fd.c 2.1 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6 7 8 9 10 11 12 13
/* 
 * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
 * Licensed under the GPL
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <termios.h>
#include <errno.h>
#include "user.h"
#include "user_util.h"
#include "chan_user.h"
14
#include "os.h"
L
Linus Torvalds 已提交
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86

struct fd_chan {
	int fd;
	int raw;
	struct termios tt;
	char str[sizeof("1234567890\0")];
};

static void *fd_init(char *str, int device, struct chan_opts *opts)
{
	struct fd_chan *data;
	char *end;
	int n;

	if(*str != ':'){
		printk("fd_init : channel type 'fd' must specify a file "
		       "descriptor\n");
		return(NULL);
	}
	str++;
	n = strtoul(str, &end, 0);
	if((*end != '\0') || (end == str)){
		printk("fd_init : couldn't parse file descriptor '%s'\n", str);
		return(NULL);
	}
	data = um_kmalloc(sizeof(*data));
	if(data == NULL) return(NULL);
	*data = ((struct fd_chan) { .fd  	= n,
				    .raw  	= opts->raw });
	return(data);
}

static int fd_open(int input, int output, int primary, void *d, char **dev_out)
{
	struct fd_chan *data = d;
	int err;

	if(data->raw && isatty(data->fd)){
		CATCH_EINTR(err = tcgetattr(data->fd, &data->tt));
		if(err)
			return(err);

		err = raw(data->fd);
		if(err)
			return(err);
	}
	sprintf(data->str, "%d", data->fd);
	*dev_out = data->str;
	return(data->fd);
}

static void fd_close(int fd, void *d)
{
	struct fd_chan *data = d;
	int err;

	if(data->raw && isatty(fd)){
		CATCH_EINTR(err = tcsetattr(fd, TCSAFLUSH, &data->tt));
		if(err)
			printk("Failed to restore terminal state - "
			       "errno = %d\n", -err);
		data->raw = 0;
	}
}

struct chan_ops fd_ops = {
	.type		= "fd",
	.init		= fd_init,
	.open		= fd_open,
	.close		= fd_close,
	.read		= generic_read,
	.write		= generic_write,
87
	.console_write	= generic_console_write,
L
Linus Torvalds 已提交
88 89 90 91 92 93 94 95 96 97 98 99 100 101 102
	.window_size	= generic_window_size,
	.free		= generic_free,
	.winch		= 1,
};

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * Emacs will notice this stuff at the end of the file and automatically
 * adjust the settings for this buffer only.  This must remain at the end
 * of the file.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-file-style: "linux"
 * End:
 */