163 lines
3.4 KiB
C
163 lines
3.4 KiB
C
/*
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* Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <termios.h>
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#include "chan_user.h"
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#include "user.h"
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#include "user_util.h"
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#include "kern_util.h"
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#include "os.h"
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struct pty_chan {
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void (*announce)(char *dev_name, int dev);
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int dev;
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int raw;
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struct termios tt;
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char dev_name[sizeof("/dev/pts/0123456\0")];
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};
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static void *pty_chan_init(char *str, int device, struct chan_opts *opts)
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{
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struct pty_chan *data;
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data = um_kmalloc(sizeof(*data));
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if(data == NULL) return(NULL);
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*data = ((struct pty_chan) { .announce = opts->announce,
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.dev = device,
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.raw = opts->raw });
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return(data);
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}
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static int pts_open(int input, int output, int primary, void *d,
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char **dev_out)
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{
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struct pty_chan *data = d;
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char *dev;
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int fd, err;
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fd = get_pty();
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if(fd < 0){
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printk("open_pts : Failed to open pts\n");
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return(-errno);
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}
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if(data->raw){
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CATCH_EINTR(err = tcgetattr(fd, &data->tt));
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if(err)
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return(err);
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err = raw(fd);
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if(err)
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return(err);
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}
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dev = ptsname(fd);
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sprintf(data->dev_name, "%s", dev);
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*dev_out = data->dev_name;
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if (data->announce)
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(*data->announce)(dev, data->dev);
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return(fd);
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}
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static int getmaster(char *line)
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{
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char *pty, *bank, *cp;
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int master, err;
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pty = &line[strlen("/dev/ptyp")];
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for (bank = "pqrs"; *bank; bank++) {
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line[strlen("/dev/pty")] = *bank;
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*pty = '0';
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if (os_stat_file(line, NULL) < 0)
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break;
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for (cp = "0123456789abcdef"; *cp; cp++) {
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*pty = *cp;
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master = os_open_file(line, of_rdwr(OPENFLAGS()), 0);
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if (master >= 0) {
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char *tp = &line[strlen("/dev/")];
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/* verify slave side is usable */
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*tp = 't';
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err = os_access(line, OS_ACC_RW_OK);
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*tp = 'p';
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if(err == 0) return(master);
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(void) os_close_file(master);
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}
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}
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}
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return(-1);
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}
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static int pty_open(int input, int output, int primary, void *d,
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char **dev_out)
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{
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struct pty_chan *data = d;
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int fd, err;
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char dev[sizeof("/dev/ptyxx\0")] = "/dev/ptyxx";
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fd = getmaster(dev);
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if(fd < 0)
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return(-errno);
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if(data->raw){
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err = raw(fd);
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if(err)
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return(err);
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}
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if(data->announce) (*data->announce)(dev, data->dev);
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sprintf(data->dev_name, "%s", dev);
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*dev_out = data->dev_name;
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return(fd);
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}
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static int pty_console_write(int fd, const char *buf, int n, void *d)
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{
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struct pty_chan *data = d;
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return(generic_console_write(fd, buf, n, &data->tt));
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}
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struct chan_ops pty_ops = {
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.type = "pty",
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.init = pty_chan_init,
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.open = pty_open,
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.close = generic_close,
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.read = generic_read,
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.write = generic_write,
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.console_write = pty_console_write,
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.window_size = generic_window_size,
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.free = generic_free,
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.winch = 0,
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};
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struct chan_ops pts_ops = {
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.type = "pts",
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.init = pty_chan_init,
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.open = pts_open,
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.close = generic_close,
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.read = generic_read,
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.write = generic_write,
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.console_write = pty_console_write,
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.window_size = generic_window_size,
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.free = generic_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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