/* * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com) * Licensed under the GPL */ #include <stddef.h> #include <errno.h> #include <fcntl.h> #include "chan_user.h" #include <os.h> /* This address is used only as a unique identifier */ static int null_chan; static void *null_init(char *str, int device, const struct chan_opts *opts) { return &null_chan; } static int null_open(int input, int output, int primary, void *d, char **dev_out) { int fd; *dev_out = NULL; fd = open(DEV_NULL, O_RDWR); return (fd < 0) ? -errno : fd; } static int null_read(int fd, char *c_out, void *unused) { return -ENODEV; } static void null_free(void *data) { } const struct chan_ops null_ops = { .type = "null", .init = null_init, .open = null_open, .close = generic_close, .read = null_read, .write = generic_write, .console_write = generic_console_write, .window_size = generic_window_size, .free = null_free, .winch = 0, };