCT* fds_from_index(int fd)
{
if (fd < FD_BLOCK_SIZE)
return &_fd_block0.fds[fd];
else
{
int block = fd / FD_BLOCK_SIZE;
if (_fd_blocks[block] == NULL)
return NULL;
int index = fd % FD_BLOCK_SIZE;
return &_fd_blocks[block]->fds[index];
}
}
static bool _wopen_fds(const WCHAR* filename, int flags, int mode, _FD_STRUCT* fds)
{
bool result = false;
bool share_read = false;
DWORD dwDesiredAccess = 0;
DWORD dwShareMode = 0;
DWORD dwCreationDisposition = 0;
DWORD dwFlagsAndAttributes = FILE_ATTRIBUTE_NORMAL;
HANDLE hFile = INVALID_HANDLE_VALUE;
if (filename == NULL || fds == NULL)
return NULL;
if ((flags & O_BINARY) && (flags & O_TEXT))
goto cleanup;
if (!(flags & O_WRONLY))
{
share_read = true;
dwDesiredAccess |= GENERIC_READ;
}
if ((flags & O_WRONLY) || (flags & O_RDWR))
{
share_read = false;
dwDesiredAccess |= GENERIC_WRITE;
}
if (share_read)
dwShareMode |= FILE_SHARE_READ;
if (flags & O_CREAT)
{
if (flags & O_TRUNC)
dwCreationDisposition = CREATE_ALWAYS;
else if (flags & O_EXCL)
dwCreationDisposition = CREATE_NEW;
else
dwCreationDisposition = OPEN_ALWAYS;
}
else if (flags & O_TRUNC)
dwCreationDisposition = TRUNCATE_EXISTING;
else
dwCreationDisposition = OPEN_EXISTING;
if ((flags & O_CREAT) && !(mode & S_IWRITE))
dwFlagsAndAttributes = FILE_ATTRIBUTE_READONLY;
hFile = CreateFile(filename, dwDesiredAccess, dwShareMode,
NULL, dwCreationDisposition, dwFlagsAndAttributes, NULL);
if (hFile == INVALID_HANDLE_VALUE)
goto cleanup;
if (flags & O_APPEND)
{
if (SetFilePointer(hFile, 0, NULL, FILE_END) == 0xFFFFFFFF)
goto cleanup;
}
fds->pipe = NULL;
fds->pipeChannel = 0xff;
fds->hFile = hFile;
fds->binary = (flags & O_BINARY);
fds->eof = FALSE;
result = true;
cleanup:
// close file on failure
if (!result && hFile != INVALID_HANDLE_VALUE)
CloseHandle(hFile);
return result;
}
inline bool valid_file(int file_index)
{
if (file_index < FILE_BLOCK_SIZE)
return (_file_block0.in_use & (1 << file_index)) == 0 ? false : true;
else
{
int block = file_index / FILE_BLOCK_SIZE;
if (_file_blocks[block] == NULL)
return false;
int index = file_index % FILE_BLOCK_SIZE;
return (_file_blocks[block]->in_use & (1 << index)) == 0 ? false : true;
}
}
static void fd_release(int fd)
{
// mask as not in use
int block = fd / FD_BLOCK_SIZE;
int index = fd % FD_BLOCK_SIZE;
unsigned long index_bit = 1 << index;
_fd_blocks[block]->in_use &= ~index_bit;
}
static _FILE* file_allocate()
{
for (int block=0; block<FILE_MAX_BLOCKS; block++)
{
if (_file_blocks[block] == NULL)
{ // unused block, allocate it
_file_blocks[block] = (_FILE_BLOCK*)malloc(sizeof(_FILE_BLOCK));
if (_file_blocks[block] == NULL)
return NULL;
// we'll use the first index
_file_blocks[block]->in_use = 0x00000001;
// set all file_index's
for (int index=0; index<FILE_BLOCK_SIZE; index++)
_file_blocks[block]->files[index].file_index = block*FILE_BLOCK_SIZE + index;
// return file at first index
return &_file_blocks[block]->files[0];
}
if (_file_blocks[block]->in_use != 0xffffffff)
{ // there's an unused entry in this block, find it
int index;
unsigned long index_bit = 0x00000001;
for (index=0; index<FILE_BLOCK_SIZE; index++)
{
if ((_file_blocks[block]->in_use & index_bit) == 0)
break; // found it
index_bit <<= 1;
}
// mark it as in use and return it
_file_blocks[block]->in_use |= index_bit;
return &_file_blocks[block]->files[index];
}
}
// if we get here there are no free files
return NULL;
}
extern "C" int close(int fd)
{
bool result = false;
_FD_STRUCT* fds;
fds = fds_from_index(fd);
if (fds == NULL)
goto cleanup;
if (!CloseHandle(fds->hFile))
goto cleanup;
fd_release(fd);
result = true;
cleanup:
// InSAT
/* if (result == false)
errno = -1;*/
return result ? 0 : -1;
}
static bool initialisedStdHandles = false;
static void uninitStdHandles()
{
if (!initialisedStdHandles)
return;
if (g_childData != NULL)
{
delete g_childData;
g_childData = NULL;
}
if (valid_file(STDIN))
fclose(stdin);
if (valid_file(STDOUT))
fclose(stdout);
if (valid_file(STDERR))
fclose(stderr);
if (valid_fd(STDIN))
close(STDIN);
if (valid_fd(STDOUT))
close(STDOUT);
if (valid_fd(STDERR))
close(STDERR);
initialisedStdHandles = false;
}
static void shutdownIo()
{
// TODO: Flush and close all _FILE's and then _FD_STRUCT's.
// If we implement redirection of handles through other handles then we
// probably need to shutdown all of the redirecting handles first, and
// then the remaining handles.
uninitStdHandles();
}
// returns true only if pipes have been initialised successfully
bool initStdHandles()
{
if (initialisedStdHandles)
return true;
#if 0
// Get I/O redirection arguments from command-line
char* stdoutFilename;
char* stderrFilename;
char* stdinFilename;
BOOL stdoutAppend;
BOOL stderrAppend;
BOOL stdinAppend;
if (getRedirArgs(GetCommandLine(),
&stdinFilename, &stdoutFilename, &stderrFilename, &stdinAppend, &stdoutAppend, &stderrAppend))
{
}
#endif
TCHAR name[100];
HANDLE hFileMapping = NULL;
unsigned char* pBuffer = NULL;
_stprintf(name, TEXT("wcecompat.%08x.child_data"), GetCurrentProcessId());
hFileMapping = CreateFileMapping((HANDLE)INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, 1, name);
if (hFileMapping == NULL)
goto cleanup;
else if (GetLastError() != ERROR_ALREADY_EXISTS)
{
CloseHandle(hFileMapping);
hFileMapping = NULL;
HANDLE hEvent = CreateEvent(NULL, FALSE, FALSE, TEXT("wcecompat.starting_child"));
if (hEvent == NULL)
{ // failed to create named event
}
else if (GetLastError() == ERROR_ALREADY_EXISTS)
{ // we're in DllMain, so do nothing
}
else
{
CloseHandle(hEvent);
}
}
else
{
pBuffer = (unsigned char*)MapViewOfFile(hFileMapping, FILE_MAP_WRITE, 0, 0, 0);
if (pBuffer == NULL)
{ // failed to map buffer
}
else
{
g_childData = new ChildData;
if (g_childData == NULL)
goto cleanup;
if (!g_childData->decode(pBuffer))//, 16384);
goto cleanup;
g_childData->restoreEnvironment();
RedirArg* stdinRedir = g_childData->getRedirArg(0);
RedirArg* stdoutRedir = g_childData->getRedirArg(1);
RedirArg* stderrRedir = g_childData->getRedirArg(2);
if (stdinRedir != NULL && stdinRedir->redirType != RT_NONE)
{
if (stdinRedir->redirType == RT_PIPE_UNSPEC)
{
_FD_STRUCT* fds = fds_from_index(STDIN);
if (fds == NULL)
goto cleanup;
fds->pipe = createPipe(stdinRedir->filename, OPEN_EXISTING);
if (fds->pipe == NULL)
{ // failed to open stdin pipe
goto cleanup;
}
fds->pipeChannel = (unsigned char)stdinRedir->fd2;
}
else if (stdinRedir->redirType == RT_HANDLE)
{
}
else if (stdinRedir->redirType == RT_FILE)
{
// WCHAR* mode = L"r"; // default to "r" for the cases we don't know how to handle
bool r = stdinRedir->openForRead;
bool w = stdinRedir->openForWrite;
bool a = stdinRedir->append;
/*
// rwa mode
// 010 "w"
// 011 "a"
// 100 "r"
// 110 "r+"
// 111 "a+"
if (a)
{
if (r)
mode = L"a+";
else
mode = L"a";
}
else if (r)
{
if (w)
mode = L"r+";
else
mode = L"r";
}
else if (w)
mode = L"w";
FILE* f = _wfopen(stdinRedir->filename, mode);
if (f == NULL)
goto cleanup;
memcpy(&mystdin, f, sizeof(_FD_STRUCT));
free(f);
*/
// rwa mode
// 010 "w" w, CREATE_ALWAYS O_WRONLY O_CREAT|O_TRUNC
// 011 "a" w, OPEN_ALWAYS (APPEND DATA) O_WRONLY O_APPEND O_CREAT
// 100 "r" r, OPEN_EXISTING O_RDONLY
// 110 "r+" r/w, OPEN_EXISTING O_RDWR
// 111 "a+" r/w, OPEN_ALWAYS (APPEND DATA) O_RDWR O_APPEND O_CREAT
int flags = 0;
int mode = 0;
if (r && w)
flags |= O_RDWR;
else if (r)
flags |= O_RDONLY;
else if (w)
flags |= O_WRONLY;
if (w)
{
if (!(r && !a))
{
flags |= O_CREAT;
mode = S_IREAD | S_IWRITE;
}
if (!r && !a)
flags |= O_TRUNC;
}
if (a)
flags |= O_APPEND;
_FD_STRUCT* fds = fds_from_index(STDIN);
if (fds == NULL)
goto cleanup;
if (!_wopen_fds(stdinRedir->filename, flags, mode, fds))
goto cleanup;
}
}
if (stdoutRedir != NULL && stdoutRedir->redirType != RT_NONE)
{
if (stdoutRedir->redirType == RT_PIPE_UNSPEC)
{
_FD_STRUCT* fds = fds_from_index(STDOUT);
if (fds == NULL)
goto cleanup;
fds->pipe = createPipe(stdoutRedir->filename, OPEN_EXISTING);
if (fds->pipe == NULL)
{ // failed to open stdout pipe
goto cleanup;
}
fds->pipeChannel = (unsigned char)stdoutRedir->fd2;
}
else if (stdoutRedir->redirType == RT_HANDLE)
{
}
else if (stdoutRedir->redirType == RT_FILE)
{
// WCHAR* mode = L"r"; // default to "r" for the cases we don't know how to handle
bool r = stdoutRedir->openForRead;
bool w = stdoutRedir->openForWrite;
bool a = stdoutRedir->append;
/*
// rwa mode
// 010 "w"
// 011 "a"
// 100 "r"
// 110 "r+"
// 111 "a+"
if (a)
{
if (r)
mode = L"a+";
else
mode = L"a";
}
else if (r)
{
if (w)
mode = L"r+";
else
mode = L"r";
}
else if (w)
mode = L"w";
FILE* f = _wfopen(stdoutRedir->filename, mode);
if (f == NULL)
goto cleanup;
memcpy(&mystdout, f, sizeof(_FD_STRUCT));
free(f);
*/
// rwa mode
// 010 "w" w, CREATE_ALWAYS O_WRONLY O_CREAT|O_TRUNC
// 011 "a" w, OPEN_ALWAYS (APPEND DATA) O_WRONLY O_APPEND O_CREAT
// 100 "r" r, OPEN_EXISTING O_RDONLY
// 110 "r+" r/w, OPEN_EXISTING O_RDWR
// 111 "a+" r/w, OPEN_ALWAYS (APPEND DATA) O_RDWR O_APPEND O_CREAT
int flags = 0;
int mode = 0;
if (r && w)
flags |= O_RDWR;
else if (r)
flags |= O_RDONLY;
else if (w)
flags |= O_WRONLY;
if (w)
{
if (!(r && !a))
{
flags |= O_CREAT;
mode = S_IREAD | S_IWRITE;
}
if (!r && !a)
flags |= O_TRUNC;
}
if (a)
flags |= O_APPEND;
_FD_STRUCT* fds = fds_from_index(STDOUT);
if (fds == NULL)
goto cleanup;
if (!_wopen_fds(stdoutRedir->filename, flags, mode, fds))
goto cleanup;
}
}
if (stderrRedir != NULL && stderrRedir->redirType != RT_NONE)
{
if (stderrRedir->redirType == RT_PIPE_UNSPEC)
{
_FD_STRUCT* fds = fds_from_index(STDERR);
if (fds == NULL)
goto cleanup;
if (stdoutRedir != NULL && stdoutRedir->redirType == RT_PIPE_UNSPEC &&
wcscmp(stderrRedir->filename, stdoutRedir->filename) == 0)
{
_FD_STRUCT* fds_stdout = fds_from_index(STDOUT);
if (fds_stdout == NULL)
goto cleanup;
fds->pipe = fds_stdout->pipe;
}
else
{
fds->pipe = createPipe(stderrRedir->filename, OPEN_EXISTING);
if (fds->pipe == NULL)
{ // failed to open stderr pipe
goto cleanup;
}
}
fds->pipeChannel = (unsigned char)stderrRedir->fd2;
}
else if (stderrRedir->redirType == RT_HANDLE)
{
}
else if (stderrRedir->redirType == RT_FILE)
{
// WCHAR* mode = L"r"; // default to "r" for the cases we don't know how to handle
bool r = stderrRedir->openForRead;
bool w = stderrRedir->openForWrite;
bool a = stderrRedir->append;
/*
// rwa mode
// 010 "w"
// 011 "a"
// 100 "r"
// 110 "r+"
// 111 "a+"
if (a)
{
if (r)
mode = L"a+";
else
mode = L"a";
}
else if (r)
{
if (w)
mode = L"r+";
else
mode = L"r";
}
else if (w)
mode = L"w";
FILE* f = _wfopen(stderrRedir->filename, mode);
if (f == NULL)
goto cleanup;
memcpy(&mystderr, f, sizeof(_FD_STRUCT));
free(f);
*/
// rwa mode
// 010 "w" w, CREATE_ALWAYS O_WRONLY O_CREAT|O_TRUNC
// 011 "a" w, OPEN_ALWAYS (APPEND DATA) O_WRONLY O_APPEND O_CREAT
// 100 "r" r, OPEN_EXISTING O_RDONLY
// 110 "r+" r/w, OPEN_EXISTING O_RDWR
// 111 "a+" r/w, OPEN_ALWAYS (APPEND DATA) O_RDWR O_APPEND O_CREAT
int flags = 0;
int mode = 0;
if (r && w)
flags |= O_RDWR;
else if (r)
flags |= O_RDONLY;
else if (w)
flags |= O_WRONLY;
if (w)
{
if (!(r && !a))
{
flags |= O_CREAT;
mode = S_IREAD | S_IWRITE;
}
if (!r && !a)
flags |= O_TRUNC;
}
if (a)
flags |= O_APPEND;
_FD_STRUCT* fds = fds_from_index(STDERR);
if (fds == NULL)
goto cleanup;
if (!_wopen_fds(stderrRedir->filename, flags, mode, fds))
goto cleanup;
}
}
}
}
initialisedStdHandles = true;
atexit(shutdownIo);
cleanup:
if (!initialisedStdHandles)
uninitStdHandles();
if (pBuffer != NULL)
UnmapViewOfFile(pBuffer);
if (hFileMapping != NULL)
CloseHandle(hFileMapping);
return initialisedStdHandles;
}
static inline bool initStdHandlesInline()
{
if (initialisedStdHandles)
return true;
return initStdHandles();
}
extern "C" int kbhit(void)
{
if (!valid_fd(STDIN))
{
printf("valid_fd\n\r");
if (!initStdHandlesInline())
{
printf("initStdHandlesInline\n\r");
return 0;
}
if (!valid_fd(STDIN))
{
printf("valid_fd 2\n\r");
return 0;
}
}
// printf("fd_stdin->pipe %d\n\r",fd_stdin->pipe);
if (fd_stdin->pipe != NULL)
{
printf("pipeReadable(fd_stdin->pipe) %d\n\r",pipeReadable(fd_stdin->pipe));
return pipeReadable(fd_stdin->pipe) ? 1 : 0;
}
else
return 0;
}