projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) | |
| 3 | * Licensed under the GPL | |
| 4 | */ | |
| 5 | ||
| 6 | #include <stdlib.h> | |
| 7 | #include <errno.h> | |
| 8 | #include "chan_user.h" | |
| 9 | #include "os.h" | |
| 10 | ||
| 11 | static int null_chan; | |
| 12 | ||
| 13 | static void *null_init(char *str, int device, struct chan_opts *opts) | |
| 14 | { | |
| 15 | return(&null_chan); | |
| 16 | } | |
| 17 | ||
| 18 | static int null_open(int input, int output, int primary, void *d, | |
| 19 | char **dev_out) | |
| 20 | { | |
| 21 | *dev_out = NULL; | |
| 22 | return(os_open_file(DEV_NULL, of_rdwr(OPENFLAGS()), 0)); | |
| 23 | } | |
| 24 | ||
| 25 | static int null_read(int fd, char *c_out, void *unused) | |
| 26 | { | |
| 27 | return(-ENODEV); | |
| 28 | } | |
| 29 | ||
| 30 | static void null_free(void *data) | |
| 31 | { | |
| 32 | } | |
| 33 | ||
| 34 | struct chan_ops null_ops = { | |
| 35 | .type = "null", | |
| 36 | .init = null_init, | |
| 37 | .open = null_open, | |
| 38 | .close = generic_close, | |
| 39 | .read = null_read, | |
| 40 | .write = generic_write, | |
| 41 | .console_write = generic_console_write, | |
| 42 | .window_size = generic_window_size, | |
| 43 | .free = null_free, | |
| 44 | .winch = 0, | |
| 45 | }; | |
| 46 | ||
| 47 | /* | |
| 48 | * Overrides for Emacs so that we follow Linus's tabbing style. | |
| 49 | * Emacs will notice this stuff at the end of the file and automatically | |
| 50 | * adjust the settings for this buffer only. This must remain at the end | |
| 51 | * of the file. | |
| 52 | * --------------------------------------------------------------------------- | |
| 53 | * Local variables: | |
| 54 | * c-file-style: "linux" | |
| 55 | * End: | |
| 56 | */ |