mirror of https://gitee.com/openkylin/linux.git
57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
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/*
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* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include <stdlib.h>
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#include <errno.h>
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#include "chan_user.h"
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#include "os.h"
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static int null_chan;
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static void *null_init(char *str, int device, struct chan_opts *opts)
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{
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return(&null_chan);
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}
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static int null_open(int input, int output, int primary, void *d,
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char **dev_out)
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{
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*dev_out = NULL;
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return(os_open_file(DEV_NULL, of_rdwr(OPENFLAGS()), 0));
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}
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static int null_read(int fd, char *c_out, void *unused)
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{
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return(-ENODEV);
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}
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static void null_free(void *data)
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{
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}
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struct chan_ops null_ops = {
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.type = "null",
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.init = null_init,
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.open = null_open,
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.close = generic_close,
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.read = null_read,
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.write = generic_write,
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.console_write = generic_console_write,
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.window_size = generic_window_size,
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.free = null_free,
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.winch = 0,
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};
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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