static int uv__duplicate_fd(uv_loop_t* loop, int fd, HANDLE* dup) {
HANDLE handle;
if (fd == -1) {
*dup = INVALID_HANDLE_VALUE;
return ERROR_INVALID_HANDLE;
}
handle = uv__get_osfhandle(fd);
return uv__duplicate_handle(loop, handle, dup);
}
static int uv__duplicate_fd(uv_loop_t* loop, int fd, HANDLE* dup) {
HANDLE handle;
if (fd == -1) {
*dup = INVALID_HANDLE_VALUE;
uv__set_artificial_error(loop, UV_EBADF);
return -1;
}
handle = (HANDLE)_get_osfhandle(fd);
return uv__duplicate_handle(loop, handle, dup);
}
int uv__stdio_create(uv_loop_t* loop, uv_process_options_t* options,
BYTE** buffer_ptr) {
BYTE* buffer;
int count, i;
count = options->stdio_count;
if (count < 0 || count > 255) {
/* Only support FDs 0-255 */
uv__set_artificial_error(loop, UV_ENOTSUP);
return -1;
} else if (count < 3) {
/* There should always be at least 3 stdio handles. */
count = 3;
}
/* Allocate the child stdio buffer */
buffer = malloc(CHILD_STDIO_SIZE(count));
if (buffer == NULL) {
uv__set_artificial_error(loop, UV_ENOMEM);
return -1;
}
/* Prepopulate the buffer with INVALID_HANDLE_VALUE handles so we can */
/* clean up on failure. */
CHILD_STDIO_COUNT(buffer) = count;
for (i = 0; i < count; i++) {
CHILD_STDIO_CRT_FLAGS(buffer, i) = 0;
CHILD_STDIO_HANDLE(buffer, i) = INVALID_HANDLE_VALUE;
}
for (i = 0; i < count; i++) {
uv_stdio_container_t fdopt;
if (i < options->stdio_count) {
fdopt = options->stdio[i];
} else {
fdopt.flags = UV_IGNORE;
}
switch (fdopt.flags & (UV_IGNORE | UV_CREATE_PIPE | UV_INHERIT_FD |
UV_INHERIT_STREAM)) {
case UV_IGNORE:
/* Starting a process with no stdin/stout/stderr can confuse it. */
/* So no matter what the user specified, we make sure the first */
/* three FDs are always open in their typical modes, e.g. stdin */
/* be readable and stdout/err should be writable. For FDs > 2, don't */
/* do anything - all handles in the stdio buffer are initialized with */
/* INVALID_HANDLE_VALUE, which should be okay. */
if (i <= 2) {
DWORD access = (i == 0) ? FILE_GENERIC_READ :
FILE_GENERIC_WRITE | FILE_READ_ATTRIBUTES;
if (uv__create_nul_handle(loop,
&CHILD_STDIO_HANDLE(buffer, i),
access) < 0) {
goto error;
}
CHILD_STDIO_CRT_FLAGS(buffer, i) = FOPEN | FDEV;
}
break;
case UV_CREATE_PIPE: {
/* Create a pair of two connected pipe ends; one end is turned into */
/* an uv_pipe_t for use by the parent. The other one is given to */
/* the child. */
uv_pipe_t* parent_pipe = (uv_pipe_t*) fdopt.data.stream;
HANDLE child_pipe;
/* Create a new, connected pipe pair. stdio[i].stream should point */
/* to an uninitialized, but not connected pipe handle. */
assert(fdopt.data.stream->type == UV_NAMED_PIPE);
assert(!(fdopt.data.stream->flags & UV_HANDLE_CONNECTION));
assert(!(fdopt.data.stream->flags & UV_HANDLE_PIPESERVER));
if (uv__create_stdio_pipe_pair(loop,
parent_pipe,
&child_pipe,
fdopt.flags) < 0) {
goto error;
}
CHILD_STDIO_HANDLE(buffer, i) = child_pipe;
CHILD_STDIO_CRT_FLAGS(buffer, i) = FOPEN | FPIPE;
break;
}
case UV_INHERIT_FD: {
/* Inherit a raw FD. */
HANDLE child_handle;
/* Make an inheritable duplicate of the handle. */
if (uv__duplicate_fd(loop, fdopt.data.fd, &child_handle) < 0) {
goto error;
}
/* Figure out what the type is. */
switch (GetFileType(child_handle)) {
case FILE_TYPE_DISK:
CHILD_STDIO_CRT_FLAGS(buffer, i) = FOPEN;
break;
case FILE_TYPE_PIPE:
CHILD_STDIO_CRT_FLAGS(buffer, i) = FOPEN | FPIPE;
case FILE_TYPE_CHAR:
case FILE_TYPE_REMOTE:
CHILD_STDIO_CRT_FLAGS(buffer, i) = FOPEN | FDEV;
break;
case FILE_TYPE_UNKNOWN:
if (GetLastError != 0) {
uv__set_sys_error(loop, GetLastError());
CloseHandle(child_handle);
goto error;
}
CHILD_STDIO_CRT_FLAGS(buffer, i) = FOPEN | FDEV;
break;
default:
assert(0);
}
CHILD_STDIO_HANDLE(buffer, i) = child_handle;
break;
}
case UV_INHERIT_STREAM: {
/* Use an existing stream as the stdio handle for the child. */
HANDLE stream_handle, child_handle;
unsigned char crt_flags;
uv_stream_t* stream = fdopt.data.stream;
/* Leech the handle out of the stream. */
if (stream->type == UV_TTY) {
stream_handle = ((uv_tty_t*) stream)->handle;
crt_flags = FOPEN | FDEV;
} else if (stream->type == UV_NAMED_PIPE &&
stream->flags & UV_HANDLE_CONNECTED) {
stream_handle = ((uv_pipe_t*) stream)->handle;
crt_flags = FOPEN | FPIPE;
} else {
stream_handle = INVALID_HANDLE_VALUE;
crt_flags = 0;
}
if (stream_handle == NULL ||
stream_handle == INVALID_HANDLE_VALUE) {
/* The handle is already closed, or not yet created, or the */
/* stream type is not supported. */
uv__set_artificial_error(loop, UV_ENOTSUP);
goto error;
}
/* Make an inheritable copy of the handle. */
if (uv__duplicate_handle(loop,
stream_handle,
&child_handle) < 0) {
goto error;
}
CHILD_STDIO_HANDLE(buffer, i) = child_handle;
CHILD_STDIO_CRT_FLAGS(buffer, i) = crt_flags;
break;
}
default:
assert(0);
}
}
*buffer_ptr = buffer;
return 0;
error:
uv__stdio_destroy(buffer);
return -1;
}