/*
* Used for initializing stdio streams like options.stdin_stream. Returns
* zero on success. See also the cleanup section in uv_spawn().
*/
static int uv__process_init_stdio(uv_stdio_container_t* container, int fds[2]) {
int mask;
int fd;
mask = UV_IGNORE | UV_CREATE_PIPE | UV_INHERIT_FD | UV_INHERIT_STREAM;
switch (container->flags & mask) {
case UV_IGNORE:
return 0;
case UV_CREATE_PIPE:
assert(container->data.stream != NULL);
if (container->data.stream->type != UV_NAMED_PIPE)
return -EINVAL;
else
return uv__make_socketpair(fds, 0);
case UV_INHERIT_FD:
case UV_INHERIT_STREAM:
if (container->flags & UV_INHERIT_FD)
fd = container->data.fd;
else
fd = uv__stream_fd(container->data.stream);
if (fd == -1)
return -EINVAL;
fds[1] = fd;
return 0;
default:
assert(0 && "Unexpected flags");
return -EINVAL;
}
}
/*
* Used for initializing stdio streams like options.stdin_stream. Returns
* zero on success.
*/
static int uv__process_init_pipe(uv_pipe_t* handle, int fds[2], int flags) {
if (handle->type != UV_NAMED_PIPE) {
errno = EINVAL;
return -1;
}
if (handle->ipc)
return uv__make_socketpair(fds, flags);
else
return uv__make_pipe(fds, flags);
}
/*
* Used for initializing stdio streams like options.stdin_stream. Returns
* zero on success.
*/
static int uv__process_init_stdio(uv_stdio_container_t* container, int fds[2],
int writable) {
int fd = -1;
switch (container->flags & (UV_IGNORE | UV_CREATE_PIPE | UV_INHERIT_FD |
UV_INHERIT_STREAM | UV_NATIVE_PIPE)) {
case UV_IGNORE:
return 0;
case UV_CREATE_PIPE:
assert(container->data.stream != NULL);
if (container->data.stream->type != UV_NAMED_PIPE) {
errno = EINVAL;
return -1;
}
return uv__make_socketpair(fds, 0);
case UV_NATIVE_PIPE:
assert(container->data.stream != NULL);
if(uv__make_pipe(*(int**)container->data.pipe, 0) == -1)
return -1;
if (writable)
fds[1] = container->data.pipe->write;
else
fds[0] = container->data.pipe->read;
return 0;
case UV_INHERIT_FD:
case UV_INHERIT_STREAM:
if (container->flags & UV_INHERIT_FD) {
fd = container->data.fd;
} else {
fd = container->data.stream->fd;
}
if (fd == -1) {
errno = EINVAL;
return -1;
}
fds[writable ? 1 : 0] = fd;
return 0;
default:
assert(0 && "Unexpected flags");
return -1;
}
}
uv_err_t uv_pipe_pair(uv_pipe_t* a, uv_pipe_t* b) {
int fds[2];
int r;
uv_err_t err;
/* Make sure that the mutex is only initialized once. */
uv_once(&uv__pipe_pair_lock_guard, uv__pipe_pair_lock_init);
uv_mutex_lock(&uv__pipe_pair_lock);
r = uv__make_socketpair(fds, UV__F_NONBLOCK | UV__F_IPC);
if (r) {
err = uv__new_sys_error(errno);
} else {
uv_pipe_open(a, fds[0]);
uv_pipe_open(b, fds[1]);
err = uv_ok_;
}
uv_mutex_unlock(&uv__pipe_pair_lock);
return err;
}
