arch/um/drivers/pty.c

   1 /*
   2  * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include <stdio.h>
   7 #include <unistd.h>
   8 #include <string.h>
   9 #include <errno.h>
  10 #include <termios.h>
  11 #include "chan_user.h"
  12 #include "user.h"
  13 #include "user_util.h"
  14 #include "kern_util.h"
  15 #include "os.h"
  16
  17 struct pty_chan {
  18         void (*announce)(char *dev_name, int dev);
  19         int dev;
  20         int raw;
  21         struct termios tt;
  22         char dev_name[sizeof("/dev/pts/0123456\0")];
  23 };
  24
  25 void *pty_chan_init(char *str, int device, struct chan_opts *opts)
  26 {
  27         struct pty_chan *data;
  28
  29         data = um_kmalloc(sizeof(*data));
  30         if(data == NULL) return(NULL);
  31         *data = ((struct pty_chan) { .announce          = opts->announce,
  32                                      .dev               = device,
  33                                      .raw               = opts->raw });
  34         return(data);
  35 }
  36
  37 int pts_open(int input, int output, int primary, void *d, char **dev_out)
  38 {
  39         struct pty_chan *data = d;
  40         char *dev;
  41         int fd;
  42
  43         fd = get_pty();
  44         if(fd < 0){
  45                 printk("open_pts : Failed to open pts\n");
  46                 return(-errno);
  47         }
  48         if(data->raw){
  49                 tcgetattr(fd, &data->tt);
  50                 raw(fd, 0);
  51         }
  52
  53         dev = ptsname(fd);
  54         sprintf(data->dev_name, "%s", dev);
  55         *dev_out = data->dev_name;
  56         if(data->announce) (*data->announce)(dev, data->dev);
  57         return(fd);
  58 }
  59
  60 int getmaster(char *line)
  61 {
  62         char *pty, *bank, *cp;
  63         int master, err;
  64
  65         pty = &line[strlen("/dev/ptyp")];
  66         for (bank = "pqrs"; *bank; bank++) {
  67                 line[strlen("/dev/pty")] = *bank;
  68                 *pty = '0';
  69                 if (os_stat_file(line, NULL) < 0)
  70                         break;
  71                 for (cp = "0123456789abcdef"; *cp; cp++) {
  72                         *pty = *cp;
  73                         master = os_open_file(line, of_rdwr(OPENFLAGS()), 0);
  74                         if (master >= 0) {
  75                                 char *tp = &line[strlen("/dev/")];
  76
  77                                 /* verify slave side is usable */
  78                                 *tp = 't';
  79                                 err = os_access(line, OS_ACC_RW_OK);
  80                                 *tp = 'p';
  81                                 if(err == 0) return(master);
  82                                 (void) os_close_file(master);
  83                         }
  84                 }
  85         }
  86         return(-1);
  87 }
  88
  89 int pty_open(int input, int output, int primary, void *d, char **dev_out)
  90 {
  91         struct pty_chan *data = d;
  92         int fd;
  93         char dev[sizeof("/dev/ptyxx\0")] = "/dev/ptyxx";
  94
  95         fd = getmaster(dev);
  96         if(fd < 0) return(-errno);
  97
  98         if(data->raw) raw(fd, 0);
  99         if(data->announce) (*data->announce)(dev, data->dev);
 100
 101         sprintf(data->dev_name, "%s", dev);
 102         *dev_out = data->dev_name;
 103         return(fd);
 104 }
 105
 106 int pty_console_write(int fd, const char *buf, int n, void *d)
 107 {
 108         struct pty_chan *data = d;
 109
 110         return(generic_console_write(fd, buf, n, &data->tt));
 111 }
 112
 113 struct chan_ops pty_ops = {
 114         .type           = "pty",
 115         .init           = pty_chan_init,
 116         .open           = pty_open,
 117         .close          = generic_close,
 118         .read           = generic_read,
 119         .write          = generic_write,
 120         .console_write  = pty_console_write,
 121         .window_size    = generic_window_size,
 122         .free           = generic_free,
 123         .winch          = 0,
 124 };
 125
 126 struct chan_ops pts_ops = {
 127         .type           = "pts",
 128         .init           = pty_chan_init,
 129         .open           = pts_open,
 130         .close          = generic_close,
 131         .read           = generic_read,
 132         .write          = generic_write,
 133         .console_write  = pty_console_write,
 134         .window_size    = generic_window_size,
 135         .free           = generic_free,
 136         .winch          = 0,
 137 };
 138
 139 /*
 140  * Overrides for Emacs so that we follow Linus's tabbing style.
 141  * Emacs will notice this stuff at the end of the file and automatically
 142  * adjust the settings for this buffer only.  This must remain at the end
 143  * of the file.
 144  * ---------------------------------------------------------------------------
 145  * Local variables:
 146  * c-file-style: "linux"
 147  * End:
 148  */